A 1700kg car is traveling at 20m/s. The car in front of him slams on their brakes. By the time the driver notices the other car has stopped he only has 2.5s to stop.

What is the change in momentum of the car?

What is the Impulse felt by the driver as the car comes to a stop?

What is the force needed to stop the car?

Anaverage person(80kg) wants to perform a super hero landing from a height of 30m (a fall from this height means you hit the ground at 24.5 m/s). Let's assume that it takes them 0.5s to come to a complete stop (This stopping time is generous as they stop almost instantly).

Calculate the change in momentum of the person.

It takes about 4000 N to break a femur bone (thigh bone), should this person attempt a superhero landing from that height? (What is the impact force felt by the person?)

A 1500kg Ferrariaccelerates out of a turn from 20m/s to 40m/s in 3s.

What is the force required by the engine to perform this acceleration?

What is the impulse felt by the driver?

Calculate the change in momentum.

If the driver slams on the brakes and goes from 40m/s to rest in 2.7s, what is the impulse felt by the driver?

A 0.45 kg baseball is pitched at -47m/s. After being hit by the batter it has a velocity of 50 m/s. The batter generates 30,000N of force in the swing.

Why is one of the velocities negative?

What is the V for the baseball

What is the change in momentum experienced by the baseball?

For how long is the ball in contact with the bat?

What would happen to the hit velocity of the ball if the contact time was increased (assume the force, mass and pitch velocity do not change)

How much work is required to lift a 3kg backpack off the floor to a height of 1.3m?

If you lift the backpack in 2s, how much power did you generate?

If you then drop the backpack, what is its change in momentum? (Hint: you will need to find how long the backpack took to fall and the backpacks final velocity)

What is the impulse of the backpack when it hits the ground?

A common test for automobile performance is driving the car from 0mph - 60mph - 0mph. This tests both the acceleration of the car and its stopping time. Calculate the total momentum change of a 1850kg car as it goes through this test. Use 60mph = 27m/s.

Calculate the force required to stop a 0.4 kg bullet fired at 950 m/s. Assume the bullet will come to rest in 0.02s.

Two cars get into a collision. The 1950kg black SUVwas stopped at a red light. The 1500kg green car was traveling 15m/s. The driver of the green carnever applied the brakes.

What is the change in momentum of the green car?

What is the Impulse felt by the driver of the black SUV?

If the collision impact lasted for 1.4s, what force did the driver of the black SUV experience?

A 18,000 N car isout of gas. If you and your friends push with 300N for 10s and can't get it moving, How much work did you and your friends do?

Some other people come to help and now all of you can push with 400 N. After 20s of pushing, how fast is the car moving?

What is the change in momentum of the car after 20s?

You carry a 3kg backpack at a constant velocity for 120m and the trip takes you 60s.

How much work did you do on the backpack?

What is the change in momentum of the back during the trip?

After 120m, you stop to speak with a friend, calculate thepfor the backpack.

While you speak, you set the backpack on the floor, if the backpack traveled 1.25m in 3s, what is its Impulse?

You perform 1000J of work carrying a 28kg couch for 12s. If you carry the couch for 20m, what is the change in momentum of the couch?

A car possesses 20,000 kgm/s of momentum. What would be the car's new momentum if ... its velocity was doubled. its velocity was tripled. its mass was doubled (by adding more passengers and a greater load) both its velocity was doubled and its mass was doubled. its impulse was halved the car came to rest

A 0.50-kg cart (#1) is pulled with a 1.0-N force for 1 second; another 0.50 kg cart (#2) is pulled with a 2.0 N-force for 0.50 seconds. Which cart (#1 or #2) has the greatest acceleration? Explain.

Which cart (#1 or #2) has the greatest impulse? Explain. Which cart (#1 or #2) has the greatest change in momentum? Explain.