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Study these flashcards

Cate L.

• 47

cards
If the net external force acting on a system is zero, then the total momentum of the system is zero.

F, momentum has to do with internal forces

Impulses are smaller when bouncing takes place.

F

After a firecracker falling through the air explodes, the net momentum of its fragments decreases.

F

The padding on car dashboards lengthens the time of a passenger’s impact during a collision.

T

If a net force acts on a system, the system’s momentum will change.

T

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

large Truck

If the momentum of an object changes and its mass remains constant

The momentum change of an object is equal to the

**A Ping-Pong ball launcher is fired. Compared to the impulse on the ball, the amount of impulse on the**

launcher is

m1 x v1 + m2 x v2 + mt x vt is used to

Impulse is

work is done when a

Work is the product of the force on an object and

Power is the amount of work done divided by

Whenever work is done the energy

Energy is

Work equals the change in

Energy can neither be

the formula for work is

The net momentum of both objects before and after a collision is the

When objects perfectly bounce of one another, it is an

Impulse is equal to

After an inelastic collision, the objects move

after an elastic collision, the objects

The formula for momentum is

Momentum is (in words)

Whenever one object exerts a force on the second object, the second object exerts

Explain why the accelerations caused by an action force and by a reaction force do

not have to be equal

For every interaction between things, there is always

The rate at which work is done is called power

The energy an object has by virtue of its location is called its potential energy

The energy an object has by virtue of its motion is called its kinetic energy

If Nellie Newton pushes an object with twice the force for twice the distance, she does

How much work is done on a 50-N rock that you lift 10 m straight up?

How much power is expended if you lift a 50-N rock 10 meters in 1 second?

An object that has kinetic energy must be

An arrow in a bow has 70 J of potential energy. Assuming no energy loss, how much kinetic energy will it have after it has

been shot?

How much work is done in lifting 30 kg of bricks to a height of 20 m?

When does a pendulum have the most potential energy?

When does a pendulum have the most kinetic energy?

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