Question

Part A: If you throw a raw egg against a wall you’ll break it, but if you throw it with the same speed into a sagging sheet it won’t break. Why?

1. The velocity of the egg decrease factor in the sheet than on the wall.

2. The breaking egg causes a larger impact time, decreasing the force.

3. The sheet is much slicker than the wall.

4. The impact time when the egg strikes a sagging sheet is long, so the impact force is small.

Part B: Whenever an interaction occurs in a system, forces occur in equal and opposite pairs. Which of the following do not always occur in equal and opposite pairs?

1. Accelerations

2. Momentum Changes

3. But all of these occur in equal and opposite pairs.

4. None of these.

5. Impulses

Answer 1

Part A: 4. The impact time when the egg strikes a sagging sheet is long, so the impact force is small.

Explanation: For the shell of the egg to break requires a high IMPULSE, or instantaneous force. With the wall, all the force to stop the egg occurs almost at the same time, so the impulse is very high, breaking the egg. With the sheet however, the force to stop the egg is applied over a much greater period of time. Therefore, the force is lower at each instant of the collision. Since the impulse is much less than what is required to break the shell, the egg does not break.

Part B: 1. Accelerations

Explanation: Impulse and Momentum changes occurs in equal and opposite pairs,but Accelarations not always occurs in equal and opposite pairs because of the masses of each system different(mass of two bodys are not same in every case).