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Chapter Test C
Work and Machines
22
Science
03/20/2013

Term
 What is it called when a force causes an object to move in the direction of the force?
Definition
 work
Term
 What is the rate at which power is transferred?
Definition
 energy
Term
 What do you call the number of times a machine multiplies force?
Definition
Term
 What is a machine that is made of two simple machines?
Definition
 compound machine
Term
 What is a machine with a grooved wheel that holds a cable?
Definition
 pulley
Term
 What kind of energy does a moving object have?
Definition
 kinetic
Term
 What is the comparison of a machines's work output with work input called?
Definition
 mechanical efficiency
Term
 What is the product of input force through a distance?
Definition
 work input
Term
 What is a machine with a bar that pivots on a fixed point?
Definition
 lever
Term
 What is the product of output force throught a distance?
Definition
 work input
Term
 What is the name of the unit used to express power?
Definition
 watt
Term
 What is a device that makes work easier?
Definition
 machine
Term
 What is the name of the unit used to express work?
Definition
 joule
Term
 This machine has two circular devices of different sizes.
Definition
 wheel and axle
Term
 A moving bowling ball has what kind of energy?
Definition
 kinetic
Term
 Force times what is the formula to calculate work.
Definition
 distance WORK = Force x Distance
Term
 You need the same amount of what to raise a car up a cliff as to push it up a hill.
Definition
 work
Term
 These aren't 100% efficient because of friction.
Definition
 machines
Term
 A machine that had 100% mechanical efficiency would be a(an) what?
Definition
 ideal machine
Term
 This is a picture of a first-class lever.
Definition
 The fulcrum is in the center and the load is near the center.
Term
 This is a picture of a second-class lever.
Definition
 The fulcrum is at one end, the load is near it and the input force is on the other end.
Term
 This is a picture of a third-class lever.
Definition
 The fulcrum is on one end and the load is on the opposite end.
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