Momentum & Impulse

A ball is moving horizontally and strikes a vertical wall from which it rebounds horizontally. The sketch graph shows how the contact force F between ball and wall varies with time of contact t. The maximum value of $F$ is $F_0$ and the total time of contact between ball and wall is $T$ . What is the change in momentum of the ball?

Child X throws a ball to child Y. The system consists of the ball, the children and the Earth. What is true for the

system when the ball has been caught by Y? 

Before and after snapshots of a car’s velocity are shown. All cars have the same mass. Rank the magnitude of the change in momentum of the cars from highest to lowest. In case two situations have the same change in momentum, rank them alphabetically.

A ball of mass m collides with a wall and bounces back in a straight line. The ball loses 75 % of the initial energy during the collision. The speed before the collision is v. What is the magnitude of the impulse on the

ball by the wall? 

A ball of mass 0.2 kg strikes a force sensor and sticks to it. Just before impact the ball is travelling horizontally at a speed of $4.0\frac{m}{s}$ . The graph shows the variation with time t of the force F recorded by the sensor. What is the maximum force reached?

A 9.5 kg dog just woke up form a nap in a canoe that was stationary. He walks along the length of the canoe at $0.5\frac{m}{s}$

relative to the water and the canoe moves in the opposite direction at $0.15$ $\frac{m}{s}$. What is the mass of the of the canoe (in kg)?

--> Round your answer to 2 SF

A ball of mass 0.250 kg is released from rest at time t = 0, from a height H above a horizontal floor. The graph shows the variation with time t of the velocity v of the ball. Air resistance is negligible. Take $g=-9.80\ \frac{m}{s^2}$. The ball reaches the floor after 1.0 s. Determine the average force exerted on the floor by the ball (in N).