In which of the examples given below is momentum not conserved? 2 marksA rocket launch in space without air Snooker ball bouncing of the edge of a frictionless table A ball being kicked by a person on the grass with friction All of the above
Question
In which of the examples given below is momentum not conserved? 2 marksA rocket launch in space without air Snooker ball bouncing of the edge of a frictionless table A ball being kicked by a person on the grass with friction All of the above
Solution
The principle of conservation of momentum states that the total momentum of an isolated system remains constant if no external forces act on it.
A. A rocket launch in space without air: In this case, the momentum is conserved. The rocket propels forward by expelling gas backward. The momentum of the rocket and the expelled gas is equal and opposite, so the total momentum is conserved.
B. Snooker ball bouncing off the edge of a frictionless table: Here, the momentum is also conserved. The ball's momentum before and after the bounce remains the same because there's no external force acting on it.
C. A ball being kicked by a person on the grass with friction: In this case, the momentum is not conserved. The friction between the ball and the grass is an external force that slows down the ball, changing its momentum.
So, the answer is "A ball being kicked by a person on the grass with friction".
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