Work vs Power

The formula for power is

• work/time (P = W/t)

• force × distance (W = Fd)

• distance/time (s = d/t)

• mass × acceleration (F = ma)

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Work is done when which two things happen?

• an object is moved

• power is converted into Newtons

• an object has been subjected to force (unbalanced)

• an object stays in place

Tags

NGSS.MS-PS3-5

Use one of these equations to answer this question (W = Fd) and (P = W/t): Toph pushes against the turret with 500 Newtons of Force. It stays in place. How much work has been done?

• 1200 Joules of work

• 500 Joules of work

• No work has been done

• 200,000 Joules of work

In which of these cases is work being done? 

• A student sleeps all night.

• A student pushes a locked door that does not move.

• A student carries his chair into another room.

• A student sits on the carpet.

The formula for work is

• work/time (P = W/t)

• force × distance (W = Fd)

• distance/time (s = d/t)

• mass × acceleration (F = ma)

Tags

NGSS.MS-PS2-2

Which of the following scenarios best illustrates the concept of work in physics?

• A person reading a book.

• A person pushing a stalled car.

• A person sitting on a bench.

• A person thinking about a math problem.

What is the SI unit of power?

• Joule

• Watt

• Newton

• Pascal

If a machine does 500 Joules of work in 10 seconds, what is its power output?

• 50 Watts

• 5 Watts

• 5000 Watts

• 0.5 Watts

Which of the following statements is true about work and power?

• Power is the rate at which work is done.

• Work is the rate at which power is used.

• Power and work are the same.

• Work is always greater than power.

Tags

NGSS.MS-PS3-5

• 980 Watts

• 196 Watts

• 490 Watts

• 49 Watts

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5