WorksheetsUnit 1 review grade 8
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
What happens when two forces act in the same direction?
a)
They cancel each other out.
b)
The stronger one prevails
c)
Their strengths are added.
d)
Their sum divided by two is the total force.
2.
The greater the mass of an object......
a)
the easier the object starts moving.
b)
the greater its inertia.
c)
the more balanced it is
d)
the more space it takes up.
3.
The force of gravity on a person or object on the surface of a planet is called
a)
mass.
b)
weight.
c)
velocity.
d)
free fall.
4.
The force that one surface exerts on another when the two rub against each other is called
a)
friction
b)
inertia
c)
acceleration
d)
gravity
5.
The law of universal gravitation states that any two objects in the universe that have mass......
a)
attract each other
b)
repel each other
c)
combine to provide a balanced force
d)
create friction.
6.
Forces can be added together only if they ....
a)
acting on the same object in the same direction
b)
unaffected by gravity.
c)
balanced forces
d)
acting on the same object in opposite directions
7.
According to the law of conservation of momentum, when two objects collide
a)
velocity decreases
b)
velocity increases
c)
they have the same overall momentum before and after.
d)
they have the more overall momentum before and after.
8.
According to Newton’s third law of motion, when a hammer strikes, the nail
a)
creates a friction with the hammer.
b)
disappears into the wood.
c)
exerts an equal and opposite force on the hammer.
d)
moves at a constant speed.
9.
The overall force on an object after all the forces are added together is called the ____force.
a)
unbalanced force
b)
momentum
c)
net force
d)
acceleration
10.
The earths gravitational pull is stronger then that of a car because the earth has more......
a)
velocity
b)
mass
c)
momentum
d)
speed
11.
Newton’s third law says the strength of a reaction force is ___the strength of the action force .
a)
greater then
b)
less then
c)
twice
d)
equal to
12.
The property of matter that resists a change in motion is called inertia.
a)
true
b)
false
13.
Newton’s second law says, weight depends on an object’s mass & the force acting on the object.
a)
true
b)
false
14.
Mass and air resistance affect the gravitational attraction between objects.
a)
True
b)
false
15.
What is the unit for acceleration?
a)
m/s
b)
kg.m/s
c)
m/s squared
d)
N
16.
What is the unit to used to measure force?
a)
m/s
b)
m/s Squared
c)
N
d)
kg.m/s
17.
What unit is used to measure momentum?
a)
m/s
b)
m/s squared
c)
kg.m/s
d)
N
18.
The equation for momentum is.............
a)
mass x velocity
b)
mass x weight
c)
mass x acceleration
d)
acceleration x velocity
19.
What is the acceleration of gravity?
a)
0.6
b)
7.8
c)
3
d)
9.8
20.
A book rests on top of a car as the car starts to move , the book slides backward off the car.
a)
Example of law of conservation of momentum.
b)
Example of newtons 3rd law
c)
Example of newtons 2nd law
d)
Example of newtons 1st law
21.
What is Newtons 2nd law equation?
a)
Mass= force X acceleration
b)
Acceleration= Force X mass
c)
force= mass X acceleration
d)
velocity= mass X acceleration
22.
What is the overall net force?
a)
11 N to the right
b)
11 N to the left
c)
6 N to the left
d)
6 N to the right
23.
In a free body diagram the size of the arrows represents the....
a)
strength of the force
b)
velocity of the objects
c)
acceleration of an object
d)
mass of an object
24.
Unbalanced forces result in motion of objects
a)
True
b)
False
25.
Why do we feel the gravitational pull of the earth but not that of the sun
a)
because the sun is bigger then the earth
b)
because the earth is bigger then the sun
c)
because we are closer to the earth
d)
because we are closer to the sun
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