Quiz about Unit 9 Machines Test Review

Question 1

In which of the following situations do your arms do work on books?

Accepted Answer

picking up a pile of books from the floor

Answer

holding a heavy stack of books while standing

Answer

carrying a heavy stack of books

Answer

dropping a stack of books onto a table

Question 2

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

Accepted Answer

0 J

Answer

15 J

Answer

45 J

Answer

5 J

Question 3

Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.

Accepted Answer

1800 J

Answer

1600 J

Answer

160 J

Answer

3600 J

Question 4

A flat sloping surface that connects lower and higher elevations. It makes raising objects easier.

Accepted Answer

inclined plane

Answer

wedge

Answer

screw

Answer

lever

Question 5

An inclined plane wrapped around a rod forms this simple machine

Accepted Answer

screw

Answer

lever

Answer

pulley

Answer

wedge

Question 6

An axe is an example of a

Accepted Answer

wedge

Answer

pulley

Answer

inclined plane

Answer

screw

Question 7

The transfer of energy that occurs when a force makes an object move is known as

Accepted Answer

work

Answer

effort

Answer

potential

Answer

kinetic

Question 8

Which of the following does a simple machine do?

Accepted Answer

all of the above

Answer

allows the users to apply less force over a longer distance

Answer

reduce the amount of force needed to do work

Answer

change the direction of the applied force

Question 9

ADV: During a pull-up, a 90 kg man raises himself by 80 cm. Calculate the work done in a single pull-up.

Accepted Answer

720 Joules

Answer

72,000 Joules

Answer

1,125 Joules

Answer

112,500 Joules

Question 10

Work output can never be ________ than work input.

Accepted Answer

greater

Answer

work

Answer

distance

Answer

work output

Answer

work input

Question 11

Machines aren't 100% efficient because of

Accepted Answer

friction

Answer

ideal machine

Answer

oil

Question 12

ADV: A load of 650 newtons is lifted with this pulley. What is the effort required to do this work?

Accepted Answer

325

Answer

300

Answer

600

Answer

650

Question 13

ADV: An effort of 450 newtons is applied to this pulley. What is the force of the load that will be lifted?

Accepted Answer

900

Answer

450

Answer

600

Answer

750

Question 14

What is the mechanical advantage of this pulley system?

Accepted Answer

6

Answer

4

Answer

8

Answer

10

Question 15

What is the mechanical advantage of this pulley?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 16

What is the mechanical advantage of this pulley?

Accepted Answer

5

Answer

3

Answer

4

Answer

6

Question 17

How can you decrease the effort force needed to push a weight to the top of the ramp?

Accepted Answer

increase the length of the ramp

Answer

cover the surface with carpet

Answer

increase the height of the ramp

Answer

decrease the length of the ramp

Question 18

If you push a coffee mug 1.4 m using a force of 5 N, the work done on the mug is?

Accepted Answer

7 J

Answer

6 J

Answer

8 J

Answer

9 J

Question 19

Tamara rides her skateboard 15 meters up a ramp to a height of 5 meters above ground. What is the ideal mechanical advantage of the ramp?

Accepted Answer

3

Answer

0.5m

Answer

1.5m

Answer

3m

Question 20

Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?

Accepted Answer

10

Answer

1

Answer

100

Answer

1000

Question 21

An axle is 4 meters and the wheel is 8 meters. What is the mechanical advantage?

Accepted Answer

2

Answer

32

Answer

.5

Question 22

Name the class of lever.

Accepted Answer

Class 1

Answer

Class 2

Answer

Class 3

Answer

Class president

Question 23

What is the mechanical advantage for this lever?

Accepted Answer

2

Answer

1

Answer

1/2

Answer

8

Question 24

How do you calculate the MA of a lever?

Accepted Answer

Effort arm length / Resistance arm Length

Answer

Effort arm length X Resistance arm Length

Answer

Resistance arm / effort arm

Answer

output X input

Question 25

Work is done when

Accepted Answer

a force acts on an object and the object moves in the same direction.

Answer

a force acts on an object.

Answer

the mass of an object changes.

Answer

the velocity of an object changes.

Question 26

Simple machines cannot increase the amount of work done, but they can -

Accepted Answer

change the size and direction of the force applied.

Answer

decrease the work completed.

Answer

increase man power.

Answer

make the person applying the force stronger.

Question 27

Effort between fulcrum and resistance.

Accepted Answer

third-class lever

Answer

first-class lever

Answer

second-class lever

Question 28

A 62 kg box is lifted 12 m off the ground. How much work was done? (hint: calculate weight of the box first)

Accepted Answer

7291.2 J

Answer

5.17 J

Answer

72.91 J

Answer

744.0 J

Question 29

How does a single fixed pulley, like the one seen here, help you do work?

Accepted Answer

changes the direction of the force

Answer

increases the amount of applied force

Answer

decreases the amount of applied force

Answer

allows you to pull the rope a shorter distance

Question 30

The mechanical advantage of this inclined plane is.....

Accepted Answer

2.4

Answer

3.4

Answer

4.4

Question 31

Jeff is a landscaping contractor and lifts a rock weighing 600 Newtons by wedging a board under the rock. Jeff weighs 150 Newtons and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?

Accepted Answer

4

Answer

0

Answer

2

Answer

8

Question 32

How could I reduce the effort force needed to lift the load?

Accepted Answer

move the fulcrum closer to the load

Answer

move the fulcrum away from the load

Answer

place the fulcrum in the middle

Question 33

Which of the following is true for the picture?

Accepted Answer

triangle is the fulcrum, mouse is the effort, elephant is the load

Answer

elephant is the fulcrum, mouse is the effort, triangle is the load

Answer

mouse is the fulcrum, triangle is the effort, elephant is the load

Question 34

An object being lifted or moved is a

Accepted Answer

load

Answer

fulcrum

Answer

force

Answer

simple machine

Question 35

The greatest amount of force is required to move the metal block up which inclined plane?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 36

Calculate the amount of work done if you use a 100N force to push a 50 kg box 5 m across the kitchen floor.

Accepted Answer

500 J

Answer

250 J

Answer

5000 J

Answer

50,000 J

Question 37

You push on a car and it does not move.  What is true about the inertia?

Accepted Answer

The inertia of the car is too great

Answer

The inertia is changing

Answer

The inertia of the person is equal to the car

Answer

There is not inertia because of no movement

Question 38

As an object's mass increases, its gravitational pull will ____________.

Accepted Answer

increase

Answer

decrease

Answer

stay the same

Answer

get weaker

Question 39

If weight on Earth = 54 N, mass =

Accepted Answer

5.50 kg

Answer

530 kg

Answer

54 kg

Answer

5.05 kg

Question 40

ADV: The mass of a book on a table is 1.2 kg. The normal force on the book is

Accepted Answer

11.8 N

Answer

0.12 N

Answer

1.2 kg

Answer

1.2 N

Question 41

You and your dad are moving the couch from one side to another. Your dad pushes with a force of 35 N to the right and you push with a force of 25 N right. What is the net force on the couch?

Accepted Answer

60 N right

Answer

10 N left

Answer

60 n right

Answer

50 N left

Question 42

A mouse is pulling a piece of cheese with the force of 40 N to the left.  A rat sees him and trots over to grab the cheese too and pulls with a force of 60.5 N to the right.  What is the net force?

Accepted Answer

20.5 N Right

Answer

20.5 N Left

Answer

20 N Right

Answer

20 N left

Question 43

If a 10 kilogram object accelerates suddenly at 15 m/s², how much force was applied to the object?

Accepted Answer

150 Newtons

Answer

15 Newtons

Answer

150 kilograms

Answer

100 kilograms

Question 44

A 5 kg block is pulled across a table by a horizontal force of 40 N with a frictional force of 8 N opposing the motion. Calculate the acceleration of the object.

Accepted Answer

6.4 m/s2

Answer

8 m/s2

Answer

1.6 m/s2

Answer

9.6 m/s2

Question 45

Name the missing force...

Accepted Answer

applied force

Answer

weight force

Answer

tension force

Answer

drag

Question 46

An empty truck and a fully loaded truck are next to each other at a traffic light. When the light turns green, the lighter truck increases speed more quickly. Which of these best explains this situations

Accepted Answer

Newton's second law

Answer

Newton's first law

Answer

Newton's third law

Answer

Conservation of momentum

Question 47

A Mini Cooper car has a mass of 1300 kg. A Ford F350 truck has a mass of 7700 kg. Which vehicle has more inertia?

Accepted Answer

Ford F350 because it has more mass

Answer

Mini Cooper, because it has less mass

Answer

Not enough information is given

Question 48

The Earth exerts a force downward on you. What is the 3^rd Law of Motion reaction force?

Accepted Answer

You exert an upward force on the Earth

Answer

You exert a downward force on the Earth

Answer

The Earth exerts an upward force on you

Answer

Not enough information given

Unit 9 Machines Test Review

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