Velocity attained by sled

  • Thread starter Phyzor
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So, using F=ma, we can find the acceleration, and then plug that into v= u+at to find the final velocity. Then, we can plug that into s= 1/2(u+v)t to find the distance traveled in 5 seconds. In summary, we can use the formula F=ma to find the acceleration, and then plug that into v=u+at and s=1/2(u+v)t to find the velocity and distance traveled in 5 seconds.
  • #1
Phyzor
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OK I'm stuk on a physics question involving Newton's Laws of motion.

Question:

Boy gives his sister ride on sled by exerting force of 300 N[E].
Frictional resistance amounts to 200 N. If sister and sled have combined mass of 50 kg, and if boy starts from rest and pushes for 5 sec., find:

a) the sled's acceleration
b) velocity attained by sled in 5 sec.
c) distance traveled by sled in 5 sec.


PLZ try to help and show step by step solutions

Reply ASAP thanx:smile:
 
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  • #2
It's not the policy here to do peoples homewrok, but I'll give you the relevant formulae:

F = ma, v = u + at, s = ½(u + v)t

F is force, m is mass, a is acceleration ,v is final velocity, u is intial velocity, s is displacemnet and t is time.
 
  • #3
Reply

Wait, how do we find initial velocity?

Thanx for help.
 
  • #4
We don't. But since the problem asked for the "velocity attained" (i.e. the increase in velocity), we can take it to be 0- that way the final velocity WILL be the increase in velocity.
 

1. What is the definition of velocity attained by a sled?

Velocity attained by a sled is the speed and direction at which the sled is moving at a particular moment in time. It is a vector quantity, meaning it has both magnitude (speed) and direction.

2. How is velocity attained by a sled calculated?

Velocity attained by a sled is calculated by dividing the change in distance by the change in time. This is known as the average velocity formula: v = (d2 - d1) / (t2 - t1), where v is velocity, d is distance, and t is time.

3. What factors affect the velocity attained by a sled?

The velocity attained by a sled is affected by several factors including the mass of the sled, the force applied to the sled, the surface it is sliding on, and air resistance. Additionally, the angle of the slope and the friction between the sled and the surface can also impact the sled's velocity.

4. How can the velocity attained by a sled be increased?

The velocity attained by a sled can be increased by reducing the mass of the sled, increasing the force applied to it, choosing a smoother surface to slide on, and minimizing air resistance. Additionally, increasing the angle of the slope and reducing friction can also result in a higher velocity.

5. How does the velocity attained by a sled affect its overall performance?

The velocity attained by a sled directly impacts its performance. A higher velocity allows the sled to travel further and faster, while a lower velocity may result in slower and shorter trips. The velocity also affects the amount of control the rider has over the sled, as higher speeds can be more difficult to maneuver.

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