|
VISUAL PHYSICS ONLINE 2
DYNAMICS P20 007 The graph below shows the time variation of momentum for a 3.00 kg object moving in a straight line and subject to a constant retarding force. During this time, the object undergoes a collision.
(a) What is the speed of the
3.00 kg object at time t = 3.00 s? (b) What is the
magnitude of the retarding force acting on the ball before the collision? (c) At t =
6.00 s, the object collides head-on with a stationary 1.00 kg object. The two
objects move off in the same direction along the straight line. What are the
momenta of the two objects after the collision? (d) What are the speeds
of the two objects immediately after the collision? View solution below only after you have completed the
answering the question. |
|
Solution Let
the 3.00 kg object be system A and the 1.00 kg object be System B
Impulse Momentum Impulse
= Change in momentum
(A) System A
(B) For System A before the collision
(C)(D)
Systems A and B: momentum
is conserved during the collision Momentum just before collision is 6.00 kg.m.s-1. Immediately after the collision the momentum of
System A is 4.00 kg.m.s-1 and its speed is
So, the momentum of System B immediately after
the collision is 2.00 kg.m.s-1 and the speed of System b is
|
