# Impulse Momentum Theorem Physics Problems - Average Force & Contact Time | Summary and Q&A

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October 4, 2017
by
The Organic Chemistry Tutor
Impulse Momentum Theorem Physics Problems - Average Force & Contact Time

## TL;DR

This video explains how to solve problems using the impulse momentum theorem, including calculating impulse, change in momentum, and final speed.

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### Q: What is the impulse acting on the block in the given problem?

The impulse is equal to the force multiplied by the change in time, which is 500 Newtons times seconds.

### Q: How do you calculate the change in momentum?

The change in momentum is equal to mass times velocity, so for the given problem, it would be positive 500 Newtons times seconds or kilograms times meters per second.

### Q: What is the final speed of the block if it was initially at rest?

To calculate the final speed, you need to use the equation mass times change in velocity. In this case, the change in velocity is 25 meters per second, so the final speed would be 25 meters per second.

### Q: What is the final speed of the block if it was initially moving at 15 meters per second?

Using the same equation, the final speed would be 40 meters per second, as the initial speed was 15 meters per second.

## Summary & Key Takeaways

• The impulse momentum theorem states that force multiplied by the change in time is equal to the change in momentum.

• Impulse can be calculated by multiplying force by the change in time.

• The change in momentum is equal to mass times velocity.

• The final speed of a block can be determined based on the impulse and initial speed.