What is Impulse: Definition and 929 Discussions

In the field of consumer behavior, an impulse purchase or impulse buying is an unplanned decision by a consumer to buy a product or service, made just before a purchase. One who tends to make such purchases is referred to as an impulse purchaser, impulse buyer, or compulsive buyer. Research findings suggest that emotions, feelings, and attitudes play a decisive role in purchasing, triggered by seeing the product or upon exposure to a well crafted promotional message.

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  1. I

    Collision: Final velocities of two particles, calculated from impulse

    Hi, I don't know if this is the right place to ask this.. As the title says, I want know the final velocities of two partcles after collision, but I want to get those from the impulse, not from the final velocities equations you see arround there... The final step would be that: Vf =...
  2. N

    HELP Impulse Response h(n) problem

    HELP! Impulse Response h(n) problem Please help me solve this problem. Atleast the correct answer indication is also very much appreciated. A system has impulse response h(n) = (1/2)^n-3 U(n-3) and the input is x(n) = 3^n U(n) a)Find the output by direct convolution. b)Find the output...
  3. M

    Finding the Post-Collision Velocity: Is My Calculation Correct?

    Homework Statement Daisy (65.0kg) skates on ice at 4.5m/s to greet her friend (75.0kg), who is standing still, with open arms. As they collide, while holding each other, with what speed do the both move off together? Homework Equations MaVa+MbVb / Ma+Mb The Attempt at a Solution...
  4. M

    Momentum & Impulse: Find Average Force in Elastic Collision

    Homework Statement A locomotive of mass 21x10^3kg traveling at 2.0m/s runs into an identical stationary locomotive. If the collision is perfectly elastic and lasts for 1.5s, find the average force exerted on the stationary locomotive during the collision. Homework Equations Find...
  5. O

    Solve Impulse Problem: Find Lowest Average Force

    Homework Statement Which of the following could be accomplished with the least average force? a: accelerating a 2 kg ball from 0 m/s to 9 m/s in half a second. b: accelerating a 6 kg ball from 0 m/s to 6 m/s in one second. c: accelerating a 9 kg ball from 0 m/s to 8 m/s in two seconds. d...
  6. A

    Is Impulse Conserved in Collisions?

    Conservation of Impulse? Homework Statement I know that momentum is conserved, but is impulse? Homework Equations Impulse = change in momentum The Attempt at a Solution I really have no idea. I would say it isn't conserved because it equals the changein momentum. But the two...
  7. H

    Dsp help - impulse response of system in z domain

    Homework Statement I am given an LTI system where I need to obtain the impulse response and difference equation of H(z). H(z) = (1-0.5z^-3) / [(1-0.5z^-1)(1-0.25z^-1)] and |z| > 0.5 Homework Equations The Attempt at a Solution I am pretty lost about what to do. I...
  8. 1

    Problem with 3d impulse and collisions

    Ok so I'm writing a 3D game that uses impulse to determine how things behave when they collide. In this game I have two cubes. Now the shape of each cube is defined by 9 spheres, sort of like this: http://mark.reid.name/images/figures/high-dim-3d.png Though in my game the middle sphere is...
  9. D

    Is It Better to Cram Courses or Take Them Over Multiple Years?

    Hello Everyone, It has been awhile since I have been on the forums. I just finished my third year which was my transition from biology to physics. So far, I have completed first year courses on Mechanics and Electrodynamics as well as one course on introductory quantum mechanics. Now I am...
  10. 1

    How do i find the direction of impulse in 3d?

    I'm writing a game that involves collisions with spheres. Anyway each sphere has both angular and linear velocity. These two spheres collide. I need to find the direction of the impulse between them (if that's the right wording). I tried just subtracting their linear velocity components like...
  11. X

    Impulse Response for a 2nd Order Diffy Q

    y'' + 6y' + 4y = x(t) I found the eigenvalues to be -.764 and -5.24, no problems here. Next, since the order of the response is greater than the order of the excitation, I assumed the unit response took the form: h(t) = k_1e^{-.764t} + k_2e^{-5.24t} So now I must find the values for k_1 and...
  12. T

    How to Calculate Net Impulse from Jumping Motion Analysis

    Homework Statement A person with a mass of 80.6 kg jumps from a squat position into the air. The velocity at the beginning of the jump is zero. Fast motion video analysis reveals that the velocity of the centre of mass at take-off was 5.3 ms-1. Foot contact time when the ground reaction...
  13. M

    Calculating Impulse of a Ball Dropped from Rest

    Homework Statement A 0.150 kg ball is dropped 1.25m from rest. It rebounds to a height of 0.960m. What is the impulse given to the ball by the floor? Homework Equations I=\Deltap and p=mv were the equations I was trying to use. I was pretty sure I should use F=ma since the only other...
  14. T

    How to Calculate Angular Impulse for Inelastic Collision?

    Homework Statement (Refer to attachment) Homework Equations None. The Attempt at a Solution 5.1 Inelastic collision because they stick together. 5.2 Impulse = Lf - Li = Iwf - Iwi = (1/2MR^2 + mR^2)w1 - (1/2MR^2)w0 + mRv0 I tried to use...
  15. G

    Coservation of energy and impulse

    Homework Statement A stream of elastic glass beads, each with a mass of 0.46 g, comes out of a horizontal tube at a rate of 108 per second. The beads fall a distance of 0.54 m to a balance pan and bounce back to their original height. How much mass must be placed in the other pan of the...
  16. B

    Find Difference in Satellite Distances After Impulse

    Homework Statement Ok so I'm told that there is a satellite mass m in a circular orbit of radius ro around the Earth (of mass M). I'm told the speed of the satellite is vo. So I've shown that Eo = total energy of satellite = -1/2mvo^2 Now I am told that whilst the satellite is in its...
  17. P

    Solving a Physics Problem: Impulse and Momentum

    Homework Statement The diagram shows a body, A, of mass 2.00 kg resting in a frictionless, horizontal gulley in which it is constrained to move. It is acted upon by the force shown (0.1 N at 30⁰ below the horizontal) for 5s after which time it strikes and sticks to the body, B, of mass...
  18. A

    Impulse when 2 bodies stick together?

    Hello, I was just wondering if an Impulse was exerted by one body on another if they collided but remained in total contact post-collision. The reason I ask is because my little I=F(delta)t indicates that there should be a change in time to calculate an impulse but in this case the 2 bodies...
  19. C

    Impulse & Change in Momentum: 0.5kg Object Dropping 3m

    Homework Statement A 0.5 kg object drops from rest from a 3m high point. On bouncing from Earth it rises to a height of 2m. The collision with Earth lasts for about 10^-4 seconds. i) What is the impulse received by the object? ii)Considering that there is a gravitational force present, Can you...
  20. morrobay

    Calculate impulse force in inelastic collision

    Homework Statement A bag of sand with mass=55 is dropped from h=30 ft Velocity at impact with Earth is 43.8ft/sec The impact time ( time for sand bag to come to rest) is 1/10 sec. What is the impulse force on the sand bag in this inelastic collision ?Homework Equations Impulse force = change in...
  21. P

    Final Velocity Calculation for a Struck Ball

    When a ball of mass 180 g is struck by a bat moving in the opposite direction, the force acting on the ball is as shown in the graph (Figure 8.37). Determine The final velocity of the ball if it was initially moving at 10.0 m s–1 south. The graph depicted the Impulse as 10Ns (I checked the...
  22. F

    Impulse and Impact time of a collision

    Hi there, For my Final Year Project at University I am analysing Road Restraint Systems/Safety Barriers in a Finite Element Analysis package. My problem is calculating the force exerted onto the barrier by a vehicle during a collision, more specifically the time over which this impact...
  23. M

    Conceptual question about momentum, impulse, and average force.

    Homework Statement In a performance test two cars take the same time to accelerate from rest up to the same speed. Car A has a mass of 1400 kg, and car B has a a mass of 1900 kg. During the rest, which car: a)Has the greatest change in momentum? b)Experiences the greatest impulse? c)Is...
  24. T

    Working equation for change in time (Impulse)

    Homework Statement This http://www.alcaweb.org/cgi-bin/WebObjects/ALCA.woa/wa/resource?id=jQ3f23g01p" takes one to the assignment. Students had to determine specific equations based on list and in turn derive a working equation to calculate the total time it took for a bowling ball to come...
  25. G

    Find Pressure Exerted on Roof by Raindrops in Tropical Storm

    Homework Statement In a tropical rainstorm, 40mm of rain fell in one hour. Assuming that the raindrops struck an adequately drained roof normally with an average speed of 10m/s, find the pressure exerted on the roof by the rain. Homework Equations (delta)p = F(delta)t The Attempt...
  26. A

    Impulse on a Pendulum with a Bullet

    Homework Statement A bullet of mass 0.04kg is fired horizontally into a wooden block of mass 0.09kg. the wooden block is suspended from the ceiling by a long string. after an impact the bullet is embedded in the block and bullet and the block swing together until the block is 0.10m above its...
  27. Q

    What is the difference between pulse response and impulse response?

    I would like to know the difference between pulse response and impulse response. I looked for "pulse" and "impulse" on the internet and found that on some websites they had been used interchangeably. Apart from that I checked out some books and found that they use the term "impulse response"...
  28. I

    Impulse on a pendulum, to maintain amplitude

    Hi I am doing some past exam questions for revision and have got stuck on part d) of the attached question. It is asking, if an impulse is applied to a pendulum, what magnitude of impulse is needed to maintain the pendulums ampiltude. If it helps the ratio of amplitudes from 2 successive...
  29. S

    Collision and Impulse question

    When a male bighorn sheep runs head-first into another male, the rate at which its speed drops to zero is dramatic. Figure 9-11 gives a typical graph of the acceleration a versus time t for such a collision, with the acceleration taken as negative to correspond to an initially positive velocity...
  30. X

    Impulse - Initial velocity of bullet

    1. Homework Statement [/b] Bullet B weighs 0.5 oz and blocks A and C both weigh 3 lb. The coeffient of friction between the block and the plane is \muk = .25. Initially the bullet is moving at v0 and blocks A and B are at rest. After the bullet passes through A it becomes embedded in block C...
  31. M

    Impulse-Momentum: Find Magnitude of Earth's Impulse

    Homework Statement You are standing on a large sheet of frictionless ice and are holding a large rock. In order to get off the ice, you throw the rock so it has velocity relative to the Earth of 11.3 m/s at an angle of 34 above the horizontal. Your mass is 67.0 kg and the rock's mass is 14.4...
  32. O

    How to calculate impulse when velocity is angled?

    Homework Statement Compare impulse for the two objects http://www.screencast.com/users/trinhn812/folders/Jing/media/ecf05e80-8fa7-435c-bfa0-891cf13b176a Homework Equations Change in impulse equation The Attempt at a Solution When you calculate impulse do you have to find the...
  33. H

    Determining impulse on baseball from bat given velocity change

    Homework Statement A(n) 0.182 kg baseball is thrown with a speed of 15.3 m/s. It is hit straight back at the pitcher with a final speed of 10.4 m/s. What is the magnitude of the impulse delivered to the ball? Homework Equations impulse=mass*change of velocity The Attempt at a Solution...
  34. E

    Temporal Impulse response of one electron

    Hi, I am a little bit confused about the impulse response of one electron. Assume that we have LTI system characterized by impulse response h(t) with unit gain, int{h(t)} = 1. Let the input is current i(t) [Amp]. So the output current will be i(t)*h(t). We can view it as i(t) is...
  35. R

    Impulse of a firefighter's net on boy

    Homework Statement A boy of mass 60.0 kg is rescued from a hotel fire by leaping into a firefighter's net. The window from which he leapt was 8.0 m above the net. The firefighters lower their arms as he lands in the net so that he is brought to a complete stop in a time of 0.40 s. 1.What is...
  36. P

    Find Force Exerted on Soccer Ball, Impulse Q Homework

    Homework Statement Soccer player kicks stationary .45-kg ball to a teammate. The balls reaches a max height above ground of 2m at a horizontal distance 5m from the point where it was kicked. The duration of the kick was .04s. Neglecting aero drag, determine the magnitude of the average force...
  37. J

    Impulse and momentum homework help

    Homework Statement Two objects are at rest on a frictionless surface. m1 > m2 (1) When a constant force is applied to object 1, it accelerates through a distance d in a straight line. The force is removed from object 1 and is applied to object 2. At the moment when object 2 has accelerated...
  38. J

    Momentum and Impulse Homework-

    Homework Statement A bronze statue of Bhudda was completed in Tohyo in 1993. The statue is 35 m tall and has a mass of 1,000,000 kg. Suppose this statue were to be moved to a different location. What is the magnitude of the impulse that must act on the statue in order for the speed to...
  39. G

    Impulse of a falling ball under gravity onto a solid surface

    Homework Statement A 0.5-kg rubber ball is dropped from rest a height of 19.6 m above the surface of the Earth. It strikes the sidewalk below and rebounds up to a maximum height of 4.9 m. What is the magnitude of the impulse due to the collision with the sidewalk? Homework Equations...
  40. S

    "Impulse & Force in Pitcher-Catcher Fastball

    Homework Statement A pitcher throws a fastball to the catcher. Assuming the speed of the ball does NOT change appreciably in flight a) which player exerts the larger impluse on the ball? why? b) which player exerts the larger force on the ball? why? Homework Equations The...
  41. K

    Solving Impulse Function Homework: [1 2 3 4] for n= -4 to 0

    Homework Statement Hi guys, I tried google for it but no avail so i seek for your help. I have a impulse function x[n] = [1 2 3 4] for n= -4 to 0 The Attempt at a Solution what does the 1 2 3 4 inside the bracket mean? at n = -3, there is a amplitude of 2? Thank you.
  42. J

    Impulse and momentum of a golf ball

    Rocio strikes a 0.058kg golf ball with a force of 272N and gives it a velocity of 62.0m/s. How long was Rocio's club in contact with the ball? A force of 186N acts on a 7.3kg bowling ball for .40s. What is the bowling ball's change in momentum? What is its change in velocity...
  43. N

    Calculating Impulse on a Baseball Colliding with a Bat: Magnitude and Duration

    A 0.300 kg baseball just before and after it collides with a bat. Just before, the ball has a velocity v1 of magnitude 12.0 m/s and angle θ1 = 35°. Just after, it is traveling directly upward with velocity v2 of magnitude 10.0 m/s. The duration of the collision is 1.5 ms. (a) What is the...
  44. S

    Computing impulse response (help)

    I am trying to find the impulse response h[n] of a LSI system: y[n]+ay[n-1]=bx[n]-cx[n-1]. The way that I think to solve this problem is compute the z-transform, and from this H(z)=Y(z)/X(z). Then take the inverse z-transform to find h[n]. Is there another way to compute this? Also, for H(z)...
  45. A

    How Is Impulse Calculated for a Tennis Ball Hitting a Wall?

    Homework Statement A tennis ball of mass m = 0.087 kg and speed v = 43 m/s strikes a wall at a 45° angle and rebounds with the same speed at 45° (Fig. 7-29). What is the impulse given the wall? Homework Equations Impulse = M x V Sin (theta) = opp/hyp The Attempt at a Solution...
  46. G

    Impulse: Clay ball that sticks vs. Rubber ball that bounces?

    Homework Statement A 10 g rubber ball and a 10 g clay ball are thrown at a wall with equal speeds. The rubber ball bounces, the clay ball sticks. Which ball exerts a larger impulse on the wall? Homework Equations J (impulse) = Favg*dt The Attempt at a Solution I think that...
  47. S

    How Is Impulse Calculated in Volleyball Spiking?

    Homework Statement A ball is traveling horizontally over a volleyball net when a player "spikes" it, driving it straight down to the ground. The ball's mass is 0.20 kg, its speed before being hit is 6.4 m/s and its speed immediately after the spike is 21 m/s. What is the magnitude of the...
  48. B

    Calculating Impulse of a Bouncing Steel Ball | Momentum and Impulse Homework

    Homework Statement A steel ball with mass 0.347 kg falls onto a hard floor and bounces. Its speed just before hitting the floor is 23.6 m/s and its speed just after bouncing is 12.7 m/s. (a) What is the magnitude of the impulse of the ball? Homework Equations J=pf-pi The Attempt at...
  49. K

    Convolution in Discrete time of a function with Impulse with delay?

    Here is convolution: c[k]= (0.5)^k * delta(k-1) What do I do about delta(k-1)? I know if it is c[k]= (0.5)^k * delta(k), then it just equal (0.5)^k But what do I do with delta(k-1)?
  50. S

    How Do Kinematics and Impulse Principles Apply in a Two-Particle Pulley System?

    Homework Statement Two particles of masses 8 kg and 5 kg are connected to the two ends of a light inextensible string which passes over a fixed smooth pulley. Initially each of the two particles are held at a position which is 5 m above a horizontal ground. The objects are then released from...
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