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WorksheetsGrade 8 Systems Review
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
When a machine takes a small input force and increases the magnitude of the output force, WHAT HAS BEEN PRODUCED?
a)
Energy
b)
Mechanical Advantage
c)
The conversion of rotational (turning) motion to linear motion (movement in a straight line).
d)
Work
2.
What is a system?
a)
The fixed point at which a lever pivots.
b)
A group of parts that work together to perform a function.
c)
A push or pull on an object that may result in a change in the object’s motion or shape
d)
Unintended or undesirable outputs
3.
What is not an example of a physical system?
a)
Solar system
b)
Digestive system
c)
Government
d)
Electrical system
4.
Which of these is not a force?
a)
Mechanical Advantage
b)
Friction
c)
Gravity
d)
Buoyancy
5.
What is a side effect of a system?
a)
Exploring how systems affect people, other organisms, and the environment.
b)
All of the tasks or services that the system performs.
c)
The unintended or undesirable outputs of a system
d)
All of the things that go into a system to make it work.
6.
Which of these is not considered an input of a system?
a)
sun
b)
gasoline
c)
energy
d)
flowers
7.
Which of these is not a simple machine?
a)
Wheelbarrow
b)
Screw
c)
Wheel and axle
d)
Pulley
8.
What is the purpose of machines?
a)
To recapture lost energy of prevent energy from escaping in the first place
b)
To reduce the amount of friction between two sliding parts
c)
To measure of how strong force is
d)
To help us use energy more efficiently/ do work easier.
9.
How does an inclined plane help us do work?
a)
Allows us to move heavy objects using a smaller force
b)
Magnifies input force
c)
Can be used to increase the size of the force or the speed
d)
By minimizing any force lost because of friction/slippage.
10.
What two forces are involved when a machine is used to do work?
a)
push & pull
b)
input force & output force
c)
gravity & buoyancy
d)
weight & gravity
11.
What is mechanical advantage?
a)
Basic accuracy training.
b)
A measure of how strong the force of gravity is between two objects.
c)
When a machine reduces the chances of effectiveness.
d)
A measure of how much easier the machine makes the work.
12.
Force is measured in:
a)
Marshmallows
b)
Joules
c)
g/cm3
d)
Newtons
13.
What is not an input for a car?
a)
Applying force on the gas pedal
b)
Movement
c)
Turning the steering wheel
d)
Gasoline
14.
Why would I weigh less on the moon?
a)
Moon has a smaller mass than Earth, so its gravitational pull is less
b)
Your weight stays the same regardless of what planet you are on.
c)
There's no Bulk Barn on the Moon
d)
Because my mass changes depending on gravity.
15.
What's a more accurate measure of mechanical advantage?
a)
Ideal Mechanical Advantage
b)
Actual Mechanical Advantage
c)
IMA - AMA
d)
W = F x d
16.
Effort Force
a)
is the force EXERTED BY a machine
b)
is also known as Resistance Force
c)
is the force APPLIED TO a machine on the input arm
d)
is applied to the resistance/load/ output arm
17.
What is friction?
a)
The force that resists motion between two objects in contact
b)
The mechanical advantage in a “perfect” world
c)
The moment when a specific technological shift hits mainstream society
d)
A substance that helps parts of a system work efficiently
18.
Which of the following is used to decrease friction?
a)
Slip resistant shoes
b)
Rubbing sticks together to make fire
c)
Ski wax
d)
Rough surfaces
19.
What does "escaping" energy mean?
a)
Where energy goes to die
b)
When energy vanishes into nothing
c)
When energy is destroyed
d)
When energy is not used to perform useful work
20.
Automation
a)
Is the use of mechanical and electronic equipment to reduce the need for human labor
b)
Is defined as large changes in organizational structures that takes place in a relatively short period of time
c)
Will not change the job market dramatically
d)
Has only benefits and no disadvantages
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