Chapter 7 Momentum

A 336 kg American sumo wrestler Emanuel is running towards his steady opponent with a speed of 0.02 km/s. He weighs 3 times as much as his opponent. Assuming they both stick together, how fast are they falling after the collision?

0.015 km/s

What is the momentum of a 200 kg tunner who covers 400 m in 50 s?

1,600 kg * m/s

A 30 kg girl and a 25 kg boy face each other on friction-free roller skates. The girl pushes the boy, who moves away at a speed of 2 m/s. What is the girl's speed?

1.6 m/s

A car with a mass of 1000 kg moves at 20 m/s. What brake force will be required to stop the car in 5 seconds?

4000 N

A 400 kg hawk missile launcher launched a missile of 35 kg and recoiled back with a speed of 5 m/s. What is the speed of the missile after being launched?

57.142 m/s

Impulse

Change in momentum

If superman at rest in free space throws an asteroid that has more mass than superman, then which moves faster?

Superman

Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30 miles per hour?

The large truck

A ping-pong ball gun is fired. Compared to the impulse on the ball, the amount of impulse the gun is...?

The same

How does follow through help a golfer?

There is a longer time of application of force and there is more change in velocity.

Compared to a sports car moving at 30 miles per hour, the same sports car moving at 60 miles per hour has...?

Twice as much momentum

Conserved

When momentum, or any quantity in Physics, does not change

Elastic collision

When objects collide without being permanently deformed and without generating heat

Inelastic collision

Whenever colliding objects become tangled or couple together

The cannonball shot from a cannon with a long barrel will be faster because the cannonball receives a greater..?

Impulse

Law of conservation of momentum

In the absence of an external force, the momentum of a system remains unchanged

Momentum

Inertia in motion