What is Laws of motion: Definition and 214 Discussions

In physics, a number of noted theories of the motion of objects have developed. Among the best known are:

Classical mechanics
Newton's laws of motion
Euler's laws of motion
Cauchy's equations of motion
Kepler's laws of planetary motion
General relativity
Special relativity
Quantum mechanics

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  1. K

    Some Applications of Newton's Laws of Motion

    This is probably really easy, but I can't figure out what to do. A man of mass 80kg (W= 176 lb) jumps down to a patio from a window ledge .50m (1.6ft) from ground. He doesn't bend his knees on landing so his motion is arrested in a distance 2.0cm (.79in) What is the acceleration of the man...
  2. A

    Questions on projectiles & Newton's laws of motion

    hi there falks i need some hard questions on projectiles & Newton's laws of motion...
  3. Greg Bernhardt

    Explore Newton's Laws of Motion with Dr. Donald Luttermoser of ETSU

    Author: Dr. Donald Luttermoser of East Tennessee State University
  4. L

    Conceptual Newtons laws of motion question- mass and weight

    You have just landed on Planet X. You take out a ball of mass , release it from rest from a height of and measure that it takes a time of to reach the ground. You can ignore any force on the ball from the atmosphere of the planet. How much does the ball weigh on the surface of Planet X?
  5. P

    Nonequilibrium Applications of Newton's Laws of Motion

    A 292 kg motor cycle is accelerating up along a ramp that is inclined 30.0 degrees above the horizontal. The propulsion force pushing the motorcycle up the ramp is 3150 N, and air resistance produces a force of 250 N that opposes the motion. Find the magnitude of the motorcycle's acceleration.
  6. A

    Calculating Force Needed to Accelerate a 7.00g Pellet from Rest to 175 m/s

    8. What average force is needed to accelerate a 7.00-gram pellet from rest to 175 m/s over a distance of 0.700 m along the barrel of a rifle? 9. A fisherman yanks a fish out of the water with an acceleration of 4.5 m/s^2 using very light fishing line that has a "test" value of 22 N. The...
  7. M

    How Do You Calculate Jet Mass Using Force and Acceleration?

    Been struggling wih this problem all afternoon. On an aircraft carrier, a jet can be catapulted fom 0 to 155 mi/hr in 2.00 sec. If the average force exerted by the catapult is 5.10 * 10^6 Newtons, what is he mass of the jet? We converted the velocity into meters/second and got 69.276...
  8. B

    Laws of Motion, vertical acceleration question.

    "In a lift accelerated upwards at a certain rate, a spring balance indicates a weight to have a mass of 10kg. When the lift is accelerated downwards at twice the upward rate, the mass appears to be 7kg. Find the actual mass and the upward acceleration of the lift." In short, I am stuck. I...
  9. B

    What is the Impact of a Time-Dependent Force on an Object's Velocity?

    A time-dependent force, F=(8i-4tj) N, where t is in seconds is exerted on a 2 kg object initially at rest. At what time will the object be moving with a speed of 15 m/s?
  10. S

    Having some trouble ie. help me (Newton's Laws of Motion - Basic stuff)

    A 4.9N hammer head is stopped from an inital downward velocity of 3.2m/s in a distance of .45cm by a nail in a pine board. In addition to its weight there is a 15N downward force on the hammer by the peson using the hammer. Assume the acceleration of hte hammer head is constance while its in...
  11. I

    Are Newton's three laws of motion essentially correct

    Newton's three laws are; 1. Inertia 2. f=ma 3. for every action there is an equal an opposite reaction. It seems to me that the first and third law are still valid with the theory of relativity. And the second law f=ma is generally true in so far as it is correct to say that there exists...
  12. T

    Can QM be derived from Newton's Laws of motion

    Here is an answer I have just given to a question about the journey of light, which applying its logic you can derive QM and GR. Newton's first law of motion state "Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it."...
  13. S

    How Do Newton's Laws Apply to a Frictionless Pulley System?

    The problem was pretty simple i thought, but according to the book i get the wrong answer. I think i might be approching the problem wrong. "In the drawing, the weight of the block on the table(block1) is 422N and that of the hanging block(block2) is 185N. Ignoring all frictional effects and...
  14. S

    Various Laws of Motion, Energy, Momentum and Collision Problems

    I have this take home test I'm doing for Physics. I did all the problems and was just wondering if someone can correct me if I'm wrong on any of the problems because I'm on the borderline B-/C+ and I could really use your guys' help to check the problems. Thanks a lot. **=not sure/dont know...
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