Unit 7 Test Review

Topics to learn

• Investigate and describe types of forces, including:

  • Contact forces: Forces that occur when two objects are in physical contact.

  • Forces acting at a distance: Includes electrical, magnetic, and gravitational forces.

• Explore the relationship between force and motion.

• Investigate how unbalanced forces can change an object's speed or direction of motion.

• Differentiate between mass and weight.

• Explore the Law of Universal Gravitation.

• Measure and graph distance versus time for objects moving at a constant speed.

• Distinguish between theories and laws with examples.

Vocabulary Definitions

Match the Terms with Definitions:

1. Force: A push or pull exerted on an object.

2. Motion: The action or process of moving or being moved.

3. Mass: The quantity of matter which a body contains.

4. Weight: The force exerted on a body by gravity.

5. Gravity: The force that attracts a body toward the center of the earth or another mass.

6. Speed: The rate at which an object covers distance.

7. Friction: The force opposing motion between two surfaces in contact.

8. Acceleration: The rate of change of velocity per time unit.

9. Inertia: The resistance to any change in an object's velocity.

10. Balanced Forces: Forces equal in size but opposite in direction, resulting in no change in motion.

Multiple Choice Questions

1. Non-contact force example: Gravity

2. Unit of force in the International System of Units: Newton

3. Law stating equal and opposite reaction for every action: Newton's Third Law

4. Gravitational force between two objects does what if distance is doubled: Reduces to one-fourth

5. Acceleration is: The change in velocity per unit time

6. Effect of balanced forces on an object: Remains at rest or moves at a constant speed

7. Relationship between mass and weight: Weight changes with location and mass does not

8. Newton's Second Law describes the relationship between force, mass, and acceleration as: Force = Mass x Acceleration

9. Example of a contact force: Frictional force

10. Primary cause of friction: Roughness of surfaces

True/False Questions

1. Gravity is a force that acts at a distance. (True)

2. An object in motion stays in motion unless acted upon by an unbalanced force. (True)

3. Mass is a measure of the amount of matter in an object. (True)

4. Weight is the same on Earth and the Moon. (False)

5. Friction always acts in the direction of motion. (False)

6. The Law of Universal Gravitation states that every object attracts every other object. (True)

7. Balanced forces cause a change in an object's motion. (False)

8. Speed is a vector quantity. (False)

9. Acceleration can be caused by a change in speed or direction. (True)

10. Inertia is the tendency of an object to resist changes in its motion. (True)