Two hockey pucks (150g each) are travelling across the ice in a straight line. Puck 1 is travelling faster than Puck 2 and catches up with, and collides with, Puck 2. The initial velocity of Puck 1 was 3 ms^-1 and the initial velocity of Puck 2 was 2 ms^-1, both to the right. Following the collision the velocity of Puck 1 is 2 ms^-1 to the right. Puck 2 experiences an impulse of 0.15 kg m/s right from puck 1.

What is the speed of Puck 2 after the collision?

Two hockey pucks (150g each) are travelling across the ice in a straight line. Puck 1 is travelling faster than Puck 2 and catches up with, and collides with, Puck 2. The initial velocity of Puck 1 was 3 ms^-1 and the initial velocity of Puck 2 was 2 ms^-1, both to the right. Following the collision the velocity of Puck 1 is 2 ms^-1 to the right.

What is the impulse of Puck 1 on Puck 2?

At a crash test facility scientists run a car of mass m into a wall at a velocity v. The car comes to rest following the collision. The experiment is repeated several times at the same velocity for several different cars (all of mass m). Given that the mass of the cars and the velocity of the cars are all the same, the only way to alter the average force exerted on the passenger is to change the duration of the collisions.

Which of the following features of cars/roads act to increase the collision time directly (i.e. while a collision is occurring)?

At a crash test facility scientists run a car of mass m into a wall at a velocity v. The car comes to rest following the collision. The experiment is repeated several times at the same velocity for several different cars (all of mass m).

Given that the mass of the cars and the velocity of the cars are all the same, what aspect of the collision can a car designer try to change to reduce the average force applied to the car (and hence to the occupants of the car)?

A tennis ball of mass 50g is hit against a wall. It hits the wall going right at 5 ms^-1 and rebounds to the left at 4 ms^-1, changing its momentum by 0.45 kg m/s left. The ball is in contact with the wall for 0.2 s and experiences an average force of 2.25 N left (applied by the wall).

What is the force of the ball on the wall?

A tennis ball of mass 50g is hit against a wall. It hits the wall going right at 5 ms^-1 and rebounds to the left at 4 ms^-1, changing its momentum by 0.45 kg m/s left.

If the ball is in contact with the wall for 0.2 s what is the average force applied by the wall on the ball (your answer is a vector)?

A tennis ball of mass 50g is hit against a wall. It hits the wall going right at 5 ms^-1 and rebounds to the left at 4 ms^-1.

What is the change in momentum of the tennis ball?

Question 1 a)

An unlucky driver has become bogged in the mud near a tree. Fortunately,

they find a rope in their car and attach it to the tree and car, and they pull on

the rope as shown in the picture. Also shown is the resulting force diagram,

demonstrating why the technique works: the car experiences a very large force

with a relatively small ‘tug’ applied by the driver.

The

sum of the three forces acting on the centre point of the rope is assumed to be

zero because:

Approximately

what percentage of the ball’s initial kinetic energy (before the bounce) is the

ball’s final kinetic energy (after the bounce)? Give your answer to the nearest

whole number in units of %. Write your answer without units i.e., 12 % as 12.

Question 4 c)

Immediately