1. Chapter 5

2. A Martian lander is approaching the surface
A Martian lander is approaching the surface. It is slowing its descent by firing its rocket motor. Which is the correct free-body diagram for the lander?
STT5.1

3. A Martian lander is approaching the surface
A Martian lander is approaching the surface. It is slowing its descent by firing its rocket motor. Which is the correct free-body diagram for the lander?
STT5.1

4. More than your true weight. Less than your true weight.
An elevator that has descended from the 50th floor is coming to a halt at the 1st floor. As it does, your apparent weight is
More than your true weight.
Less than your true weight.
Equal to your true weight.
Zero.
STT5.2

5. More than your true weight. Less than your true weight.
An elevator that has descended from the 50th floor is coming to a halt at the 1st floor. As it does, your apparent weight is
More than your true weight.
Less than your true weight.
Equal to your true weight.
Zero.
STT5.2

6. Rank order, from largest to smallest, the size of the
friction forces to
in these 5 different situations.
The box and the floor are made of the same materials in all situations.
fc > fd > fe > fb > fa.
fb > fc > fd > fe > fa.
fa > fc = fd = fe > fb.
fa = fb > fc = fd = fe.
fb > fc = fd = fe > fa.
STT5.3

7. Rank order, from largest to smallest, the size of the
friction forces to
in these 5 different situations.
The box and the floor are made of the same materials in all situations.
fc > fd > fe > fb > fa.
fb > fc > fd > fe > fa.
fa > fc = fd = fe > fb.
fa = fb > fc = fd = fe.
fb > fc = fd = fe > fa.
STT5.3

8. The terminal speed of a Styrofoam ball is 15 m/s
The terminal speed of a Styrofoam ball is 15 m/s. Suppose a Styrofoam ball is shot straight down with an initial speed of 30 m/s. Which velocity graph is correct?
STT5.4

9. The terminal speed of a Styrofoam ball is 15 m/s
The terminal speed of a Styrofoam ball is 15 m/s. Suppose a Styrofoam ball is shot straight down with an initial speed of 30 m/s. Which velocity graph is correct?
STT5.4

10. (Ug)1 > (Ug)2 > (Ug)3 > (Ug)4
Rank in order, from largest to smallest, the gravitational potential energies of balls 1 to 4.
(Ug)1 > (Ug)2 > (Ug)3 > (Ug)4
(Ug)4 > (Ug)3 > (Ug)2 > (Ug)1
(Ug)1 > (Ug)2 = (Ug)4 > (Ug)3
(Ug)3 > (Ug)2 = (Ug)4 > (Ug)1
(Ug)4 = (Ug)2 > (Ug)3 > (Ug)1
STT10.1

11. (Ug)1 > (Ug)2 > (Ug)3 > (Ug)4
Rank in order, from largest to smallest, the gravitational potential energies of balls 1 to 4.
(Ug)1 > (Ug)2 > (Ug)3 > (Ug)4
(Ug)4 > (Ug)3 > (Ug)2 > (Ug)1
(Ug)1 > (Ug)2 = (Ug)4 > (Ug)3
(Ug)3 > (Ug)2 = (Ug)4 > (Ug)1
(Ug)4 = (Ug)2 > (Ug)3 > (Ug)1
STT10.1

12. vD > vA > vB > vC vC > vA = vB > vD
A small child slides down the four frictionless slides A–D. Each has the same height. Rank in order, from largest to smallest, her speeds vA to vD at the bottom.
vA = vB = vC = vD
vD > vA = vB > vC
vD > vA > vB > vC
vC > vA = vB > vD
vC > vB > vA > vD
STT10.2

13. vD > vA > vB > vC vC > vA = vB > vD
A small child slides down the four frictionless slides A–D. Each has the same height. Rank in order, from largest to smallest, her speeds vA to vD at the bottom.
vA = vB = vC = vD
vD > vA = vB > vC
vD > vA > vB > vC
vC > vA = vB > vD
vC > vB > vA > vD
STT10.2

14. A box slides along the frictionless surface shown in the figure
A box slides along the frictionless surface shown in the figure. It is released from rest at the position shown. Is the highest point the box reaches on the other side at level a, at level b, or level c?
STT10.3
At level a
At level b
At level c

15. A box slides along the frictionless surface shown in the figure
A box slides along the frictionless surface shown in the figure. It is released from rest at the position shown. Is the highest point the box reaches on the other side at level a, at level b, or level c?
STT10.3
At level a
At level b
At level c

16. The graph shows force versus displacement for three springs
The graph shows force versus displacement for three springs. Rank in order, from largest to smallest, the spring constants k1, k2, and k3.
k3 > k2 > k1
k1 = k3 > k2
k2 > k1 = k3
k1 > k2 > k3
k1 > k3 > k2
STT10.4

17. The graph shows force versus displacement for three springs
The graph shows force versus displacement for three springs. Rank in order, from largest to smallest, the spring constants k1, k2, and k3.
k3 > k2 > k1
k1 = k3 > k2
k2 > k1 = k3
k1 > k2 > k3
k1 > k3 > k2
STT10.4

18. There is no transformation because energy is conserved.
A child slides down a playground slide at constant speed. The energy transformation is
There is no transformation because energy is conserved.
STT11.1

19. There is no transformation because energy is conserved.
A child slides down a playground slide at constant speed. The energy transformation is
STT11.1
There is no transformation because energy is conserved.

20. A particle moving along the x-axis experiences the force shown in the graph. If the particle has 2.0 J of kinetic energy as it passes x = 0 m, what is its kinetic energy when it reaches x = 4 m?
−2.0 J
0.0 J
2.0 J
4.0 J
6.0 J
STT11.2

21. A particle moving along the x-axis experiences the force shown in the graph. If the particle has 2.0 J of kinetic energy as it passes x = 0 m, what is its kinetic energy when it reaches x = 4 m?
−2.0 J
0.0 J
2.0 J
4.0 J
6.0 J
STT11.2

22. Wg is positive and WT is positive. Wg is negative and WT is negative.
A crane lowers a steel girder into place at a construction site. The girder moves with constant speed. Consider the work Wg done by gravity and the work WT done by the tension in the cable. Which of the following is correct?
Wg is positive and WT is positive.
Wg is negative and WT is negative.
Wg is positive and WT is negative.
Wg and WT are both zero.
Wg is negative and WT is positive.
STT11.3

23. Wg is positive and WT is positive. Wg is negative and WT is negative.
A crane lowers a steel girder into place at a construction site. The girder moves with constant speed. Consider the work Wg done by gravity and the work WT done by the tension in the cable. Which of the following is correct?
Wg is positive and WT is positive.
Wg is negative and WT is negative.
Wg is positive and WT is negative.
Wg and WT are both zero.
Wg is negative and WT is positive.
STT11.3

24. Which force does the most work?
The 6 N force.
The 8 N force.
The 10 N force.
They all do the same amount of work.
STT11.4

25. Which force does the most work?
The 6 N force.
The 8 N force.
The 10 N force.
They all do the same amount of work.
STT11.4

26. A particle moves along the x-axis with the potential energy shown
A particle moves along the x-axis with the potential energy shown. The force on the particle when it is at x = 4 m is
4 N.
2 N.
1 N.
–1 N.
–2 N.
STT11.5

27. A particle moves along the x-axis with the potential energy shown
A particle moves along the x-axis with the potential energy shown. The force on the particle when it is at x = 4 m is
4 N.
2 N.
1 N.
–1 N.
–2 N.
STT11.5

28. U ® Eth. Emech is conserved.
A child at the playground slides down a pole at constant speed. This is a situation in which
U ® Eth. Emech is conserved.
U ® K. Emech is not conserved but Esys is.
K ® Eth. Emech is not conserved but Esys is.
U ® Eth. Emech is not conserved but Esys is.
U ® Wext. Neither Emech nor Esys are conserved.
STT11.6

29. U ® Eth. Emech is conserved.
A child at the playground slides down a pole at constant speed. This is a situation in which
U ® Eth. Emech is conserved.
U ® K. Emech is not conserved but Esys is.
K ® Eth. Emech is not conserved but Esys is.
U ® Eth. Emech is not conserved but Esys is.
U ® Wext. Neither Emech nor Esys are conserved.
STT11.6

30. Pd > Pb > Pa > Pc Pb > Pa > Pc > Pd
Four students run up the stairs in the time shown. Rank in order, from largest to smallest, their power outputs Pa to Pd.
Pb > Pa = Pc > Pd
Pd > Pa = Pb > Pc
Pd > Pb > Pa > Pc
Pb > Pa > Pc > Pd
Pc > Pb = Pa > Pd
STT11.7

31. Pd > Pb > Pa > Pc Pb > Pa > Pc > Pd
Four students run up the stairs in the time shown. Rank in order, from largest to smallest, their power outputs Pa to Pd.
Pb > Pa = Pc > Pd
Pd > Pa = Pb > Pc
Pd > Pb > Pa > Pc
Pb > Pa > Pc > Pd
Pc > Pb = Pa > Pd
STT11.7

32. A spring-loaded gun shoots a plastic ball with a speed of 4 m/s
A spring-loaded gun shoots a plastic ball with a speed of 4 m/s. If the spring is compressed twice as far, the ball’s speed will be
16 m/s.
8 m/s.
4 m/s.
2 m/s.
1 m/s.
STT10.5

33. A spring-loaded gun shoots a plastic ball with a speed of 4 m/s
A spring-loaded gun shoots a plastic ball with a speed of 4 m/s. If the spring is compressed twice as far, the ball’s speed will be
16 m/s.
8 m/s.
4 m/s.
2 m/s.
1 m/s.
STT10.5

34. A particle with the potential energy shown in the graph is moving to the right. It has 1 J of kinetic energy at x = 1 m. Where is the particle’s turning point?
x = 2 m
x = 3 m
x = 4 m
x = 5 m
x = 6 m
STT10.6

35. A particle with the potential energy shown in the graph is moving to the right. It has 1 J of kinetic energy at x = 1 m. Where is the particle’s turning point?
x = 2 m
x = 3 m
x = 4 m
x = 5 m
x = 6 m
STT10.6

36. Chapter 5
Reading Quiz

37. Hooke’s law describes the force of
gravity.
tension.
a spring.
collisions.
none of the above.
IG10.2

38. Hooke’s law describes the force of
gravity.
tension.
a spring.
collisions.
none of the above.
IG10.2

39. A perfectly elastic collision is a collision
between two springs.
that conserves potential energy.
that conserves thermal energy.
that conserves kinetic energy.
All of B, C, and D.
IG10.3

40. A perfectly elastic collision is a collision
between two springs.
that conserves potential energy.
that conserves thermal energy.
that conserves kinetic energy.
All of B, C, and D.
IG10.3

41. The coefficient of static friction is
smaller than the coefficient of kinetic friction.
equal to the coefficient of kinetic friction.
larger than the coefficient of kinetic friction.
not discussed in this chapter.
IG5.3

42. The coefficient of static friction is
smaller than the coefficient of kinetic friction.
equal to the coefficient of kinetic friction.
larger than the coefficient of kinetic friction.
not discussed in this chapter.
IG5.3

43. The statement ∆K = W is called the
law of conservation of energy.
work-kinetic energy theorem.
kinetic energy equation.
weight-kinetic energy theorem.
IG11.2

44. The statement ∆K = W is called the
law of conservation of energy.
work-kinetic energy theorem.
kinetic energy equation.
weight-kinetic energy theorem.
IG11.2

45. Energy transformations.
The transfer of energy to a system by the application of a force is called
Dot product.
Power.
Work.
Watt.
Energy transformations.
IG11.3

46. Energy transformations.
The transfer of energy to a system by the application of a force is called
Dot product.
Power.
Work.
Watt.
Energy transformations.
IG11.3