Name: ___________________________________________ date: _________________
Chapter 2 Study Guide Sections 4-9
1.
What angle will produce the greatest horizontal range? 45°
2.
Force due to the rubbing of materials or surfaces: A) weight B) mass C) friction
3.
The Greek letter used to symbolize the coefficient of sliding is “mu”. T or F
4.
Can a change in material &/or texture affect mu? Yes or No
5.
Does weight significantly affect mu? Friction? Yes or No
6.
Is there a unit of measurement when calculating (mu)? Yes or No
7.
Which would have a HIGHER mu? A. ice or B. concrete
8.
Is “mu” a A) fraction or B) decimal?
9.
As speed increases, friction
A) increases
T or
11. “Stored” energy:
A) kinetic
B) potential
12. “Motion” energy:
A) kinetic
B) potential
C) stays the same
F
13. PE, KE, & Work unit of measure: A) Newton
B) Joule C) Joules per second
14. Force moves an object a distance:
B) work
15. How fast work is done:
A) energy
A) energy
B) work
24. The diagram below shows the sequence of an athlete during the long jump.
Refer to the diagram to answer the questions below:
B) decreases
10. Energy can be defined as the ability to do work.
23. How much work is done to move an object 4 m if 2N of force is applied? (W=Fd)
W=2*4=8J
a)
b)
c)
d)
e)
f)
g)
h)
Circle the types of energy present at Position A: KE, GPE, EPE
Circle the types of energy present at Position B: KE, GPE, EPE
Circle the types of energy present at Position C: KE, GPE, EPE
At which position does the athlete have the most GPE? C
At what position does the athlete have the most KE? B
At what position does the athlete have the most EPE? A
What happens to KE as the athlete moves upwards? Decreases
What happens to GPE as the athlete moves upwards? Increases
C) power
C) power
16. Holding a rock over your head. Is this work? Yes or No
17. Lifting the rock. Is this work? Yes or No
18. How much work is done in lifting a 690 Newton person 0.5 meters into the air?
(W=Fd) W = 690 * 0.5 = 345 J
19. How much gravitational potential energy does the person in #17 have at the peak of
their jump? (GPE = mgh) mg = w = F; GPEtop = 690 * 0.5 = 345 J
20. How much kinetic energy does the person in #19 have right when they leave the
floor? (hint: law of conservation of energy) GPEtop = KEbottom = 345 J
21. What is the GPE of a 3 kg object that is 10m high? (GPE=mgh; g = 10 m/s2)
GPE = 3 * 10 * 10 = 300 J
22. What is the kinetic energy of a 3 kg object moving 4 m/s? (KE=1/2mv2)
KE = ½ * 3 * 42 = 24 J
25. If the vaulter jumped at a 5 meter height and put in a force of 350N, how much
work did the vaulter use to complete the vault? W = 350 * 5 = 1750 J
26. Based on the amount of work in question #25, how much KE would this vaulter
have at position D? KE = 0 J
27. Based on the work in questions #25, how much GPE would this vaulter have at
position D? W = GPEtop = 1750 J
44. Does Newton’s 3rd Law apply every time forces are applied? YES
The diagram below shows the sequence of an athlete during the long jump. Refer
to the diagram to answer questions 32-40.
32. Draw a free-body diagram of the athlete at Position B. Label the forces.
Mass of
long jumper
Gravity
33. Is the athlete considered a projectile? The athlete is considered a projectile
34. What is the curved path that the athlete follows in the air called? Parabola
35. At what rate does the athlete slow on the way up during his jump? -10 m/s2
36. At what rate does the athlete accelerate toward the ground? 10 m/s2
37. If the athlete’s horizontal speed is 2 m/s when he jumps into the air, what will his
horizontal speed be 2 seconds into the jump? 2 m/s
38. Draw a ticker-tape diagram of the athlete’s horizontal motion in the air.
39. Draw a ticker-tape diagram of the athlete’s vertical motion on the way upward.
40. Draw a ticker-tape diagram of the athlete’s vertical motion on the way down.
41. Forces come in _____pairs_____
42. Forces are _____strength_____ in strength
43. Forces are _____opposite_____ in direction