Chapter 9

Front 1

a__________ is an inclined plane wrapped around a cylinder.

Back 1

screw

Front 2

__________is a quatity that measures the rate at which work is done.

Back 2

power

Front 3

a ________is defined as a machine made up of more than one simple machine.

Back 3

compound machine

Front 4

The sum of the kinetic and potential enery of large-scale objects in a system is called____________.

Back 4

mechanical energy

Front 5

Power is calculated by dividing work by___________

Back 5

time

Front 6

all levers have a rigid arm that turns around a point called the ________

Back 6

fulcrum

Front 7

_________is the stored energy resulting from the relative positions of objects in a system.

Back 7

potential energy

Front 8

Horsepower is the common unit of power in rating engines. However, the official SI unit of power is the _____

Back 8

watts

Front 9

________ is the energy of a moving object due to its motion.

Back 9

kinetic energy

Front 10

____________is a quatity that measures how much a machine multiplies force or distance.

Back 10

mechanical advantage

Front 11

The formula for calculating kinetic energy can be written as __________

Back 11

KE= one half mv2

Front 12

A pendulum is swinging back and forth and has a kinetic energy of 400 j at a particular point in its path. what is not true.

Back 12

both the kenetic and potential energy are decreasing

Front 13

which of the following is not a simple machine?

Back 13

a pair of scissors

Front 14

an inclined plane does what?

Back 14

changes both the magnitude and the direction of the force.

Front 15

IF the kinetic energy of an object decreases , the nonmechanical energy will decrease? true or false

Back 15

false

Front 16

what are the units of power?

Back 16

joules per second, watts, horsepower. all of the above

Front 17

a machine is a divice that

Back 17

can multiply and change the direction of an imput force.

Front 18

which of the following statments about work and energy is not true

Back 18

work and energy are always equal

Front 19

which of the following is an example of a wheel and axle?

Back 19

a screwdriver

Front 20

the law of conservation of energy states that

Back 20

energy can neither be created or destroyed

Front 21

which of the following is a compound machine?

Back 21

a pair of pliers

Front 22

the kind of energy associated with atomic bonds is

Back 22

chemical energy

Front 23

a wheelbarrow is an example of

Back 23

a hand-held boat paddle

Front 24

what are the units of work?

Back 24

all of the above

Front 25

gravitational potential energy depends on the

Back 25

all of the above