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Intro Physics
Chapter 2
Study Guide
Use your textbook to define the following terms (You may use the space below or notebook paper):
Section 2.1
1. Natural Motion-
2. Unnatural Motion-
Section 2.2
3. Inertia-
Concept Check
A ball rolling on a pool table slowly comes to a stop. How would Aristotle explain this behavior? How
would Galileo explain it? How would you explain it?
Section 2.3
4. Speed-
5. Velocity-
6. Vector Quantity-
Concept Check
1. What is the average speed of a cheetah that sprints 100 m in 4 seconds? How about if it sprints 50 m
in 2 seconds?
2. The speedometer on a bicycle moving east reads 50 km/h. It passes another bicycle moving west at
50 km/h. Do both bikes have the same speed? Do they have the same velocity/
3. “She moves at a constant speed in a constant direction.” Say the same sentence in fewer words.
Section 2.4
7. When discussing motion, we mean motion _______________ to something else.
Section 2.5
8. Newton’s First Law (Law of Inertia)-
Concept Check
When the space shuttle moves in a nearly circular orbit around the Earth, is a force needed to maintain
its high speed? If suddenly the force of gravity were cut off, what type of path would the shuttle follow?
Section 2.6
9. Net Force-
10. Newton (measurement)-
Section 2.7
11. Equilibrium Rule-
Concept Check
Consider the gymnast hanging from the rings.
1. If she hangs with her weight evenly divided between the two rings, how would scale readings in both
supporting ropes compare with her weight?
2. Suppose she hangs with slightly more of her weight supported by the left ring. How would a scale on
the right read?
Section 2.8
12. Support Force-
Concept Check
1. What is the net force on a bathroom scale when a 110-pound person stands on it?
2. Suppose to stand on two bathroom scales with your weight evenly divided between the two scales.
What will each scale read? How about if you lean with more of you weight on one scale than the
other?
Section 2.9
13. Static Equilibrium-
14. Dynamic Equilibrium-
Concept Check
An airplane flies at constant velocity. In other words, it is in equilibrium. Two horizontal forces act on
the plane. One is the thrust of the propeller that pushes it forward. The other is the force of air resistance that
acts in the opposite direction. Which force is bigger?
Complete Chapter 2 Review (Pages 31-33).