Question

Consider a football halfback with a mass of 90 kg running down the football field and encountering a collision with a defensive back. If the halfback experiences a force of 800 N for 0.9 seconds, how much impulse will he experience?

Answer 1

Answer:

Impulse: $720 N\cdot s$

Explanation:

The impulse experienced by an object is given by:

$I=F\Delta t$

Where

F is the magnitude of the force exerted on the object

$\Delta t$ is the time interval during which the force is applied

I is the impulse

For the halfback in this problem, we have:

F = 800 N is the force experienced

$\Delta t = 0.9 s$ is the time interval

Therefore, the impulse experienced is

$I=(800)(0.9)=720 N\cdot s$

And this impulse is also equal to the change in momentum of the halfback.