Quiz about Work and Simple Machines Practice

Question 1

The use of force to move an object is called

Accepted Answer

work

Answer

energy

Answer

force

Answer

power

Question 2

For work to be done, the _____________________ must be applied in the same direction that the object moves.

Accepted Answer

force

Answer

energy

Answer

power

Answer

distance

Question 3

A _________________________ is any device that makes work easier by changing a force.

Accepted Answer

machine

Answer

chemical reaction

Answer

turbine

Answer

force

Question 4

Machines do not increase or decrease the amount of ______________ that is done. They just change how the _______________ is done.

Accepted Answer

work, work

Answer

power, power

Answer

height, height

Answer

distance, distance

Question 5

Identify the type of simple machine shown.

Accepted Answer

lever

Answer

pulley

Answer

inclined plane

Answer

wedge

Question 6

Identify the type of simple machine shown.

Accepted Answer

pulley

Answer

wheel and axle

Answer

lever

Answer

screw

Question 7

Identify the type of simple machine shown.

Accepted Answer

wedge

Answer

inclined plane

Answer

lever

Answer

pulley

Question 8

Identify the type of simple machine shown.

Accepted Answer

inclined plane

Answer

wedge

Answer

lever

Answer

screw

Question 9

Identify the type of simple machine shown.

Accepted Answer

screw

Answer

wedge

Answer

inclined plane

Answer

lever

Question 10

Identify the type of simple machine shown.

Accepted Answer

wheel and axle

Answer

pulley

Answer

wedge

Answer

screw

Question 11

_____________________________ is the ratio of the output force to the input force.

Accepted Answer

Mechanical advantage

Answer

Efficiency

Answer

Work

Answer

Power

Question 12

Work is measured in

Accepted Answer

joules (J)

Answer

kilograms (kg)

Answer

meters (m)

Answer

Newtons (N)

Question 13

Weight is measured in

Accepted Answer

Newtons (N)

Answer

kilograms (kg)

Answer

joules (J)

Answer

meters (m)

Question 14

Mass is measured in

Accepted Answer

kilograms (kg)

Answer

joules (J)

Answer

meters (m)

Answer

Newtons (N)

Question 15

Distance is measured in

Accepted Answer

meters (m)

Answer

kilograms (kg)

Answer

joules (J)

Answer

Newtons (N)

Question 16

_____________________ is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work).

Accepted Answer

Efficiency

Answer

Power

Answer

Work

Answer

Mechanical advantage

Question 17

The output work is always _________________ the input work because some of the input work is used to overcome friction.

Accepted Answer

less than

Answer

more than

Answer

equal to

Question 18

How much work is done to move a 4 N rock 10 meters? W = Fd

Accepted Answer

40 J

Answer

0.4 J

Answer

2.5 J

Answer

400 J

Question 19

What is the Ideal Mechanical Advantage of the pulley shown. (Count the supporting ropes.)

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 20

What is the Ideal Mechanical Advantage of the pulley shown. (Count the supporting ropes.)

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 21

What is the Ideal Mechanical Advantage of the pulley shown. (Count the supporting ropes.)

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 22

What is the weight of a book that has a mass of 2.0 kg? W= mg

Accepted Answer

20 N

Answer

2.0 N

Answer

4.0 N

Answer

200 N

Question 23

If a device uses 1000 J of energy but only 200 J is used for useful work, what is the efficiency of the device?

Accepted Answer

20%

Answer

5%

Answer

80%

Answer

95%

Question 24

What is the efficiency of a system that requires 500 J of energy to do 250 J of useful work?

Accepted Answer

50%

Answer

25%

Answer

75%

Answer

100%

Question 25

Energy due to motion is ____________ energy.

Accepted Answer

Kinetic

Answer

Potential

Answer

Energy

Answer

Friction

Question 26

__________ is stored energy.

Accepted Answer

Potential

Answer

Kinetic

Answer

None of the above

Answer

All of the above

Question 27

At which point is potential energy greatest?

Accepted Answer

W

Answer

X

Answer

Y

Answer

Z

Question 28

At which point is kinetic energy greatest?

Accepted Answer

X

Answer

W

Answer

Y

Answer

Z

Question 29

A 0.40 kilogram bird is flying at a constant speed of 8.0 m/s. What is the bird's kinetic energy ?

Accepted Answer

12.8 J

Answer

3.2 J

Answer

4.2 J

Answer

2.0 J

Question 30

Determine the gain in gravitational potential energy when a 4.0 kg block is raised 18 m. Gravity is 9.8m/s.

PE = mgh

Accepted Answer

706 J

Answer

72 J

Answer

7056 J

Answer

176 J

Work and Simple Machines Practice

34 questions

The use of force to move an object is called

For work to be done, the _____________________ must be applied in the same direction that the object moves.

A _________________________ is any device that makes work easier by changing a force.

Machines do not increase or decrease the amount of that is done. They just change how the _ is done.

Identify the type of simple machine shown.

Identify the type of simple machine shown.

Identify the type of simple machine shown.

Identify the type of simple machine shown.

Identify the type of simple machine shown.

Identify the type of simple machine shown.

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