Work, Power, Energy Refresher

Force is a ______ or ______ applied on an object.

• push, pull

• position , location

• motion, rest

Tags

NGSS.MS-PS2-1

_____ is said to be done when force moves an object.

• work

• energy

• motion

Tags

NGSS.MS-PS3-5

The ability or capacity to do work is called _____.

• energy

• force

• work

Tags

NGSS.MS-PS3-5

Work is done when a force causes an object to ...

• move
• stay still
• slow down

Tags

NGSS.MS-PS3-5

In which scenario is work = 0 J ?

• Pushing a stationary wall

• Pulling a trolley car

• Pushing a book across the table

• Dropping a set of keys from a height, h.

If the force on an object is in the negative direction, the work it does on the object must be

• zero

• positive

• nagative

• The work could be either positive or negative, depending on the direction of the object's motion.

What is needed to calculate work?

• force

• distance

• time

• mass

Select all: Work is equal to...

• KE + PE

• Change in energy

• mg

• Fd

Tags

NGSS.MS-PS3-5

Bobby lifts a book to the second floor in 20 seconds. Carol lifts the same book to the second floor in 10 seconds. Who did more work?

• Bobby

• Carol

• They did the same amount of work

• Not enough information

Tags

NGSS.MS-PS3-2

A girl weighs 400 N. She runs up a flight of stairs of height 5 m in 4 seconds. Her power is:

• 320 W

• 400 W

• 500 W

• 2 000 W

Tags

NGSS.MS-PS2-4