Final answer:
Padding reduces forces in a collision by increasing the time interval over which the force is applied. Landing on your feet while jumping on a trampoline allows for a greater height due to increased impulse. Tennis racquets have sweet spots that minimize the impulse applied to the player's arm.
Step-by-step explanation:
Padding reduces forces in a collision by increasing the time interval over which the force is applied, reducing the impulse experienced. This is known as the principle of impulse-momentum. For example, in a day care center, a carpeted floor provides more cushioning compared to a tile floor. When a child falls, the carpeted floor increases the time of impact, reducing the force exerted on the child's body and minimizing the risk of injury.
When landing on your feet while jumping on a trampoline, you can reach a greater height compared to landing on your back. This is because landing on your feet allows more time for the trampoline to push you back up, resulting in a larger impulse and greater height. Landing on your back affects the time interval and decreases the impulse applied.
Tennis racquets have sweet spots where the ball should be hit. When the ball hits the sweet spot, the impulse applied to the player's arm is minimized. This is because hitting the sweet spot reduces the time over which the force is applied, decreasing the change in momentum and reducing the jarring effect on the player's arm.