Why does the total amount of mechanical energy stay constant in a system?

energy is not created or destroyed

energy is not converted from one form into another

A roller coaster whose average speed is 32 m/s is at the top of a 72m hill and weighs 966N. At the top of the hill the coaster car has ___________________ energy.

both kinetic and potential energy

Which statement illustrates work done?

A rolling marble hits a note card and moves it across a table.

A weightlifter holds a barbell above her head.

A teacher applies a force to a wall and becomes exhausted.

A waiter carries a tray full of meals across a dining room at a constant speed.

A block starts at rest at point P at the top of a ramp which is height h above the ground. The block slides down one side and up the other, stopping at a point less than h above the ground.

The block did not go as high on the other side because work from friction made the mechanical energy less.

The block did not go as high on the other side because gravity pulls down.

The block did not go as high on the other side because potential energy always has to decrease.

The situation as described is impossible to happen.

How does conservation of energy explain why something that is falling should speed up?

It gains kinetic energy because it loses potential energy.

It gains kinetic energy because it gains potential energy.

It loses kinetic energy because no work was done on it.

It loses kinetic energy because the Earth gains potential energy.

Work, Power, Energy

Authored by Hazel Cooper

Physics

9th - 12th Grade

NGSS covered

Used 11+ times

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

How do you calculate power?

P = W/t

P = E/t

P = w * t

P = bbq/chicken

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How do we calculate work?

W = F * d

w = f * D

W = F * D

w = f * d

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

How much work is being done with 200 N of force over 426 meters?

85,200 J

45,620 J

90,480 J

62,329 J

The SI unit of work is?

Joules

Watts

Newtons

meters

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The energy of movement is...?

Kinetic

Potential

Energy that is stored is called...

Kinetic

Potential

The SI unit for power is...?

Watts

Joules

Newtons

Meters

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Work, Power, Energy

How do you calculate power?

How do we calculate work?

How much work is being done with 200 N of force over 426 meters?

The SI unit of work is?

The energy of movement is...?

Energy that is stored is called...

The SI unit for power is...?

What is the formula for Kinetic Energy?

A force exerted over a distance to move an object is ______________________.

If 150 Joules of work is needed to move a box 10 meters, what force was used?

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