version 001 - u4q1
this print - out should have 15 questions.
multiple - choice questions may continue on
the next column or page - find all choices
before answering.
001 10.0 points
forces 08 93558
a push or pull that gives energy to an ob -
ject, causing that object to start moving, stop
moving, or change its motion is
1. friction.
2. inertia.
3. a force.
4. pressure.
002 10.0 points
kopp lect6 prob1 93566
one newton is the force
1. that gives a 1 kg body an acceleration of
1 m/s².
2. of gravity on a 1 kg body.
3. that gives a 1 g body an acceleration of
1 cm/s².
4. that gives a 1 kg body an acceleration of
9.8 m/s².
5. of gravity on a 1 g body.
003 10.0 points
office chair 108706
an empty office chair is at rest on a floor.
consider the following forces:
1. a downward force due to gravity;
2. an upward force exerted by the floor; and
3. a net downward force exerted by the air.
which force(s) act on the office chair?
1. 1 and 2 only
2. all three forces
3. none of the forces act on the chair since
it is at rest.
4. 1 only
5. 2 and 3 only
004 10.0 points
conceptual 04 q24 93567
a female gymnast weighs 200 n.
if she is hanging stationary from a high bar,
how many forces are acting on her?
1. five
2. one
3. three
4. two
5. four
005 10.0 points
hewitt cp9 04 e07 92428
an astronaut tosses a rock on the moon.
what force(s) act on the the rock during its
curved path?
1. gravitation force
2. all are wrong.
3. air push
4. friction force
5. air drag
006 10.0 points
concept 13 1 36114
imagine standing on a bathroom scale and
reading your weight. now lift one foot and
read your weight again.
does the scale read more, less or the same
weight when you are standing on one foot?
1. the scale reads lower because the lifted
foot doesnt contribute to the measure -
ment.
2. the readings are the same.
3. it depends on how high a foot is ele -
vated.
4. the scale reads higher because the pres -
sure on the scale is greater.
007 10.0 points
hewitt cp9 05 e05 92316
identify the action - reaction pairs when a base -
ball is being hit.
1. action: ball hits bat. reaction: bat hits
the player.
2. action: bat hits ball. reaction: ball hits
the player.
3. action: ball hits bat. reaction: bat
pushes the arm of the player.
4. action: bat hits ball. reaction: ball hits

Question

Accepted Answer

### Question 001
# Explanation:
## Step1: Recall force definition
A force is defined as a push or pull that can change an object's motion (start, stop, change direction) by transferring energy.
## Step2: Analyze options
- Friction is a type of force (opposing motion), not the general definition.
- Inertia is resistance to motion change, not a push/pull.
- Pressure is force per unit area, not a push/pull causing motion change.
- Option 3 says "a force", which matches the definition.
# Answer: 3. a force.

### Question 002
# Explanation:
## Step1: Recall Newton's second law
Newton's second law: $ F = ma $, where $ F $ is force, $ m $ is mass, $ a $ is acceleration. One Newton is defined as the force that gives a 1 kg mass an acceleration of $ 1 \, \text{m/s}^2 $ (since $ F = 1 \, \text{kg} \times 1 \, \text{m/s}^2 = 1 \, \text{N} $).
## Step2: Analyze options
- Option 1: Matches the definition ($ F = 1 \, \text{kg} \times 1 \, \text{m/s}^2 = 1 \, \text{N} $).
- Option 2: Gravity on 1 kg is $ 9.8 \, \text{N} $, not 1 N.
- Option 3: Units (g, cm/s²) don't match SI for 1 N.
- Option 4: $ 1 \, \text{kg} \times 9.8 \, \text{m/s}^2 = 9.8 \, \text{N} $, not 1 N.
- Option 5: Gravity on 1 g is negligible (not 1 N).
# Answer: 1. that gives a 1 kg body an acceleration of $ 1 \, \text{m/s}^2 $.

### Question 003
# Explanation:
## Step1: Identify forces on the chair
- Gravity: Always acts downward on objects with mass.
- Normal force: Floor exerts upward force to balance gravity (since chair is at rest, net force is zero).
- Air force: The net downward force from air? Air pressure acts in all directions, and for a stationary chair, the net air force is zero (otherwise it would accelerate). So only gravity (1) and normal force (2) act.
## Step2: Analyze options
- Option 1: 1 (gravity) and 2 (normal force) only. This matches, as air's net force is zero (so 3 is incorrect).
- Option 2: All three? No, air's net force is zero.
- Option 3: Forces do act (gravity and normal), so wrong.
- Option 4: Only 1? No, normal force also acts.
- Option 5: 2 and 3? No, 3 is incorrect.
# Answer: 1. 1 and 2 only.

### Question 004 (Incomplete, but assuming we solve the force count)
# Explanation:
## Step1: Identify forces on the gymnast
- Gravity: Pulls her down (200 N, her weight).
- Tension (or normal force) from the bar: Pulls her up (since she's stationary, net force is zero).
## Step2: Count forces
Two forces: gravity (downward) and the bar's upward force.
# Answer: 4. two.

### Question 005
# Explanation:
## Step1: Forces on the moon
The moon has gravity (weaker than Earth's). There's no air on the moon (so no air drag, air push, or friction from air).
## Step2: Analyze options
- Gravitational force: The moon's gravity acts on the rock during its path.
- Air push/drag/friction: No air, so these don't exist.
- Option 2: Wrong, since gravity acts.
# Answer: 1. gravitation force.

### Question 006
# Explanation:
## Step1: Understand scale measurement
A scale measures the normal force it exerts on you, which equals your weight (when stationary, $ F_N = mg $).
## Step2: Analyze standing on one foot
Your mass (and thus weight $ mg $) doesn't change. The scale's normal force still balances your weight, regardless of foot position (pressure changes, but force doesn't).
- Option 1: Wrong, lifted foot doesn't reduce weight (mass is same).
- Option 2: Readings are the same (normal force = weight).
- Option 3: Doesn't depend on foot height (weight is constant).
- Option 4: Pressure increases, but force (scale reading) is same as weight.
# Answer: 2. The readings are the same.

### Question 007
# Explanation:
## Step1: Action-reaction pairs
Newton's third law: Action and reaction are equal and opposite, acting on different objects, and are interactions between two objects.
## Step2: Analyze options
- Option 1: Action (ball-bat) and reaction (bat-player)? No, reaction should be bat-ball (interaction between ball and bat).
- Option 2: Action (bat-ball) and reaction (ball-player)? No, reaction is ball-bat.
- Option 3: Action (ball-bat) and reaction (bat-player's arm)? No, reaction is ball-bat.
- Option 4: Action (bat hits ball) → reaction (ball hits bat) (interaction between bat and ball, equal and opposite). Wait, original option 4: "Action: bat hits ball. Reaction: ball hits the player." No, correction: Wait, correct pair is bat-ball interaction. Wait, recheck:

Wait, correct action-reaction for bat hitting ball: Action is bat exerts force on ball; reaction is ball exerts force on bat. But options:

Wait, option 4: "Action: bat hits ball. Reaction: ball hits the player." No, that's wrong. Wait, option 3: "Action: ball hits bat. Reaction: bat pushes the arm of the player." No. Wait, option 1: "Action: ball hits bat. Reaction: bat hits the player." No. Wait, maybe I misread. Wait, the correct pair is between bat and ball. So action: ball hits bat (ball exerts force on bat), reaction: bat hits ball (bat exerts force on ball). But looking at options:

Option 3: "Action: ball hits bat. Reaction: bat pushes the arm of the player." No. Option 4: "Action: bat hits ball. Reaction: ball hits the player." No. Wait, maybe the options have a typo, but the closest correct logic: When the bat hits the ball (action), the ball hits the bat (reaction). But in the options, option 4's reaction is "ball hits the player" – no. Wait, maybe the intended correct answer is option 4? No, wait, let's re-express:

Action-reaction pairs must be between two objects. When the bat hits the ball (action: bat on ball), the reaction is ball on bat. But the options:

Option 4: "Action: bat hits ball. Reaction: ball hits the player." No, that's ball on player, not bat. Wait, maybe the options are miswritten, but the only pair with bat and ball interaction is option 4 (action bat-ball, reaction ball-bat? No, reaction is ball-bat, but option 4 says ball hits player. Wait, maybe the intended answer is option 4? Or maybe I made a mistake. Wait, let's check again:

Newton's third law: For every action, there is an equal and opposite reaction. The action and reaction forces act on different objects and are of the same type.

When the bat hits the ball (action: bat exerts force on ball), the reaction is the ball exerts force on the bat. But in the options, option 4's reaction is "ball hits the player" – that's a different interaction. Wait, maybe the options are incorrect, but among the choices, option 4 is the only one with bat-ball as action, even if reaction is wrong. Wait, no, option 3: "Action: ball hits bat. Reaction: bat pushes the arm of the player." No. Option 1: "Action: ball hits bat. Reaction: bat hits the player." No. Option 2: "Action: bat hits ball. Reaction: ball hits the player." No. Wait, maybe the correct answer is option 4, assuming a misprint, and the reaction should be ball hits bat. But based on the given options, the best is option 4? Wait, no, let's think again. When the bat hits the ball, the ball's reaction is to hit the bat, but the options don't have that. Wait, maybe the intended answer is option 4, as the only one with bat-ball action.

# Answer: 4. Action: bat hits ball. Reaction: ball hits the player. (Note: Correct reaction should be ball hits bat, but among options, this is the closest action-reaction involving bat and ball.)

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QUESTION IMAGE

Question

Explanation:

Question 001

Step1: Recall force definition

Step2: Analyze options

Step1: Recall Newton's second law

Step2: Analyze options

Step1: Identify forces on the chair

Step2: Analyze options

Answer:

Question 002