Suppose two snooker balls each having a momentum collide with each other and then rebound.
Another way of writing this is in equation form as follows:
1. Two trolleys collide in the following way:
(a) Calculate the value of V2 after the two trolleys collide. ______[2]
(b) Write down a formula for Kinetic Energy. ______[1]
(c) Calculate the kinetic energy of both trolleys before and after the collision and decide if it was an elastic or inelastic collision.
______[3]
2. Suppose the same two trolleys were to collide again but they somehow stick together and move off with a common velocity.
Calculate the common velocity V.
______[2]
3. Both trolleys are initially travelling towards each when they collide.
(a) During the collision M1 rebounds with a velocity of 0.5 m/s. Find V2.
(HINT: When placing the values of the velocities into the equation the direction of the velocity must also be considered!)
______[2]
(b) Examine the kinetic energy of the trolleys before and after the collision and then comment on the result. ______[3]
(4) A bullet of mass 45 g is travelling horizontally at 400 m/s when it strikes a wooden block of mass 16 kg suspended on a string so that it can swing freely. The bullet is embedded in the block.
Calculate the velocity of the combined block and bullet after the collision.
______[3]
(5) A rifle of mass 3 kg fires a bullet with a mass of 20 grams with a velocity of 600 m/s.
(a) Name the type of collision involved in this situation. ______[1]
(b) Discuss whether both energy and momentum are both conserved during this type of collision. ______[2]
(c) Calculate the recoil velocity of the rifle.
______[3]
4. Two trolleys are pushed together against a spring and held at rest. The trolleys are then released and the spring causes them to “explode” apart.
(a) If trolley A is given a velocity of 2 m/s to the left, find the velocity of B.
______(2)
(b) If the spring takes 2 second to expand and drop away from the trolleys calculate:
(i) the change of momentum per second of trolley A. ______(1)
(ii) the change of momentum per second of trolley B. ______(1)
(iii) Do both the trolleys receive the same force during the collision? Challenging question here: There are two ways in which you could deduce the answer can you think of both? ______
(iv) If the spring took a longer time to expand back to its original shape do you think the force on the trolleys would be the same? ______(1)
(v) Explain. ______(1)
5. (a) Why are seat belts designed to stretch during a collision? ______(2)
(b) What is the purpose of an air bag? ______(2)
(c) Why does a cricket batsman, a tennis player, a footballer or a golfer “follow through” when hitting the ball? ______(2)