Momentum and Impulse Concepts

The video tutorial explains the impulse-momentum theorem and demonstrates how to solve problems related to it. It covers calculating impulse on a block, determining the change in momentum and final speed of a block, and calculating the impulse and average force exerted on a ball by a bat. Additionally, it explains how to calculate the force exerted by a wall on a tennis ball, emphasizing the importance of understanding velocity as a vector in momentum calculations.

What is the impulse acting on a 20 kg block when a 50 N force is applied for 10 seconds?

• 200 N·s

• 1000 N·s

• 50 N·s

• 500 N·s

How is impulse related to change in momentum?

• Impulse is equal to the change in momentum

• Impulse is unrelated to change in momentum

• Impulse is half the change in momentum

• Impulse is double the change in momentum

If a block initially at rest has a change in velocity of 25 m/s, what is its final speed?

• 10 m/s

• 25 m/s

• 0 m/s

• 50 m/s

What is the final speed of a block initially moving at 15 m/s after a change in velocity of 25 m/s?

• 40 m/s

• 15 m/s

• 50 m/s

• 25 m/s

What is the change in momentum of a 0.20 kg ball that reaches a speed of 35 m/s from rest?

• 10 kg·m/s

• 3.5 kg·m/s

• 5 kg·m/s

• 7 kg·m/s

What is the impulse exerted on a ball if its change in momentum is 7 kg·m/s?

• 14 N·s

• 7 N·s

• 0 N·s

• 3.5 N·s

How do you calculate the average force exerted by a bat on a ball if the impulse is 7 N·s and contact time is 0.02 s?

• 350 N

• 700 N

• 175 N

• 35 N

What is the average force exerted by a wall on a 0.25 kg tennis ball that changes velocity from 50 m/s east to 50 m/s west?

• 1667 N

• 833 N

• 2500 N

• 500 N

If a tennis ball's velocity changes by 100 m/s, what is the change in velocity?

• 50 m/s

• 100 m/s

• 150 m/s

• 200 m/s

What is the direction of the force exerted by the wall if a ball bounces back in the opposite direction?

• North

• South

• West

• East