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Energy and Machines

Total questions: 80

Worksheet time: 1hrs 1mins

Name
Class
Date
1.

Tools and machines make our lives....

a)

hard

b)

difficult

c)

easier

d)

funny

2.
a)

Pulley

b)

Inclined plane

c)

Lever

3.
a)

Wedge

b)

Wheel and axle

c)

Screw

4.
a)

Pulley

b)

Lever

c)

Wedge

5.
a)

Wheel and axle

b)

Inclined plane

c)

Pulley

6.
a)

Wedge

b)

Lever

c)

Pulley

7.
a)

Wedge

b)

Screw

c)

Lever

8.

Complex machines have...

a)

a few parts

b)

lots of parts

9.
What is energy?
a)
Energy doesn't exist
b)
It is the capacity to burn coal
c)
It is the ability to do work or to produce transformations
d)
It is a property of the matter used to meassure forces
10.
The ability to move something or cause a change in matter is .....
a)
energy
b)
opaque
c)
heat
d)
light
11.
Mainly, How many types of energy are there?
a)
A lot of
b)
Kinetic and potential energy
c)
Electric and gravitational energy
d)
Elastic and kinetic energy
12.

What is the potential energy?

a)

It is a powerful energy

b)

It is the energy that objects in motion have.

c)

Is the energy objects have due its position or shape

d)

It is the addition of mechanical and kinetic energy

13.

What is the kinetic energy?

a)

It is a powerful energy

b)

Is the energy that objects in motion have.

c)

It is the energy that objects have due its position or shape.

d)

It is the addition of mechanical and potential energy.

14.
Sailing ships obtain  their energy from ........
a)
Gasoline
b)
Sun
c)
Wind
d)
Sea
15.
Animals obtain their energy from ....... 
a)
Food
b)
Sun
c)
Air
d)
Uranium
16.
Calculate the energy of a 2 Kg stone that is located 2 m above the floor.
a)
40 J
b)
400 J
c)
4 J
d)
27 cal
17.
Calculate the energy of a 0,5 Kg rabbit running at 15 m/s.
a)
66,25 J
b)
67,34 J
c)
56,25 J
d)
5,625 J
18.
 Work done = Force x .........?
a)
Distance
b)
Acceleration
c)
Velocity
d)
Speed
19.

Work done on a body by a horizontal force of 40 N for 50 m.

a)

2000 J

b)

200 J

c)

20000J

d)

2 J

20.

When more work is done to raise a barrel of gasoline to a truck, raising it directly or rolling the barrel down a ramp?

a)

Raising it directly

b)

Raising it up the ramp

c)

The same job is done when rolling the barrel down the ramp and raising it directly.

21.
A man carries a load of 500 Kg to a distance of 100 m. The work done by him is? Think about it carefully.
a)
a. 5 J
b)
b. 50,000 J
c)
c. 0
d)
d. 1/5 J
22.
When heat is added to matter, the particles in the matter _____.
a)
move faster
b)
move at the same speed
c)
move more slowly
d)
stop moving
23.
A good conductor of heat energy is ______.
a)
Wood
b)
Plastic
c)
Metal
d)
Rubber
24.
An instrument used to measure __________ is a thermometer.
a)
Evaporate
b)
Condense
c)
Freeze
d)
Temperature
25.

Define Energy:

a)

Something that we can see.

b)

The ability to cause change or do work.

c)

Something that we can eat.

d)

Electricity that makes machines work.

26.

Identify the type of energy

a)

Thermal energy

b)

Sound energy

c)

Mechanical energy

d)

Electrical energy

27.

Identify the type of energy

a)

Sound energy

b)

Thermal energy

c)

Mechanical energy

d)

Electrical energy

28.

Identify the type of energy

a)

Thermal energy

b)

Mechanical energy

c)

Sound energy

d)

Electrical energy

29.

What are compound machines?

a)

Consist of one simple machines like a wheel

b)

Consist of two or more simple objects

c)

Consist of two or more compound machines

d)

Consist of two or more simple machines

30.

What is a pulley?

a)

It is a square and axle with a rope or a chain around it.

b)

It is a wheel and axle with a rope or a chain around it.

c)

It is a wheel, rigid bar and axle with a rope around it.

31.

What is a lever?

a)

It is a flexible bar that rests on a fixed point.

b)

It is a rigid circle that rests on a fixed point.

c)

It is a rigid bar that rests on a fixed point.

32.

A screw is...

a)

An object that cuts through things.

b)

An inclined plane wrapped around a cylinder.

c)

A plane wrapped around a cylinder.

d)

An inclined plane around a cylinder.

33.

We can classify the lever in...

a)

Group 1, 2 and 3

b)

One, two and three class

c)

First, second and third class

d)

Team 1, 2 and 3

34.
THERE ARE THREE TYPES OF PULLEYS:
a)
SIMPLE, MIXED AND COMPOUND
b)
SIMPLE, DOUBLE AND FIXED
c)
FIXED, MOVABLE AND COMPOUND
d)
SIMPLE, MOVABLE AND COMPOUND
35.

The principle of energy conservation states:

a)

Energy can be created but not destroyed

b)

Energy cannot be created, nor destroyed.

c)

Energy can be destroyed but not created

36.

What is work?

a)

When the object moves in a different direction in which the force is exerted

b)

Is the rate at which work is done

c)

Is the ability to do work or cause a change

d)

When the object moves in the same direction in which the force is exerted.

37.

What happens with the work if the force applied is not in the same direction of the motion?

a)

All the work is done.

b)

Part of the work is done.

c)

No work is done.

38.

How do we calculate work?

a)

 W =F⋅dW\ =F\cdot d  

b)

 W = F⋅mW\ =\ F\cdot m  

c)

 W=m⋅g⋅hW=m\cdot g\cdot h  

d)

 W=m⋅v22W=\frac{m\cdot v^2}{2}  

39.

Which are the units of work?

a)

Newtons

b)

Watts

c)

Joules

d)

kg⋅m2s2kg\cdot\frac{m^2}{s^2}

40.

How much work a climber do on his pack if his pack weighs 200N and he climbs to a height of 50m?

a)

100 J

b)

250 J

c)

1000 J

d)

10,000 J

41.

Which are the two factors that determine how much work is done?

a)

Force and speed

b)

Force and distance

c)

Mass and distance

d)

Mass and speed

42.

What is power?

a)

The ability to do work or cause a change

b)

When the force applied is in the same direction as the motion

c)

The amount of energy an object has

d)

The rate at which work is done

43.

How do we calculate power?

a)

P=F⋅dP=F\cdot d

b)

P=WtP=\frac{W}{t}

c)

P=WdP=\frac{W}{d}

d)

P=tWP=\frac{t}{W}

44.

What does a machine do?

a)

To do work the same way

b)

To do work more complex

c)

To do work in an easier way

45.

What is input force?

a)

The force you exert on the machine.

b)

The number of times a machine increases a force exerted on it.

c)

Compares output work to input work.

d)

The force the machine exerts.

46.

What is output force?

a)

The force you exert on the machine.

b)

The number of times a machine increases a force exerted on it.

c)

Compares output work to input work.

d)

The force the machine exerts.

47.

What is efficiency?

a)

The force you exert on the machine.

b)

The number of times a machine increases a force exerted on it.

c)

Compares output work to input work.

d)

The force the machine exerts.

48.

What is mechanical advantage?

a)

The force you exert on the machine.

b)

The number of times a machine increases a force exerted on it.

c)

Compares output work to input work.

d)

The force the machine exerts.

49.

Real machines have an efficiency of less than 100% because some work is wasted to overcome...

a)

Gravity

b)

Work

c)

Friction

d)

Energy

50.

What is an inclined plane?

a)

A device that is thick at one end and tapers to a thin edge at the other hand.

b)

An inclined plane wrapped around a cylinder.

c)

Is made of a grooved wheel with a rope or cable wrapped around it.

d)

Is a flat sloped surface.

51.

What is gravitational potential energy?

a)

The energy objects in motion have.

b)

The energy objects have due to its position or shape.

c)

The energy objects have due to their shape.

d)

The energy objects have due to its position.

52.

What is elastic potential energy?

a)

The energy objects have due to their shape.

b)

The energy objects have due to its position or shape.

c)

The energy objects in motion have.

d)

The energy objects have due to its position.

53.

Which type of lever is the one shown in the image?

a)

First class lever

b)

Second class lever

c)

Third class lever

54.

What kind of lever is the one shown in the image?

a)

First class lever

b)

Second class lever

c)

Third class lever

55.

What kind of lever is the one shown in the image?

a)

First class lever

b)

Second class lever

c)

Third class lever

56.

How can we calculate potential energy?

a)

PE=F⋅dPE=F\cdot d

b)

PE=m⋅g⋅hPE=m\cdot g\cdot h

c)

PE=m⋅v22PE=\frac{m\cdot v^2}{2}

d)

PE=WtPE=\frac{W}{t}

57.

How can we calculate the kinetic energy?

a)

KE=F⋅dKE=F\cdot d

b)

KE=m⋅g⋅hKE=m\cdot g\cdot h

c)

KE=m⋅v22KE=\frac{m\cdot v^2}{2}

d)

KE=WtKE=\frac{W}{t}

58.

What are the two factors that effect the kinetic energy?

a)

Mass and distance

b)

Mass and speed

c)

Mass and height

d)

Mass and gravity

59.

A wedge is...

a)

A device that is thick at one end and tapers to a thin edge at the other hand.

b)

An inclined plane wrapped around a cylinder.

c)

Is made of a grooved wheel with a rope or cable wrapped around it.

d)

Is a flat sloped surface.

60.

Which are the five types of energy we have inside our body?

a)

Electromagnetic, Kinetic, Thermal, Mechanical and Electrical

b)

Electrical, Thermal, Nuclear, Potential and Chemical

c)

Thermal, Nuclear, Mechanical, Electrical and Chemical

d)

Nuclear, Thermal, Mechanical, Chemical and Electromagnetic

61.

What is a fulcrum?

a)

Is the point in which a Screw rotates.

b)

Is the point in which a Wedge.

c)

Is the point in which a lever rotates.

d)

Is the point in which a pulley rotates.

62.

Which is the mechanical advantage of this pulley system?

a)

1

b)

2

c)

3

d)

4

63.

If the mechanical advantages of a peeler are 5, 3, and 10, what is the overall mechanical advantage of the peeler?

a)

18

b)

180

c)

150

d)

15

64.

One way a machine can make work easier is by...

a)

Increasing the force

b)

Decreasing time

c)

Increasing work

d)

reducing work

65.

Which of these is an example of a wheel and axle?

a)

Axe

b)

Seesaw

c)

Doorknob

d)

Flagpole rigging

66.

Which are the three factors you can change by using a machine?

a)

Force, time and distance

b)

Force, direction and distance

c)

Distance, time and direction

d)

Force, direction and time

67.

Mechanical energy is the energy associated with...

a)

The motion, position or shape of an object.

b)

The motion, form or shape of an object.

c)

The motion, position or energy of an object.

d)

The energy, position or shape of an object.

68.

Nuclear energy is the energy...

a)

That is the total kinetic and potential energy of the particles in an object.

b)

Of electric charges.

c)

That travels through space in form of waves

d)

Stored in the nucleus of an atom

69.

Thermal Energy is the energy...

a)

That is the total kinetic and potential energy of the particles in an object

b)

Of electric charges

c)

That travels through space in form of waves

d)

Is potential energy stored in chemical bonds

70.

Electrical Energy is the energy...

a)

That is the total kinetic and potential energy of the particles in an object

b)

Of electric charges

c)

Is potential energy stored in chemical bonds

d)

Stored in the nucleus of an atom

71.

Electromagnetic Energy is the energy...

a)

That is the total kinetic and potential energy of the particles in an object

b)

That travels through space in form of waves

c)

Stored in the nucleus of an atom

d)

Is potential energy stored in chemical bonds

72.

Chemical energy is the energy...

a)

Is potential energy stored in chemical bonds

b)

That travels through space in form of waves

c)

That is the total kinetic and potential energy of the particles in an object

d)

Stored in the nucleus of an atom

73.

A change from one energy to another is called...

a)

Energy change

b)

Energy conservation

c)

Energy transformation

74.

The Sun produces ______ and ______ energy

a)

thermal, light

b)

chemical, sound

c)

kinetic, light

75.
At which position would potential energy be greatest?
a)
W
b)
X
c)
Y
d)
Z
76.
Which would be greater at Position 2?
a)
Potential Energy
b)
Kinetic Energy
77.
Which would be greater at Position 1?
a)
Potential Energy
b)
Kinetic Energy
78.
At which position would kinetic energy be greatest?
a)
W
b)
X
c)
Y
d)
Z
79.

Identify the type of energy

a)

Sound energy

b)

Thermal energy

c)

Mechanical energy

d)

Electrical energy

80.

Identify the type of energy

a)

Electrical energy

b)

Thermal energy

c)

Sound energy

d)

Mechanical energy

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