Force, Motion, Work, and Power Review

Choose the words that correctly complete the paragraph.

Deanna’s niece loves to swing at the local playground, so Deanna takes her and pushes her on the swing. Deanna must use ____________to exert a ____________ that causes the swing to change ____________.

• force, energy, motion

• motion, force, energy

• energy, force, motion

Tags

NGSS.MS-PS3-5

Four students are each pushing on one side of a box. Mara is pushing to the west, Cindi is pushing to the east, Chris is pushing to the north, and Sammy is pushing to the south. If the box moves to the east, which student does work on the box?

• Mara

• Cindi

• Chris

• Sammy

Marissa uses a cart to haul flowers at her job with a landscaper. She pushes a 12-kilogram cart a distance of 6 meters with a force of 25 Newtons. How much work does she do?

• 4.25 J

• 150 J

• 150m

• 1800 J

Chad’s family just moved into a new home. The sun went down as Chad was moving boxes into the house, so he had to turn on a light to see. Which statements are true about the power Chad used? Choose the two statements that apply.

• the power he used to move the boxes can be found by determining the rate at which work was done on the boxes.

• The power Chad used to move the boxes is the force he used times the distance he moved them.

• The power of the light Chad turned on is the amount of energy changed from electricity to light.

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

Tags

NGSS.MS-PS3-5

Raul dug a hole in his yard to repair a water pipe. It took him 2 seconds to apply a force of 50 Newtons to push the shovel 0.25 m into the ground. How much power was used?

• 0.01 watts

• 6.25 watts

• 25.00 N•m•s

• 100.00 watts

Colin is helping the librarian return books to the shelves where they belong. He picks up books from the librarian’s desk, as shown in Figure A. He then carries them to the shelves, as shown in Figure B. In which figure does Colin do work?

• Figure A

• Figure B

• Both Figure A and B

• Neither Figure A or B

The rate at which work is done is:

• energy

• power

• motion

• work

How is work related to Energy?

• when you do work on an object, some of your energy is transferred to that object

• doing work created energy

• energy is lost when doing work

• when you do work, energy is created

Tags

NGSS.MS-PS3-5

For work to be done, the force and motion must:

• be going in different directions

• be the same

• be moving in the same direction

• have a net force of 0 N

The amount of work you do on something depends on the ___________ of the force and the object's _____________.

• speed, motion

• motion, power

• direction, power

• direction, motion

Tags

NGSS.MS-PS3-5