Quiz about Work and Machines Quiz Review

Question 1

In order for work to be done on an object, the object must __________________.

Accepted Answer

move some distance in the direction of the force applied to it

Answer

not move at all

Answer

move some distance in the opposite direction of the force applied to it

Question 2

The rate at which work is done is called ____________.

Accepted Answer

power

Answer

force

Answer

mechanical advantage

Answer

efficiency

Question 3

The unit for work is called a

Accepted Answer

Joule

Answer

Newton

Answer

Joule-meter

Answer

Watt

Question 4

The unit for force is called a

Accepted Answer

Newton

Answer

Joule

Answer

Joule-meter

Answer

Watt

Question 5

The force you exert on a machine is called

Accepted Answer

input force

Answer

output force

Question 6

A machine's _______________ is the number of times the machine increases a force exerted on it.

Accepted Answer

mechanical advantage

Answer

input force

Answer

efficiency

Answer

output force

Question 7

What is output work?

Accepted Answer

work a machine does on an object

Answer

work you do on a machine

Answer

work a machine does on you

Answer

work the object does on a machine

Question 8

A machine can not change the ________________________.

Accepted Answer

amount of work needed to do a task

Answer

direction of the input force

Answer

distance over which a force is applied

Answer

amount of force needed to do a task

Question 9

What is the efficiency of an ideal machine?

Accepted Answer

equal to 100%

Answer

greater than 100%

Answer

less than 100%

Question 10

The force a machine applies to an object is called _______________.

Accepted Answer

output force

Answer

input force

Question 11

The mechanical advantage of a pulley (changes direction of input force) is _______________________.

Accepted Answer

equal to 1

Answer

less than 1

Answer

greater than 1

Question 12

Carrying a heavy box from one room to another

Accepted Answer

no work

Answer

work

Question 13

Without friction there would be ____________________________.

Accepted Answer

equal input and output work

Answer

greater output work than input work

Answer

greater input work than output work

Question 14

What factor is being changed?

Pulling a rope to raise a flag up a flagpole

Accepted Answer

direction of the force exerted

Answer

amount of force exerted

Answer

distance over which force is exerted

Question 15

Putting your dirty clothes in your hamper

Accepted Answer

work

Answer

no work

Question 16

If the output force is greater than the input force, the mechanical advantage of a machine will be

Accepted Answer

greater than 1

Answer

equal to 1

Answer

less than 1

Question 17

The mechanical advantage of chopsticks (changes distance) is __________________.

Accepted Answer

less than 1

Answer

equal to 1

Answer

more than 1

Question 18

Taking your books out of your locker

Accepted Answer

work

Answer

no work

Question 19

What factor is being changed?

Using a hammer to put a nail into the wall

Accepted Answer

amount of force exerted

Answer

distance over which force is exerted

Answer

direction of force exerted

Question 20

You are using a shovel to dig a hole in the ground...

What is the input distance?

Accepted Answer

how far the shovel moves

Answer

how far the dirt moves

Answer

force you exert on the shovel

Answer

force the shovel exerts on the dirt

Question 21

The mechanical advantage of a sledgehammer (multiplies force) is _____________________.

Accepted Answer

greater than 1

Answer

equal to 1

Answer

less than 1

Question 22

You use a screwdriver to pry open the lid of a paint can.

What is the output force?

Accepted Answer

the force the screwdriver exerts on the lid

Answer

how far the the lid moves up

Answer

the force you exert on the screwdriver

Answer

how far the screwdriver moves to lift the lid

Question 23

Which factor is being changed?

Pulling a bar down to lift weights up

Accepted Answer

the direction of the force exerted

Answer

the amount of force exerted

Answer

the distance over which the force is exerted

Question 24

You are shoveling mulch from your driveway to fill a wheelbarrow.

What is the output distance?

Accepted Answer

how far the mulch moves

Answer

how far the shovel moves

Answer

force you exert on the shovel

Answer

force the shovel exerts on the mulch

Question 25

If the output force (OF) is greater than the input force (IF), the mechanical advantage (MA) will be _______________.

Accepted Answer

greater than 1

Answer

equal to 1

Answer

less than 1

Question 26

Kicking a soccer ball

Accepted Answer

work

Answer

no work

Question 27

You hammer a nail into a wall

What is the input force?

Accepted Answer

the force you exert on the hammer

Answer

how far the nail goes into the wall

Answer

the force the hammer exerts on the nail

Answer

how far the hammer moves to hit the nail

Question 28

If the input force (IF) is greater than the output force (OF), the mechanical advantage (MA) will be ____________________.

Accepted Answer

less than 1

Answer

equal to 1

Answer

greater than 1

Question 29

The comparison of a machine's output work to its input work is called ___________________.

Accepted Answer

efficiency

Answer

mechanical advantage

Answer

output force

Answer

input distance

Question 30

If the output force (OF) is equal to the input force (IF), the mechanical advantage will be ____________________.

Accepted Answer

equal to 1

Answer

less than 1

Answer

greater than 1

Question 31

A force of 12 N is used to lift a box 0.5 meters above a floor. What amount of work was done to lift the box?

Accepted Answer

6.0 N/m

Answer

11.5 N

Answer

12.5 N

Answer

24.0 N/m

Question 32

True or False:

A man would do more work if he pushes a box up a ramp faster.

Accepted Answer

False

Answer

True

Question 33

Which is the product of the output force and the distance over which the output force is applied?

Accepted Answer

output work

Answer

machine

Answer

input work

Answer

mechanical advantage

Question 34

What do you divide work by to calculate power?

Accepted Answer

time

Answer

distance

Answer

force

Answer

weight

Question 35

A unit of work equal to one Newton-meter.

Accepted Answer

joule

Answer

watt

Answer

pascal

Answer

psi

Question 36

What unit is used to express power?

Accepted Answer

Watt

Answer

Joule

Answer

Work

Answer

Newton

Question 37

Why is the output work of a machine always less than the input work?

Accepted Answer

some work is used to overcome the force of friction

Answer

some work is used to start the machine

Answer

some work is used to keep the machine running

Answer

work output is always more than work input

Question 38

What is the equation for power?

Accepted Answer

P = Work/time

Answer

P = Force/time

Answer

P = time/distance

Answer

P = Work * time

Question 39

A machine ________ the amount of work you do.

Accepted Answer

does not change

Answer

decreases

Answer

changes

Answer

increases

Question 40

In which of these scenarios is work being done?

Accepted Answer

a student carries his chair into another room

Answer

a student sleeps

Answer

a student pushes a locked door that does not move

Answer

a student sits on the carpet

Work and Machines Quiz Review

40 questions

In order for work to be done on an object, the object must __________________.

The rate at which work is done is called ____________.

The unit for work is called a

The unit for force is called a

The force you exert on a machine is called

A machine's _______________ is the number of times the machine increases a force exerted on it.

What is output work?

A machine can not change the ________________________.

What is the efficiency of an ideal machine?

The force a machine applies to an object is called _______________.

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