NEWTON'S LESSON 1 HOMEWORK Free-body diagrams for four situations are shown below. For each situation, determine the net force acting upon the object. Situation A Ffrict 5 N ↑Fnorm =3N Fapp = 5 N Fgray = 3 N Situation C Form= 20 N Fgray 20 N Situation B Ffrict 5 N <=3N norm Fgrav=3 N Situation D Fair 40 N Fgray = 25 N 1. Imagine a place in the cosmos far from all gravitational and frictional influences. Suppose that you visit that place (just suppose) and throw a rock. The rock will do what and why? 2. A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving at this speed and in this direction? 3. Mac and Tosh are arguing in the cafeteria. Mac says that if he flings the Jell-O with a greater speed it will have a greater inertia. Tosh argues that inertia does not depend upon speed, but rather upon mass. Who do you agree with? Explain why.

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Chapter4: Dynamics: Force And Newton's Laws Of Motion
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4. Supposing you were in space in a weightless environment, would it require a force to set an
object in motion?
5. Fred spends most Sunday afternoons at rest on the sofa, watching pro football games and
consuming large quantities of food. What effect (if any) does this practice have upon his inertia?
Explain.
6. Ben Tooclose is being chased through the woods by a bull moose which he was attempting to
photograph. The enormous mass of the bull moose is extremely intimidating. Yet, if Ben makes a
zigzag pattern through the woods, he will be able to use the large mass of the moose to his own
advantage. Explain this in terms of inertia and Newton's first law of motion.
7. Two bricks are resting on edge of the lab table. Shirley Sheshort stands on her toes and spots
the two bricks. She acquires an intense desire to know which of the two bricks are most
massive. Since Shirley is vertically challenged, she is unable to reach high enough and lift the
bricks; she can however reach high enough to give the bricks a push. Discuss how the process of
pushing the bricks will allow Shirley to determine which of the two bricks is most massive. What
difference will Shirley observe and how can this observation lead to the necessary conclusion?
8. Whiplash sometimes results from an automobile accident when the victim's car is struck
violently from the rear. Explain why the head of the victim seems to be thrown backward in this
situation. Is it really? Do headrests really help prevent whiplash injuries? Why?
Transcribed Image Text:4. Supposing you were in space in a weightless environment, would it require a force to set an object in motion? 5. Fred spends most Sunday afternoons at rest on the sofa, watching pro football games and consuming large quantities of food. What effect (if any) does this practice have upon his inertia? Explain. 6. Ben Tooclose is being chased through the woods by a bull moose which he was attempting to photograph. The enormous mass of the bull moose is extremely intimidating. Yet, if Ben makes a zigzag pattern through the woods, he will be able to use the large mass of the moose to his own advantage. Explain this in terms of inertia and Newton's first law of motion. 7. Two bricks are resting on edge of the lab table. Shirley Sheshort stands on her toes and spots the two bricks. She acquires an intense desire to know which of the two bricks are most massive. Since Shirley is vertically challenged, she is unable to reach high enough and lift the bricks; she can however reach high enough to give the bricks a push. Discuss how the process of pushing the bricks will allow Shirley to determine which of the two bricks is most massive. What difference will Shirley observe and how can this observation lead to the necessary conclusion? 8. Whiplash sometimes results from an automobile accident when the victim's car is struck violently from the rear. Explain why the head of the victim seems to be thrown backward in this situation. Is it really? Do headrests really help prevent whiplash injuries? Why?
NEWTON'S LESSON 1 HOMEWORK
Free-body diagrams for four situations are shown below. For each situation, determine the net
force acting upon the object.
Situation A
Ffrict 5 N
= 3 N
Fnorm
app = 5 H
Fgray = 3 N
Situation C
Form= 20 N
Fgray= 20 N
Situation B
Ffrict 5 N
= 3 N
Fnorm
Fgrav= 3 N
Situation D
Fair 40 N
Fgray = 25 N
1. Imagine a place in the cosmos far from all gravitational and frictional influences. Suppose that
you visit that place (just suppose) and throw a rock. The rock will do what and why?
2. A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to
keep the object moving at this speed and in this direction?
3. Mac and Tosh are arguing in the cafeteria. Mac says that if he flings the Jell-O with a greater
speed it will have a greater inertia. Tosh argues that inertia does not depend upon speed, but
rather upon mass. Who do you agree with? Explain why.
Transcribed Image Text:NEWTON'S LESSON 1 HOMEWORK Free-body diagrams for four situations are shown below. For each situation, determine the net force acting upon the object. Situation A Ffrict 5 N = 3 N Fnorm app = 5 H Fgray = 3 N Situation C Form= 20 N Fgray= 20 N Situation B Ffrict 5 N = 3 N Fnorm Fgrav= 3 N Situation D Fair 40 N Fgray = 25 N 1. Imagine a place in the cosmos far from all gravitational and frictional influences. Suppose that you visit that place (just suppose) and throw a rock. The rock will do what and why? 2. A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving at this speed and in this direction? 3. Mac and Tosh are arguing in the cafeteria. Mac says that if he flings the Jell-O with a greater speed it will have a greater inertia. Tosh argues that inertia does not depend upon speed, but rather upon mass. Who do you agree with? Explain why.
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