# Chapter 7 Review: Question Preview (ID: 31670)

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**What direction does force need to act to produce the greatest amount of work?**

a) perpendicular to the direction of motion

b) in the same direction of the motion

c) against the motion

d) at a 45* angle of the motion

**A car jack exerts a force of 4000 to raise a car 1.2 meters. The amount of work done by the jack is _____Joules**

a) 0

b) 3333

c) 4800

d) 10200

**The action that would require no work to be done is**

a) pushing a cart of the hill

b) holding your textbook

c) throwing a baseball

d) lifting a balloon from the floor to the table

**A 60 N block is pushed up of ramp that is 4 meters long and 3 meters tall. The amount of work done against gravity is ______ joules**

a) 0

b) 45

c) 180

d) 360

**when work is done on an object, causing the object to move, the object gains**

a) kinetic energy

b) mechanical advantage

c) efficiency

d) friction

**An electric heater raises the temperature of water by adding 5250 J of energy to the water in 20 seconds. What is the needed power for this to happen?**

a) 105,000 watts

b) 6500 watts

c) 262.5 watts

d) 0

**Running up a flight of stairs, Maria generates 350 watts of power. If it took her 7 seconds to climb the stairs, how much work did she do?**

a) 6 j

b) 50 j

c) 2450 j

d) 3900 j

**A car has a mass of 6200 kg and is moving at a velocity of 15 m/s. A 20,000 N force is used to move the car 34.85 m. What is the car's kinetic energy?**

a) 15,000 j

b) 93,000 j

c) 697,500 j

d) 1,395,000 j

**what is the unit of measurement for power?**

a) watt

b) joule

c) newton

d) power does not have a unit

**what is the unit of measurement for work**

a) watt

b) joule

c) newton

d) work does not have a unit

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