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Worksheets8th Grade Science Q4 Review
Total questions: 40
Worksheet time: 30mins
Name
Class
Date
1.
Many factors affect the force of gravity on an elephant. Which of the following will have the LEAST effect on force of gravity between the earth and an elephant?
a)
A) The elephant eats 20 kilograms of bananas and palm leaves.
b)
B) The elephant climbs to the top of a tall Himalayan mountain.
c)
C) The elephant walks to a new location across the flat savanna.
d)
D) The elephant gets sick and is unable to eat for several days.
2.
An asteroid is equal distance between the Moon and the Earth. How will the Moon and Earth affect the asteroid’s movement?
a)
a. The gravitational pull of the Moon on the asteroid will be larger compared to Earth’s.
b)
b. There would not be any gravitational force acting on the asteroid since it is in space.
c)
c. The gravitational pull of the Earth on the asteroid will be larger compared to the Moon’s.
d)
d. The asteroid will not move since the gravitational pull of Earth and Moon cancel each other.
3.
The force of gravity on an object is called what?
a)
weight
b)
mass
c)
pressure
d)
ping
4.
What two main factors keep a planet in motion?
a)
mass and size
b)
weight and mass
c)
force and motion
d)
gravity and inertia
5.
Force of gravity is directly proportional to
a)
Mass
b)
Weight
c)
Distance
d)
Time
6.
Force of gravity is inversely proportional to
a)
Mass
b)
Weight
c)
Distance
d)
Time
7.
As distance between two objects increase, the pull of gravity
a)
Increases
b)
Decreases
c)
Stays the same
8.
Two factors effecting the magnitude of the force of gravity between 2 objects are...
a)
mass and distance
b)
mass and matter
c)
distance and weight
d)
weight and mass
9.
Which of the following will change with different gravitational forces?
a)
mass
b)
amount of matter in an object
c)
weight
d)
kilograms
10.
Which of the following will not change in different gravitational fields?
a)
weight
b)
force
c)
mass
d)
pounds
11.
What is the unit of measurement for weight
a)
Grams (g)
b)
Newtons (N)
c)
Pounds (lbs)
d)
Kilograms (Kg)
12.
Complete the following statement: The farther away two planets are the _______ the gravitational force between them.
a)
greater
b)
same
c)
zero
d)
less
13.
What states that "every object in the universe attracts every other object"?
a)
Law of Universal Gravitation
b)
Newton's First Law of Motion
c)
My mother
d)
Inertia & gravity
14.
Why do all of the planets orbit the sun rather than Earth?
a)
the sun has more mass
b)
the sun is a star
c)
the Earth is heavier
d)
the sun is in the middle of the milky way
15.
What does this tool measure?
a)
weight
b)
meters
c)
mass
d)
force
16.
What does this tool measure?
a)
weight
b)
meters
c)
mass
d)
force
17.
If Earth's mass was cut in half, what would happen to your weight?
a)
Increase because gravitational force increases
b)
decrease because gravitational force decreases
c)
decrease because gravitational force increases
d)
nothing, weight is not affected by gravitational force
18.
What keeps the planets from flying into space?
a)
Gravity of the Sun
b)
Gravity of the Earth
c)
Weight of the Sun
d)
Weight of the Earth
19.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left
d)
Both magnets will turn to the right
20.
Magnets have a north and a south ___________
a)
shape
b)
color
c)
pole
d)
region
21.
Iron, Nickel and cobalt are all __________________ materials
a)
Shiny
b)
poles
c)
magnetic
d)
cold
22.
Where is the strongest attraction force of the magnet?
a)
at the poles
b)
in the middle
c)
above the magnet
d)
below the magnet
23.
Which object would a magnet attract?
a)
a glass bottle
b)
a piece of paper
c)
a metal paper clip
compass
compass
d)
a rubber eraser
magnetic field
magnetic field
24.
What happens when two north poles of a magnet are placed together?
a)
they repel
b)
they attract
c)
they cancel each other out
d)
the strength of the magnet is doubled
25.
Which of the following is true about a bar magnet?
a)
Its magnetic field is strongest near its center.
b)
It is surrounded by a magnetic field.
c)
The north pole is stronger than the south pole.
d)
The south pole is stronger than the north pole.
26.
The space around a magnet where the force of a magnet can attract best is called__________
a)
magnetism
b)
bar magnet
c)
horseshoe magnet
d)
magnetic field
27.
What would we call a nail that can pick up a paperclip because it is touching a magnet?
a)
temporary magnet
b)
poles
c)
force
d)
detector
28.
The force of magnetism is stronger when magnets are ________________
a)
cold
b)
round
c)
closer together
d)
farther apart
29.
Where is Earth's magnetic field strongest?
a)
Along the outside lines
b)
Along the inside lines on either side
c)
Where the lines are close together at the poles
d)
In the space outside of the lines
30.
A coil that is magnetized only when an electric current flows through it is_______.
a)
a battery
b)
a generator
c)
a conductor
d)
an electromagnet
31.
A simple electromagnet can be made with which of the following?
a)
an electric current
b)
a turbine and nail
c)
a nail, a wire, and a battery
d)
a compass and a battery
32.
How can the strength of an electromagnet be increased?
a)
by rubbing it with a stronger magnet
b)
by increasing the coils of wire around the iron
c)
by increasing the length of the wire from the battery
d)
by loosening the coil of wire around the iron
33.
This is called an __________________.
a)
bomb
b)
circuit
c)
electromagnet
d)
coil
34.
You can make an electromagnet stronger by: having a __________________ current in the wire
a)
smaller
b)
larger
c)
greener
d)
water
35.
Electric motors are devices that convert _____ energy into _____ energy.
a)
electrical; mechanical
b)
mechanical; electrical
c)
chemical; potential
d)
mechanical; kinetic
36.
You can make an electromagnet stronger by: using __________________ coils of wire
a)
bigger
b)
smaller
c)
more
d)
less
37.
A technology company has identified the need for a smaller laptop computer that weighs less, but they do not have enough knowledge about how to build it.
What would be the next logical step engineers would take to design and produce this laptop computer?
What would be the next logical step engineers would take to design and produce this laptop computer?
a)
Build a new type of laptop battery
b)
Research current laptop technology
c)
Build a prototype computer
38.
A group of engineers designed and constructed a flying car prototype. Their goal is for the car to enable people to safely fly to and from work instead of getting stuck in traffic jams.
How will the engineers determine that this prototype meets their design requirements?
How will the engineers determine that this prototype meets their design requirements?
a)
Have a test pilot attempt to fly it from one location to another.
b)
See if the car can hover one meter above the ground for 20 minutes.
c)
Drive in the car at highway speeds on an interstate roadway at nighttime.
39.
Technicians plan to develop a new type of keyboard that will have alphabet letters in different positions from a standard keyboard. Which will best help the technicians decide if the new keyboard is an improvement over the standard one?
a)
analyzing the problems that people have using standard keyboards
b)
asking people their opinions of how they like standard keyboards
c)
comparing the speeds at which people type on each style of keyboard
40.
A factory produced a new type of refrigerator designed to use less electricity. The machine was manufactured and sold to the public at Target, Wal-Mart, and K-Mart. After several months, reports showed that this refrigerator was not working correctly.
Which choice below is the most likely cause?
Which choice below is the most likely cause?
a)
The proper cost analysis was not performed.
b)
The designers did not test other types of machines.
c)
They did not rigorously test and modify the prototype
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