Unit 4: Physics II Exam Review
Learning Goal 1 – Important Forces
(6.8A)
1) Circle which definition for force is best?
“A push or a pull.”
“Something that causes motion.”
“Force is the same thing as motion.”
2) Friction is a force that resists motion between
two objects.
3) Gravity is a force that comes from the center of the Earth and it is a (push /
pull).
4) True/False:
T. Objects of the same shape, but different mass,
fall at the same rate.
F. Friction can cause objects to speed up.
F. Gravity comes from the atmosphere.
T. The sun has more gravity than the earth.
Learning Goal 2: Balanced and Unbalanced
Forces (6.8B)
5) Write “balanced” or “unbalanced by each of the
diagrams.
unbalanced.
balanced.
6) A rocket pushes up with a force of 5, 5567 newtons
while gravity pulls down with a force of 3,100 newtons. Draw a diagram and find
the net force on the rocket.
Diagram: Solve: 2467 N
7) What is the net force in the diagram to the left?
50 N
8) In the diagram to the left, which way will motion
occur? Left
10) Circle does the diagram below represent a balanced or unbalanced force?
11) Which way will the piano move? Left
Learning Goal 3: Speed (6.8C)
11) What is the formula for
speed? S = d / t
12) Argelio walked to school
in 30 minutes. His school is 60 kilometers away. What was his average speed?
2 km per minute
13) What is the average speed
of a plane that flies 1,500 miles in 10 hours?
150 mph
Learning Goal 4: Graphs of Motion (6.8D)
14) How far had the battery rolled
after 4 seconds?
~ 50 meters
15) What was the average speed
of the battery?
20 mps
Learning Goal 5: Force and Acceleration
(6.8D)
22) What is the difference between the formula for speed
and the formula for acceleration?
Speed = d/t
Acceleration = f/m or (vf  vi) / t
23) Give three examples of acceleration, using all three
things that a physicist considers acceleration.
· moving
· changing speed
· turning
24) Which is not
an example of acceleration?
a)
A falling object increasing speed as it falls
b)
Running a lap in a circle around the PE fence
c)
Changing velocity from 5 m/s to 3 m/s
d)
Running forward at a rate of 8 miles per hour
A Lamborghini goes from 10 m/s to 26 m/s
in 2 seconds.
Formula: Acceleration = (vfvi)/t
Solve:
8 mps^2
26) A mover is putting 96 newtons of force on a box. The
box weighs 8 kilograms. At what rate will it accelerate?
Known:
f=96
m = 8

Formula:
a=f/m

Unknown:
acceleration

Solve:
12 mps^2

>
Formulas: f = m x a; a = f ÷ m
27) According to Newton’s Second Law, you make a car more
difficult to accelerate if:
a)
You give it a more powerful engine
b)
You construct it out of a less heavy material
c)
You put more people in it
Learning Goal 6: Newton’s Laws in Action
28) Draw a diagram
showing force pairs and write an action and reaction for the following
scenarios.
Example: Rocket blasts off. Diagram:
Action: Rocket pushes up through the air.
Reaction: Gravity pulls down.
Circle the law that the scenario is showing in action. On
the test, you will have to explain, too. J
A person not wearing their seatbelt flies out of the
front window of a car when it hits a telephone pole.
Law: 1^{st} 2^{nd} 3^{rd}
A ball bounces up when it pushes down on the ground.
Law: 1^{st} 2^{nd} 3^{rd}
A swimmer swims by pushing backwards on the water.
Law: 1^{st} 2^{nd} 3^{rd}
A big truck also needs a bigger engine in order for it to
accelerate quickly.
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