WorksheetsUnit 4: Physics CFB 8th Grade
Total questions: 30
Worksheet time: 17mins
Balanced Forces are:
constant motion and stationary objects
increased speed
decreased speed
change in direction
Unbalance forces are
constant motion
increased speed and decreased speed only
stationary object
increased speed, decreased speed, change in direction
Acceleration is
any change in velocity
a speed in a direction
balanced forces
displacement
Acceleration is
increased speed
decreased speed
change in direction
all of the above
velocity is
speed
speed in a direction
mass
distance
What is the formula for force?
f= m x a
f= m/a
f= a/m
a= f/m
What is the formula for mass?
m= f x a
m= a/m
m= f/a
a= f/m
What is the formula for acceleration?
a= f x m
a= m/f
m= f/a
a= f/m
What unit of measurement is used for mass?
kg
m/s2
N
any of the them
What unit of measurement is used for force?
kg
m/s2
N
any of the them
What unit of measurement is used for acceleration?
kg
m/s2
N
any of the them
What type of force causes constant motion?
balanced forces
unbalanced forces
both balanced and unbalanced forces
there's no way to know
What type of force causes an object to be stationary (not move)?
balanced forces
unbalanced forces
both balanced and unbalanced forces
there's no way to know
What type of force causes an object to change directions?
balanced forces
unbalanced forces
both balanced and unbalanced forces
there's no way to know
What type of force causes an object to increase or decrease speed?
balanced forces
unbalanced forces
both balanced and unbalanced forces
there's no way to know
Which of these describes the velocity of an object?
5 mph
6 mL
40 m/s
100 mph north
Objects rolling down a ramp...
maintain a constant speed
increase in speed
decrease in speed
remain stationary
If a car makes a right hand turn while going a constant speed of 10 mph, how can the motion be described?
There was a change in velocity since the car kept a constant speed.
There was no change in velocity since the car changed directions.
There was a change in velocity since the car changed directions.
There was no change in velocity since the car kept a constant speed.
If you lean against a wall with a strong force and the wall doesn't fall down, what is happening?
The wall is exerting a force that is equal and opposite to the force you are exerting on it.
The wall is not exerting any force.
The wall is changing velocity.
The wall is accelerating at a higher rate than you are.
How do you find the net force if two forces are acting in opposite directions?
Add the two forces together.
Greater force minus the lesser force.
Multiply the two forces together.
Divide the lesser force by the greater force.
How do you find the net force if two forces are acting in the same direction?
Add the two forces together.
Greater force minus the lesser force.
Multiply the two forces together.
Divide the lesser force by the greater force.
Which of the following is not an example of the law of action-reaction?
gases released from a rocket, propelling the rocket up
wall exerting the same force as an object leaning on it
a ball rolling down a hill
a balloon travelling the opposite direction of the air it's releasing
What is inertia?
mass times acceleration
increased speed, decreased speed or change in direction
terminal velocity
the tendency for objects to remain in their current state of motion
What would cause sudden movement?
mass
balanced forces
unbalanced forces
density
According to the law of action-reaction, what would happen if I jumped off the front of my skateboard?
my skateboard would remain stationary
my skateboard would move backward
my skateboard would move forward
the skateboard would flip over
What is the formula for speed?
d/t
d x t
t/d
s x d
What is the formula for average speed?
distance divided by time
total distance divided by total time
total time divided by total distance
total time x total distance
A car travels 15 km in 15 minutes. What is the speed in km/h?
1 km/h
15 km/h
30 km/h
60 km/h
On a motion graph (distance/time), a horizontal line indicates...
motion in a straight line
no motion
motion away from the starting point
motion toward the starting point
On a motion graph (distance/time), a line sloped downward indicates...
motion in a straight line
no motion
motion away from the starting point
motion toward the starting point
