Powers 7th Assessment PS2-2

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1. What is the force that resists motion between two surfaces that are in contact?

• Gravity
• Friction
• Inertia
• Acceleration

2. In order for you to sit still on a chair, what must be happening?

• At least one force acting on the chair is balanced
• All of the forces acting on the chair are balanced
• The forces acting on the chair are unbalanced
• One of the forces acting on the chair has no mass

3. An example of a balanced force is

• A sled going down a hill
• A person kicking a soccer ball
• A tug-of-war game in which no one wins
• A horse running

4. Unless a balanced force is applied, what will an object do naturally?

• Begin to change direction
• Speed up until it reaches its maximum speed
• Slow down
• Maintain its current speed and direction

5. Which of the following statements does NOT apply to Newton’s Second Law of Motion?

• The acceleration of an object is dependent upon the net force acting upon the object
• The more mass an object has, the more force it takes to move it
• The force required to accelerate an object equals the object’s mass times its acceleration
• If you apply different forces to to objects of the same size, they will accelerate equally

6. Which graph represents an object that is not moving?

• A
• B
• C
• D

7. Which graph shows an object speeding up?

• A
• B
• C
• D

8. Which graph represents and object moving at a constant speed?

• A
• B
• C
• D

9. Which graph represents and object that returns to its starting point?

• A
• B
• C
• D