Work and Power

What is an equivalent formula for force?

• $F=d\times t$

• $a=\frac{F}{m}$

• $F=\frac{W}{d}$

• $m=F\times a$

Tags

NGSS.MS-PS2-2

Work is measured in which units?

• Newtons

• Joules

• Watts

• Joule/sec

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

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 work done on the block

• the power applied to the block

• the impulse applied to the block

Tags

NGSS.MS-PS3-5

Power is measured in which units?

• Newtons

• Joules

• Watts

• Joule/sec

Tags

NGSS.MS-PS3-5

Which of the following is a true statement about work?

• It measures how quickly an object accelerates 
• It measures how much effort is applied over a certain distance
• It measures the change in an object's rate of speed
• It measures how much time it takes to move a massive object

____ is being done when a force is exerted on a wagon while it is being pulled up a hill.

• Power

• Force

• Work

Tags

NGSS.MS-PS2-4

Which of these is a measure of force?

• 100 newtons
• 100 meters per second
• 100 joules
• 100 watts

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

A strongman exerts 1500 N on the side of a building. After 2 minutes, the building doesn't move. How much work did he do?

• 180,000 J

• 0 J

• 750 J

• 1500 J

You use 950 J of energy to push a sofa. If it took you 5 sec to move the sofa, what was your power?

• 190 J

• 4750 J

• 4750 W

• 190 W

If 360 J of work is needed to move a crate a distance of 4 m, what is the weight of the crate?

• 90 N

• 720 N

• 90 kg

• 720 W

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4