Name: _________________________________
Date: __________
Period: __________
Mrs. Bonewald/Ms. Schoepfer
Science 7 Unit 2 Exam Study Guide
DUE DATE: 12/2/15
TEST DATE: 12/3/15
The following topics will be covered on the Unit 2 Exam.
I. Speed/Motion
II. Forces
A. Balanced and Unbalanced
B. Friction
C. Gravity and Air Resistance
III. Newton’s Laws
Part I- Speed/Motion (Use your Aim # 5 notes for reference)
1. Define Motion:
Movement of the car
2. Analyze the picture to the right.
a. Is the boy moving in relation to you? ________________
b.
Is the car moving in relation to you? ________________
c. Are the boy and the car moving in relation to each other? ____________
Directions: Fill out the correct formulas below by using the SDT triangle.
Speed Formula
Distance Formula
S=
Time Formula
T=
D=
Directions: Make sure you show all of your work to receive the full four points for each question.
3. A train travels 380 miles in 6 hours. Calculate the average speed of the train.
Answer: ___________________________________
4. A dog runs 400 meters in 85 seconds. Calculate the dog’s average speed.
Answer: ___________________________________
Part II- Force
A. Balanced vs. Unbalanced (Use your Aim # 6 “Forces” notes)
5. Define Force:
6. Identify three ways force can affect motion.
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7. Describe three facts about force.
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8.
Define net force:
9.
Describe an unbalanced force. Does it cause motion?
10. Describe a balanced force. Does it cause motion?
11. Eric and Steve are playing tug of war. Eric is pulling with 300N and Steve is pulling with 275 N. Who is
winning? Calculate the net force.
12. Calculate the net force for each example. If there is motion include the direction of the motion. Show all
your work and final answers to the left of the picture.
a.
b.
c.
Part II- Force
B. Friction (Use your Aim # 6b “Friction” notes)
13. Describe the difference between static, rolling, and sliding friction.
14. Of the three types of friction, which type has the most frictional force and requires the greatest force to
overcome? (Rolling, Static, or Sliding)
15. Of the three types of friction, which type has the least frictional force and requires the least amount of force
to overcome? (Rolling, Static, or Sliding)
16. How could you reduce friction? Describe two ways.
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
17. What would happen to a rolling ball if we released all friction?
18. Draw two arrows to represent the push or pull force and the friction. Label each.
Part II- Force
C. Gravity and Air Resistance (Use your Aim # 6c “Air Resistance and Gravity”
notes)
19. Define gravity:
20. Define air resistance:
21. With air resistance, why will a bowling ball fall to the ground faster than a piece of paper? Use surface area
and air resistance in your response.
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22. Analyze the picture below. Draw two arrows to represent the forces acting on the parachute. Label both
arrows with the type of force it represents.
23. According to gravitational force, why would a bowling ball fall to the ground faster than a basketball? Use
the word mass and gravitational force in your response.
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24. According to gravitational force, why is there more gravitational pull between Earth and the Moon as
opposed to Earth and the Sun.
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Part III- Newton’s Laws
25. Describe Newton’s First Law:
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26. Define Inertia:
27. Describe how mass and inertia are related.
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28. According to inertia, why does your body move forward when you step on the brake?
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29. Describe Newton’s Second Law:
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30. Calculate how much force must be exerted to push an object that is 70 g at 10m/s2. Show your work.
31. An object accelerates at 7 m/s2 when a 20 N force is applied to it. Calculate the mass of the object. Show
your work.
32. Describe Newton’s Third Law:
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33. How is a rocket being launched an example of Newton’s third law?
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