# Work And Power: Question Preview (ID: 8763)

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**Work occurs when**

a) something moves

b) something moves in the direction of the force

c) something moves against the direction of the force

d) something stays still

**Which of the following does NOT demonstrates work?**

a) Carrying a backpack to class

b) Lifting your books off a desk

c) Pushing a cart through a store

d) Pulling a suitcase through the airport

**What is the formula used to calculate work?**

a) distance divided by time

b) joules multiplied by watts

c) force multiplied by distance

d) force added to force

**The newton-meter is the unit used to describe force. What is its synonym?**

a) watt

b) newton

c) joule

d) power

**Cmdr. Data used 2 N of force to lift his cat, Spot, 1.5 meters from the floor to his sofa. How much work did he do?**

a) 3 joules

b) .75 joules

c) 30 joules

d) No joules because no work was actually being completed.

**The rate at which work is done is known as**

a) time

b) power

c) joules

d) newton-meters

**The formula for power is**

a) force multiplied by distance

b) time divided by work

c) joules multiplied by time

d) work divided by time

**Power is measured by joules per second. What is a synonym for this measurement?**

a) joule

b) ampere

c) watt

d) meter/second

**How much power is used if it takes Lt. Cmdr. Worf 10 seconds to complete 35 joules of work?**

a) 350 watts

b) 45 watts

c) 25 watts

d) 3.5 watts

**Kirk and Spock race to move identical boxes the same distance. Spock finishes first. How can this happen?**

a) Spock is a Vulcan, and he tricked Kirk.

b) Kirk used less time than Spock.

c) Spock used more power than Kirk.

d) Kirk has more power than Spock.

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