Power questions

The equation for POWER is

• power = mass x time

• power = energy / time

• power = time / work

• power = work x time

What is the difference between calculating power and work?

• Power takes into account the time it takes to complete a task
• Work takes into account the time it takes to complete a task
• Power is force/area
• Work is force/area

Energy that is stored in bonds between atoms is:

• Mechanical energy
• Chemical energy
• Kinetic energy
• Nuclear energy

Tags

NGSS.MS-LS1-7

NGSS.MS-PS3-2

Rank in order, from largest to smallest, the gravitational potential energies of the balls.

• 1 > 2 = 4 > 3

• 1 > 2 > 3 > 4

• 3 > 2 = 4 > 1

• 3 > 2 > 4 > 1

A rock has 10 J of potential energy on top of a roof. If it is dropped and lands with only 8 joules of kinetic energy, how much work did air resistance do on the rock?

• -18 J

• -10 J

• -8 J

• -2 J

Which requires more power – a person walking up stairs or a person running up stairs?

• walking

• running

• they require equal power output

• no power is required at all

A basketball that is dropped bounces back up to its original height. Pick the correct energy transformation from the point when it was dropped until it returns to the original height.

• KE --> PE --> Elastic

• PE --> KE --> Elastic --> KE --> PE

• KE --> PE --> Elastic --> PE --> KE

• Elastic --> PE --> KE --> Elastic

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

• 400 W

• 1000 W

• 1600 W

• 4000 W

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

________________ is the rate at which work is done.

• Power

• Work

• Time

• Energy

Tags

NGSS.MS-PS3-5

The unit of power (aka Joule per second)

• Joule

• Minute

• Watt

• Pound