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Chapter 5 QuickCheck Questions. QuickCheck 5.2. Be sure to study/review Vector River lab. Be sure to review Hooke’s Law. Slide 5-28. QuickCheck 5.2. The net force on an object points to the left. Two of three forces are shown. Which is the missing third force?. A. B. D. C. Slide 5-28.

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quickcheck 5 2
QuickCheck 5.2

Be sure to study/review Vector River lab.

Be sure to review Hooke’s Law.

Slide 5-28

quickcheck 5 21
QuickCheck 5.2

The net force on an object points to the left. Two of three forces are shown. Which is the missing third force?

A.

B.

D.

C.

Slide 5-28

quickcheck 5 22
QuickCheck 5.2

The net force on an object points to the left. Two of three forces are shown. Which is the missing third force?

A.

B.

D.

C.

Vertical components cancel

Slide 5-29

quickcheck 5 3
QuickCheck 5.3

A steel beam hangs from a cable as a crane lifts the beam. What forces act on the beam?

  • Gravity.
  • Gravity and tension in the cable.
  • Gravity and a force of motion.
  • Gravity and tension and a force of motion.

Slide 5-33

quickcheck 5 31
QuickCheck 5.3

A steel beam hangs from a cable as a crane lifts the beam. What forces act on the beam?

  • Gravity.
  • Gravity and tension in the cable.
  • Gravity and a force of motion.
  • Gravity and tension and a force of motion.

Slide 5-34

quickcheck 5 4
QuickCheck 5.4

A book rests on a horizontal table. Gravity pulls down on the book. You may have learned something in a previous physics class about an upward force called the “normal force.” Deep in your heart, do you really believe the table is exerting an upward force on the book?

  • Yes, I’m quite confident the table exerts an upward force on the book.
  • No, I don’t see how the table can exert such a force.
  • I really don’t know.

Slide 5-35

quickcheck 5 5
QuickCheck 5.5

A bobsledder pushes her sled across horizontal snow to get it going, then jumps in. After she jumps in, the sled gradually slows to a halt. What forces act on the sled just after she’s jumped in?

  • Gravity and kinetic friction.
  • Gravity and a normal force.
  • Gravity and the force of the push.
  • Gravity, a normal force, and kinetic friction.
  • Gravity, a normal force, kinetic friction, and the force of the push.

Slide 5-39

quickcheck 5 51
QuickCheck 5.5

A bobsledder pushes her sled across horizontal snow to get it going, then jumps in. After she jumps in, the sled gradually slows to a halt. What forces act on the sled just after she’s jumped in?

  • Gravity and kinetic friction.
  • Gravity and a normal force.
  • Gravity and the force of the push.
  • Gravity, a normal force, and kinetic friction.
  • Gravity, a normal force, kinetic friction, and the force of the push.

Slide 5-40

quickcheck 5 6
QuickCheck 5.6

A cart is pulled to the right with a constant, steady force. How will its acceleration graph look?

A.

B.

C.

Slide 5-58

quickcheck 5 61
QuickCheck 5.6

A cart is pulled to the right with a constant, steady force. How will its acceleration graph look?

A.

B.

C.

A constant force produces a constant acceleration.

Slide 5-59

quickcheck 5 7
QuickCheck 5.7

A constant force causes an object to accelerate at 4 m/s2. What is the acceleration of an object with twice the mass that experiences the same force?

  • 1 m/s2.
  • 2 m/s2.
  • 4 m/s2.
  • 8 m/s2.
  • 16 m/s2.

Slide 5-64

quickcheck 5 71
QuickCheck 5.7

A constant force causes an object to accelerate at 4 m/s2. What is the acceleration of an object with twice the mass that experiences the same force?

  • 1 m/s2.
  • 2 m/s2.
  • 4 m/s2.
  • 8 m/s2.
  • 16 m/s2.

Slide 5-65

quickcheck 5 8
QuickCheck 5.8

An object on a rope is lowered at constant speed. Which is true?

  • The rope tension is greater than the object’s weight.
  • The rope tension equals the object’s weight.
  • The rope tension is less than the object’s weight.
  • The rope tension can’t be compared to the object’s weight.

Slide 5-68

quickcheck 5 81
QuickCheck 5.8

An object on a rope is lowered at constant speed. Which is true?

  • The rope tension is greater than the object’s weight.
  • The rope tension equals the object’s weight.
  • The rope tension is less than the object’s weight.
  • The rope tension can’t be compared to the object’s weight.

Constant velocity

Zero acceleration

Slide 5-69

quickcheck 5 9
QuickCheck 5.9

An object on a rope is lowered at a steadily decreasing speed. Which is true?

  • The rope tension is greater than the object’s weight.
  • The rope tension equals the object’s weight.
  • The rope tension is less than the object’s weight.
  • The rope tension can’t be compared to the object’s weight.

Slide 5-70

quickcheck 5 91

Decreasing downward velocity

Acceleration vector points up

points up

QuickCheck 5.9

An object on a rope is lowered at a steadily decreasing speed. Which is true?

  • The rope tension is greater than the object’s weight.
  • The rope tension equals the object’s weight.
  • The rope tension is less than the object’s weight.
  • The rope tension can’t be compared to the object’s weight.

Slide 5-71

quickcheck 5 11
QuickCheck 5.11

An elevator, lifted by a cable, is moving upward and slowing. Which is the correct free-body diagram?

D.

A.

B.

E.

C.

Slide 5-80

quickcheck 5 111
QuickCheck 5.11

An elevator, lifted by a cable, is moving upward and slowing. Which is the correct free-body diagram?

D.

A.

B.

E.

C.

Slide 5-81

quickcheck 5 12
QuickCheck 5.12

A ball has been tossed straight up. Which is the correct free-body diagram just after the ball has left the hand? Ignore air resistance.

C.

A.

B.

D.

Slide 5-82

quickcheck 5 121
QuickCheck 5.12

A ball has been tossed straight up. Which is the correct free-body diagram just after the ball has left the hand? Ignore air resistance.

No points of contact. Gravity is the only force.

C.

A.

B.

D.

Slide 5-83

quickcheck 6 2
QuickCheck 6.2

A ring, seen from above, is pulled on by three forces. The ring is not moving. How big is the force F?

  • 20 N
  • 10cos N
  • 10sin N
  • 20cos N
  • 20sin N

Slide 6-32

quickcheck 6 21
QuickCheck 6.2

A ring, seen from above, is pulled on by three forces. The ring is not moving. How big is the force F?

  • 20 N
  • 10cos N
  • 10sin N
  • 20cos N
  • 20sin N

Slide 6-33

quickcheck 6 4
QuickCheck 6.4

A car is towed to the right at constant speed. Which is the correct free-body diagram?

Slide 6-41

quickcheck 6 41
QuickCheck 6.4

A car is towed to the right at constant speed. Which is the correct free-body diagram?

Slide 6-42

slide26

QuickCheck 6.6

The box is sitting on the floor of an elevator. The elevator is accelerating upward. The magnitude of the normal force on the box is

  • n > mg.
  • n = mg.
  • n < mg.
  • n = 0.
  • Not enough information to tell.

Slide 6-52

slide27

QuickCheck 6.6

The box is sitting on the floor of an elevator. The elevator is accelerating upward. The magnitude of the normal force on the box is

  • n > mg.
  • n = mg.
  • n < mg.
  • n = 0.
  • Not enough information to tell.

Upward acceleration requires a net upward force.

Slide 6-53

slide28

QuickCheck 6.7

An astronaut takes her bathroom scales to the moon, where g = 1.6 m/s2. On the moon, compared to at home on earth:

  • Her weight is the same and her mass is less.
  • Her weight is less and her mass is less.
  • Her weight is less and her mass is the same.
  • Her weight is the same and her mass is the same.
  • Her weight is zero and her mass is the same.

Slide 6-60

slide29

QuickCheck 6.7

An astronaut takes her bathroom scales to the moon, where g = 1.6 m/s2. On the moon, compared to at home on earth:

  • Her weight is the same and her mass is less.
  • Her weight is less and her mass is less.
  • Her weight is less and her mass is the same.
  • Her weight is the same and her mass is the same.
  • Her weight is zero and her mass is the same.

Slide 6-61

slide30

QuickCheck 6.8

A 50-kg student (mg = 490 N) gets in a 1000-kg elevator at rest and stands on a metric bathroom scale. As the elevator accelerates upward, the scale reads

  • > 490 N.
  • 490 N.
  • < 490 N but not 0 N.
  • 0 N.

Slide 6-63

slide31

QuickCheck 6.8

A 50-kg student (mg = 490 N) gets in a 1000-kg elevator at rest and stands on a metric bathroom scale. As the elevator accelerates upward, the scale reads

  • > 490 N.
  • 490 N.
  • < 490 N but not 0 N.
  • 0 N.

Slide 6-64

slide32

QuickCheck 6.12

A box on a rough surface is pulled by a horizontal rope with tension T. The box is not moving. In this situation:

  • fs > T.
  • fs = T.
  • fs < T.
  • fs = smg.
  • fs = 0.

Slide 6-75

slide33

QuickCheck 6.12

A box on a rough surface is pulled by a horizontal rope with tension T. The box is not moving. In this situation:

  • fs > T.
  • fs = T.
  • fs < T.
  • fs = smg.
  • fs = 0.

Newton’s first law.

Slide 6-76

slide34

QuickCheck 6.13

A box with a weight of 100 N is at rest. It is then pulled by a 30 N horizontal force.

Does the box move?

  • Yes
  • No
  • Not enough information to say.

Slide 6-78

slide35

QuickCheck 6.13

A box with a weight of 100 N is at rest. It is then pulled by a 30 N horizontal force.

Does the box move?

  • Yes
  • No
  • Not enough information to say.

30 N < fs max = 40 N

Slide 6-79

slide36

QuickCheck 6.15

A box is being pulled to the right at steady speed by a rope that angles upward. In this situation:

  • n > mg.
  • n = mg.
  • n < mg.
  • n = 0.
  • Not enough information to judge the size of the normal force.

Slide 6-83

slide37

QuickCheck 6.15

A box is being pulled to the right at steady speed by a rope that angles upward. In this situation:

  • n > mg.
  • n = mg.
  • n < mg.
  • n = 0.
  • Not enough information to judge the size of the normal force.

Slide 6-84

slide38

(sinkcos) – kg.

(cosksin) – kg.

(cosksin) – kg.

 – kg.

T

T

T

T

T

cos – kg.

m

m

m

m

m

QuickCheck 6.16

A box is being pulled to the right by a rope that angles upward. It is accelerating. Its acceleration is

You’ll have to work this one out.

Don’t just guess!

Slide 6-85

slide39

(cosksin) – kg.

(sinkcos) – kg.

(cosksin) – kg.

 – kg.

T

T

T

T

T

cos – kg.

m

m

m

m

m

QuickCheck 6.16

A box is being pulled to the right by a rope that angles upward. It is accelerating. Its acceleration is

Slide 6-86

slide40

QuickCheck 7.10

The top block is accelerated across a frictionless table by the falling mass m. The string is massless, and the pulley is both massless and frictionless. The tension in the string is

  • T < mg.
  • T = mg.
  • T > mg.

Slide 7-78

slide41

QuickCheck 7.10

The top block is accelerated across a frictionless table by the falling mass m. The string is massless, and the pulley is both massless and frictionless. The tension in the string is

  • T < mg.
  • T = mg.
  • T > mg.

Tension has to be less than mg for the block to have a downward acceleration.

Slide 7-79