Activity 3-1 Chapter 3 Review Worksheet Answers Physics

Chapter 3 Respond Key

Written report Guide

My Notebook

1. Answers will vary, simply could include main ideas from the summary or 1 main idea from each Reading (iii).
2. Answers will vary, just should include three different explanations for the word "pound": (a) customary unit of weight, or force, on a scale (noun); (b) to hitting or strike with slap-up force (verb); (c) devious dogs or cats are often taken to a local building chosen a "pound" and held until an owner is institute (noun).
3. (a) The force crusade by the person is to the right (or forward). (b) Friction is pushing against the box to the left. (c) The person's force it greater than friction because the figure says box is moving right or forrad.

Guided Reading

three.ane Forces

1. attracts
2. weight
3. pounds
4. direction

3.2 Friction

5. friction
6. surfaces
7. reduces

3.3 Forces and Equilibrium

8. balanced
9. speed
10. unbalanced

Let's Review

1. c
2. a

Bank check Your Understanding

Reading 3.1

1. newton, pound
2. direction and strength of the force
3. Answers are:
1. 600 N
2. 45 N
3. 15 Due north
4. Contact forces simply act when objects are touching each other. Forces that act through a field can exist when the objects are not touching.
5. The force increases.
6. Your mass does not change if you get to the Moon, but your weight decreases. Your weight depends on the strength of gravity, and gravity is weaker on the Moon.
7. 160 Due north
8. 4 kg

Reading 3.2

1. sliding friction, rolling friction, static friction, air friction
2. Ice has a sparse layer of water on summit of it, so objects easily slide on the h2o.
3. If you are sitting on a chair that is on a floor that is non perfectly level, friction helps y'all stay on the chair.
4. Oil reduces friction in the machine's engine.
5. B and D
6. The force of friction increases.
7. Ball bearings, nonstick coating on frying pans, and air hockey tables all reduce friction.
8. Safety soles on rock climbing shoes, brakes on a car and the tread on a bicycle tire all increment friction.
9. False. It's not possible to completely get rid of friction.
10. D
11. Fake. Friction converts the energy of move into heat.
12. H2o reduces friction between two surfaces considering it keeps the surfaces from touching. However, friction between h2o and an individual surface causes information technology to wear abroad. Water running over rocks causes the irregular tiny bits on the surface of the rocks to pause off. This happens gradually over a very long catamenia of fourth dimension.

Reading 3.iii

1. When all forces are balanced, the internet force is goose egg.

2. Yeah. If an object is moving at a abiding velocity, then the net forcefulness is zero.
3. v N
4. nine N to the correct
5. A
6. 175,000 N
7. Answers may vary. Students should recognize that force from the person'due south weight and a normal force from the flooring or chair are present. Students may infer that the chair provides only part of the normal force if the person's feet are on the footing. In that case the floor would provide a normal strength too. Sample reply on right:
   
8. B
9. 100 N

Connexion: Forces in Equilibrium

1. Answers may vary. Two of the activity-reaction pairs in a typical building are: The weight of the roof as a downward strength and the load-bearing walls as an up strength; The weight of the wall-roof structure every bit a downward force and the foundation providing the upward force.
2. New York City is an ideal place for skyscrapers because information technology has a thick layer of stable bedrock just below the topsoil, providing a very solid base on which to build a foundation for a tall, heavy structure.
3. Brunelleschi's dome design featured a double-wall structure. The dome was synthetic using a great deal of brick. Brunelleschi also used timbers linked together with metal fasteners to balance the outward forces on the dome. The linked timbers served a role similar to hoops on a butt.

Action: Friction and Forces

1. Answers may vary.
2. Answers may vary.
3. Answers may vary.
4. Answers may vary.
5. Answers may vary.

Chapter 3 Review

Vocabulary

Reading three.1

1. strength
2. pound
3. newton
4. weight
5. pinch
6. tension
7. free energy
8. vector
9. extension
10. kilogram
11. mass
12. matter
13. gram

Reading 3.2

14. friction
15. sliding friction
16. static friction

Reading 3.three

17. balanced
18. equilibrium
19. normal force
20. gratis-torso diagram
21. net force

Concepts

Reading three.ane

1. Objects with free energy are able to change themselves or other objects.
2. strong nuclear force, electromagnetic force, weak force, gravity
3. Weight is the forcefulness of gravity pulling on an object.
4. The force of the h2o against a boat'due south propeller allows the boat to accelerate. The strength of a bicycle's brakes slows information technology down. The force of friction betwixt a car's tires and the road allows the car to turn.
5. forcefulness and direction
6. Answers are:
1. 
2. 
   
3. 
   
7. Friction is a contact force. The force of gravity acts through a force field.
8. The strength increases in strength.
9. Compression and extension are both forces in springs. They both increase in strength when the spring is moved farther from its natural length. Compression is a decrease in a spring'south length, and extension is an increase in length.
10. Answers are:
1. mass
2. force
3. strength
4. mass
11. Weight is a measure of the force of gravity on an object. An object with a greater mass too has a greater weight.

Reading 3.ii

12. There is a layer of liquid h2o between the blade and the ice.
13. More force is needed to start an object sliding. Static friction is unremarkably greater than sliding friction.
14. Sliding friction is less when an object weighs less. A heavier object pushes harder into the irregularities on the surface, making friction greater.
15. Friction tin can be reduced with liquids such as oil or with ball bearings.
16. If you try to pull a nail upward, friction acts downwardly to keep the nail in. The direction of friction is confronting the management the nail is trying to move. The friction acts between the nail and the wood or other material the nail is hammered into.
17. Friction changes the free energy of motility into heat.

Reading iii.three

18. An object can be moving if the net strength is goose egg. It must be moving at a constant velocity.
19. Answers are:
1. normal force
2. upwards
3. The strength of the normal force is the same as the strength of the forcefulness of gravity on the object.
20. The racecar is slowing down because the internet force is against the motility of the car.
21. Answers are:
1. drag, lift, thrust, and weight
2. drag and thrust
3. lift and weight
22. Answers are:
1. air resistance
2. 
   

Math and Writing Skills

Reading 3.ane

1. 222 N
2. 
   
3. 4 cm
4. lxx Due north
5. 49 North
6. 45 kg
7. 392 N
8. 5102 kg
9. Her mass would be 60 kg. Her weight would be 222 Northward.

Reading 3.two

10. xl North
11. Cars are designed with an aerodynamic shape to reduce air resistance. Their wheels have bearings that allow them to roll smoothly. The tires on a automobile are fabricated of prophylactic considering information technology creates a large friction forcefulness against the road.

Reading 3.3

12. Answers are:
1. forty Northward left
2. 25 N up
13. The normal force is 9 N. It can exist increased past putting other books on peak of the first volume or by pressing down on the volume.
14. Yes, if the 100 N forcefulness and the 200 North force are pointing in the aforementioned direction, and the 300 N force is pointed in the opposite management, so the forces will be in equilibrium.
    
15. The unknown scale reads 550 N.
    
16. Yes, the box is in equilibrium. All of the forces are balanced.
17. Answers are:
1. sliding friction
2. 75 Due north
3. 
   
18. Answers are:
1. static friction
2. 
   

Test Practice

1. A
2. C
3. C
4. B

Projection

Criteria	Fantabulous	Good	Needs some comeback	Needs much improvement	Your score
Car is completed on time and meets the design criteria	4	3	ii	one
Automobile is able to travel 5 meters	4	3	2	1
Car performs well in speed contest	4	3	2	one
Affiche includes diagram of structure, shows how the condom ring moves the car, and includes competition information	4	3	2	i
Overall design, creativity, and construction	4	3	2	i
Total

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