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Energy / Power / Work

Total questions: 40

Worksheet time: 36mins

Name
Class
Date
1.
Work is the product of?
a)
Speed and force
b)
Force and distance
c)
Power and force
d)
Motion and force
2.

Which requirements are necessary in order for a force to do work on an object?

a)

The Speed and force must be equal

b)

The force and distance must act in opposite directions

c)

Some of the force must act in the same direction as the object moves

d)

Power must equal work x time

3.

Which of the following is the SI unit of work?

a)

joule

b)

watt

c)

horsepower

d)

newton

4.

Generally speaking, how much work is done when a vertical force acts on an opposite and equal force?

a)

A high amount of work

b)

A moderate amount of work

c)

A low amount of work

d)

zero work

5.
Power is equal to work divided by
a)
time
b)
force
c)
distance
d)
mechanical advantage
6.

1 Joule is equal to

a)

1J/s

b)

1Nm

c)

m3

d)

kg

7.
How is the work output of a machine related to its work input?
a)
always less
b)
always greater
c)
always equal
d)
always zero
8.
Why is the actual mechanical advantage of a machine always less than its ideal mechanical advantage?
a)
The presence of friction results in the actual mechanical advantage of a machine always being more than its ideal mechanical advantage.
b)
The presence of friction results in the actual mechanical advantage of a machine always being less than its ideal mechanical advantage.
9.
No machine can be 100% efficient because of
a)
thermal energy
b)
waste energy
c)
convection energy
d)
friction
10.
Which is not considered a simple machine?
a)
the pump
b)
the wheel & axle
c)
the wedge
d)
the screw
11.
What are the primary elements of a lever?
a)
fulcrum, input arm, export arm
b)
fulcrum, lever, effort
c)
fulcrum, input arm, output arm
d)
point, effort arm, load arm
12.
Which is not a type of pulley?
a)
fixed pulley
b)
inclined pulley 
c)
movable pulley
d)
pulley system
13.
A screw can be considered a type of
a)
lever
b)
inclined plane
c)
pulley
d)
compound machine
14.
Which of the following is NOT an example of a simple machine (when used for it’s primary purpose)?
a)
axe handle
b)
crow bar
c)
wheel & axle (screw driver)
d)
a screw
15.
Which is not a simple machine?
a)
wedge
b)
screw
c)
lever
d)
fulcrum
16.

Work is a _______quantity.

a)

Vector

b)

Scalar

17.
The basic unit of measurement for Energy is
a)
Newton
b)
joule
c)
watts
d)
calorie
18.
Which of the following is not one of the forms of Energy?
a)
Mechanical
b)
Thermal
c)
Electromagnetic
d)
Electronegativity
19.
The energy of a moving object is
a)
kinetic energy
b)
potential energy
c)
chemical energy
d)
nuclear energy
20.

The SI unit for Power is

a)

Newtons

b)

Joules

c)

Watts

d)

J/s

21.
An example of electromagnetic energy is
a)
a falling rock
b)
a stretched spring
c)
a speeding train
d)
sunlight
22.
Energy stored in the bonds between atoms is called
a)
kinetic energy
b)
potential energy
c)
chemical energy
d)
nuclear energy
23.
Mechanical energy is
a)
found in machinery only
b)
usually measured at the atomic level
c)
the sum of the chemical and thermal energy of an object
d)
the sum of the kinetic and potential energy of an object
24.
An example of the conversion of gravitational potential energy into kinetic energy is
a)
a falling raindrop
b)
a gasoline-powered engine
c)
striking a match
d)
a hockey puck sliding on ice
25.
The law of conservation of energy states that
a)
energy cannot be converted from one form to another
b)
energy cannot be created or destroyed
c)
energy resources must be used efficiently
d)
energy is constantly being lost to friction
26.
Which light form of energy does a plant store when light is transformed during photosynthesis?
a)
chemical energy
b)
thermal energy
c)
mechanical energy
d)
electrical energy
27.

Which of the following is NOT a method by which machines make work easier?

a)

Changes power

b)

Increases force

c)

Increases distance

d)

Changing direction

28.
Potential energy is
a)
mass x height x force
b)
mass x height x time
c)
mass x height x acceleration due to gravity
d)
height x mass x velocity
29.

A rigid bar that is free to move around a fixed object

a)

Pulley

b)

Wheel & axle

c)

Inclined plane

d)

Lever

30.
True or false:
Is there a such thing as "cold"?
a)
true: "cold" does exist
b)
false: there is no such thing as "cold"
31.
______ is the amount of energy needed to raise the temp of 1g of a material by 1oC
a)
Convection
b)
Conduction
c)
Specific Heat
d)
Radiation
32.
______ is the transfer of energy through matter by direct contact of particles
a)
Convection
b)
Conduction
c)
Specific Heat
d)
Radiation
33.
______ is the transfer of energy by the movement of matter
a)
Convection
b)
Conduction
c)
Specific Heat
d)
Radiation
34.
______ is the transfer of energy in form of waves
a)
Convection
b)
Conduction
c)
Specific Heat
d)
Radiation
35.

Three types of this type of simple machines exist - fixed, moveable, a system.

a)

Pulley

b)

Wheel & axle

c)

Inclined plane

d)

Lever

36.

A screwdriver falls into this category

a)

Pulley

b)

Wheel & axle

c)

Inclined plane

d)

Lever

37.
A flat sloping surface that connects lower and higher elevations. It makes raising objects easier.  
a)
wedge
b)
screw
c)
lever
d)
inclined plane 
38.
An inclined plane wrapped around a rod forms this simple machine 
a)
lever
b)
pulley
c)
screw
d)
wedge 
39.
An axe is an example of a
a)
pulley
b)
inclined plane
c)
screw
d)
wedge 
40.
A device that has two or more simple machines working together 
a)
fulcrum 
b)
pulley
c)
compound (complex) machine 
d)
motor 

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