Physics: Power Thur 01/13

Physics: Power

Thursday 01/13

By Jessica Arthur

Multiple Choice

The ability to do work is _?_

• force

• power

• energy

• kinetics

Fill in the Blanks

Besides mechanical energy (which is what we are discussing in this chapter), list another form of energy. Use proper science terms and spelling.

Multiple Choice

True/False: The work of friction always removes energy from a system.

• True

• False

Multiple Choice

Work of friction formula

• Fd

• ukm x d

• uk x d

• ukFn

Multiple Choice

On a level surface, such as a road, you can assume the PE is _?_

• equal to KE

• PE + KE

• less than KE

• zero

Multiple Choice

If an object is at rest on the top of the hill, you can assume the KE is _?_.

• equal to PE

• Less than PE

• KE + PE

• zero

Multiple Select

If an object is at stops at the bottom of a hill, you can assume the _?_ is equal to zero.

• TMEafter

• TMEbefore

• PE

• Wf

Fill in the Blanks

If displacement is equal to zero, then power is equal to _?_.

Multiple Choice

In order to calculate power, then time must be in _?_.

• hours

• minutes

• seconds

• any unit

Multiple Choice

In order to calculate power, then displacement just be in what unit?

• km

• m

• cm

• any unit

Multiple Choice

J/s is _?_.

• Watts

• calorie

• horsepower

• J/s (no special unit)

Open Ended

In the solution to the example problem (1.8 W) how does this compare to an average light bulb's wattage (60 W)?

Fill in the Blanks

55-kg (540 N) person runs up the stairs 10. meters high in 2 .0 minutes. The first step is to convert time into _?_.

Fill in the Blanks

55-kg (540 N) person runs up the stairs 10. meters high in 2 .0 minutes. After converting 2.0 minutes to seconds (120 s), determine the power. Be sure to maintain proper SDs.