What is an equivalent formula for force?

F = d × t F=d\times t F = d × t

m = F × a m=F\times a m = F × a

A force applied on a block accelerates across a horizontal, frictionless surface. The energy gained by the block is equal to which?

the momentum given to the block

the impulse applied to the block

Which of the following is a true statement about work?

It measures how much effort is applied over a certain distance

It measures how quickly an object accelerates

It measures the change in an object's rate of speed

It measures how much time it takes to move a massive object

In which scenario is Charlotte doing work?

Charlotte picks up her books from her desk.

Charlotte carries her books to her next class.

As the sun went down, the house became dark and Kyle turned on the lights. Which statement is true about power?

The power of the light Kyle turned on is the amount of energy transferred per time.

The power of the light Kyle turned on is used to exert force.

The power of the light Kyle turned on can be calculated using force and distance.

How can you increase your power when mowing grass?

Spend more time mowing your grass.

Mow less of your yard per minute.

Two equal mass marbles are at the top of a ramp. One marble falls to the ground off the back while the other rolls down the ramp. What is true about the marbles when they reach the ground?

The two marbles are moving with the same speed.

The marble that rolled down the ramp is moving faster than the marble that fell.

The marble that fell down the back of the ramp is moving faster than the marble that rolled.

The marble that rolled down the ramp is not moving when it reaches the ground.

Work, energy and power

Authored by Dhanunjay Palla

Physics

9th Grade

NGSS covered

Used 29+ times

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

Work divided by time equals...

energy

power

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The unit of work is the ...

joule

force

The unit of power is the...

work

watt

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Force multiplied by distance equals...

work

power

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Work is done on an object when the object moves in the SAME direction in which the force is applied.

True

False

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If you pull at an angle instead of in the direction in which the object moves, MORE of your force does work.

True

False

The FARTHER you move an object, the more work you do.

True

False

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Work, energy and power

Work divided by time equals...

The unit of work is the ...

The unit of power is the...

Force multiplied by distance equals...

Work is done on an object when the object moves in the SAME direction in which the force is applied.

If you pull at an angle instead of in the direction in which the object moves, MORE of your force does work.

The FARTHER you move an object, the more work you do.

The more POWER you use to move an object, the more work you do.

If you lift a box from the floor to a height of 1m and then carry the for for 10m, you do work only when you CARRY the box.

Power is the RATE at which work is done.

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