Worksheets8th Grade Forces & Motion
Total questions: 54
Worksheet time: 1hrs 20mins
Name
Class
Date
1.
What is speed?
a)
how far you go
b)
how much distance is covered over a period of time
c)
how fast you accelerate
d)
the change in the location of a object
2.
What is the formula to calculate speed?
a)
Speed = time/distance
b)
Speed = distance/time
c)
Speed = distance x time
d)
Speed = time x distance
3.
A Drake races in the 100 meter dash. It takes him 10 seconds to finish. What is his average speed?
a)
10 m/s
b)
1000 m/s
c)
100 seconds
d)
10 seconds
4.
Which of the following is a unit for acceleration?
a)
km/s
b)
m/s2
c)
mi/hr
d)
ft
5.
What is velocity?
a)
the quickness of an object
b)
the location of an object
c)
acceleration
d)
speed in a specific direction
6.
Calculate the average speed (in meter/sec) if a cheetah runs 180 meters in 10 seconds.
a)
198 m/sec
b)
170 m/sec
c)
12 m/sec
d)
18 m/sec
7.
When a car goes around a corner at 20 mph, why do we say it accelerates?
a)
The car is accelerating because of the velocity is constant
b)
The car accelerates because it's going 20 mph
c)
Cars always accelerate when they are in motion
d)
The car is accelerating because it's changing direction
8.
A roller coasters accelerates from an initial velocity of 6.0 m/s to a final velocity of 70 m/s over 4 seconds. What's the acceleration?
a)
24 m/s2
b)
18 m/s2
c)
16 m/s2
d)
16 m/s
9.
A drag racer accelerated from 0 m/s to 200 m/s in 5 s. What was the acceleration?
a)
0 m/s
b)
40 m/s2
c)
-40 m/s2
d)
40 m/s
10.
A dog runs with an initial speed of 7.5 m/s on a waxed floor. It slides to a stop in 15 seconds. What is the acceleration?
a)
-7.5 m/s
b)
-7.5 m/s2
c)
-0.5 m/s2
d)
7.5 mi//hr
11.
Acceleration can be classified as _______________
a)
Speeding up
b)
Slowing Down
c)
Changing directions
d)
All of the above
12.
Total distance divided by total time is
a)
average speed
b)
constant speed
c)
instantaneous speed
d)
acceleration
13.
What does this graph represent?
a)
Constant Speed
b)
Acceleration
c)
Not moving
14.
What does the strength of gravity between two objects depend upon?
a)
Mass & distance
b)
Mass & weight
c)
Gravity & inertia
d)
Inertia & mass
15.
All objects in the universe have a gravitational attraction to each other.
a)
True
b)
False
16.
An _______ force must act on an object for it to CHANGE it's motion
a)
balanced
b)
unbalanced
c)
gravitational
d)
electrical
17.
Jupiter has about 317 times more mass than Earth. What can you infer from this fact?
a)
That Jupiter’s gravitational force is much weaker than on Earth’s gravitational force.
b)
That Jupiter’s gravitational force is much stronger than Earth’s gravitational force.
c)
That Jupiter’s and Earth’s gravitational forces are equal.
d)
Mass has no effect on the gravitational force between two objects
18.
What is defined as a push or pull?
a)
force
b)
motion
c)
vector
d)
speed
19.
This type of force is when one object pushes or pulls on another object by touching it
a)
contact
b)
gravity
c)
friciton
20.
This type of force resist motion between two surfaces that are pressed together
a)
contact
b)
gravity
c)
friction
21.
If the net force is equal to zero, the forces acting on the object are
a)
balanced
b)
unbalanced
22.
The unit of force is
a)
m/s
b)
m/s^2
c)
newton
d)
kg
23.
How could you make an object increase its speed?
a)
use less force
b)
use more force
c)
use no force
24.
for every action there is...
a)
An equal and opposite reaction
b)
An equal and different reaction
c)
a different force
d)
two more forces
25.
What is it called when the force of gravity is acting on an object?
a)
Weight
b)
Sliding Friction
c)
Momentum
d)
Projectile Motion
26.
Inertia is the tendency of an object to resist a change in its ___________.
a)
temperature
b)
shape
c)
size
d)
motion
27.
Which is Newtons second law
a)
Force is equal to an objects mass times its velocity
b)
an object in motion stays in motion or an object at rest stays at rest unless acted on by an outside force.
c)
law of inertia
d)
For every action there is an equal and opposite reaction
28.
If you slide a hockey puck on ice, eventually it will stop because of the friction of the ice. This is an example of which Law of Motion.
a)
Newton's First Law
b)
Newton's Second Law
c)
Newton's Third Law
29.
A person not wearing a seat belt flies through a car window when someone slams on the breaks because the person’s body wants to remain in continuous motion even when the car stops.
a)
Newton's 1st Law
b)
Newton's 2nd Law
c)
Newton's 3rd Law
d)
None of them
30.
According to Newton's Third Law of Motion, when a hammer strikes and exerts a force on a nail, the nail
a)
disappears into the wood
b)
moves at a constant speed
c)
exerts an equal and opposite force back on the hammer
d)
creates a balanced force
31.
Friction is a force that acts in an ___________ direction of movement.
a)
similar
b)
opposite
c)
parallel
d)
west
32.
What type of friction is not moving?
a)
static
b)
sliding
c)
fluid
d)
rolling
33.
How will this object move?
a)
It won't move.
b)
It will move to the right.
c)
It will move to the left.
d)
It will move in both directions.
34.
How will this object move?
a)
It won't move.
b)
It will move to the right.
c)
It will move to the left.
d)
It will move up.
35.
Are forces balanced or unbalanced when a car is moving at a constant speed in a straight line?
a)
Balanced
b)
Unbalanced
36.
Oil between machine parts would be an example of which type of friction?
a)
static
b)
sliding
c)
fluid
d)
rolling
37.
Objects balanced on Timmy's head experiences-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
38.
Which type of friction occurs when an object moves through a liquid or gas?
a)
sliding
b)
fluid
c)
static
d)
rolling
39.
Which type of friction occurs when solid surfaces slide over each other?
a)
rolling
b)
static
c)
sliding
d)
fluid
40.
Which type of friction occurs when an object rolls over or rotates on a surface?
a)
sliding
b)
static
c)
fluid
d)
rolling
41.
The momentum of an object depends upon the object's ___________&_____________.
a)
size and shape
b)
mass and speed
c)
mass and veloctiy
d)
mass and energy
42.
Net force
a)
The sum of all the forces acting on a mass
b)
The standard unit for measuring force in the metric system
c)
A force acting between surfaces in contact.
d)
A push or a pull
43.
A force exerted on an object by another object
a)
Applied force
b)
Work
c)
Power
d)
Gravity
44.
What is the net force on an object with a force of 100 N to the right and 50 N to the left?
a)
100 N right
b)
50 N left
c)
50 N right
d)
150 N right
45.
What type of simple machine has a ramp that makes it easier for a heavy object to be moved up or down?
a)
lever
b)
pulley
c)
inclined plane
d)
wedge
46.
This picture shows an example of what type simple machine?
a)
pulley
b)
wedge
c)
lever
d)
wheel and axle
47.
A seesaw is an example of what type of simple machine?
a)
wheel and axle
b)
lever
c)
wedge
d)
pulley
48.
This is an example of what type of simple machine?
a)
inclined plane
b)
wedge
c)
screw
d)
lever
49.
Which one is NOT a simple machine?
a)
pulley
b)
stick
c)
lever
d)
screw
50.
What type of simple machine makes chopping wood easier?
a)
inclined plane
b)
screw
c)
wedge
d)
lever
51.
A bicycle is an example of a _________________.
a)
simple machine
b)
wheel
c)
pulley
d)
compound machine
52.
What type of simple machine is shown here?
a)
Pulley
b)
Wheel and Axle
c)
Lever
d)
Wedge
53.
A door stop is an example of a
a)
Screw
b)
Wedge
c)
Lever
d)
Inclined Plane
54.
This simple machine has a stiff bar that moves about a fixed point, called a fulcrum.
a)
screw
b)
wheel and axle
c)
wedge
d)
lever
100 %
