Unit 2 - Forces and Motion

What is the meaning of the slope for a position vs time graph?

• It represents the object's velocity

• It represents the object's acceleration
• It represents the object's displacement
• It represents the object's time

In a position time graph, if the line is going at a constant speed, there is no acceleration! If the line is horizontal, it has zero velocity!

• True, True
• True, False
• False, True
• False, False

When calculating the distance in a position time graph, add all the distance! Distance does not have negatives, and you should not count distance if the line is horizontal!

• Add all distances, including negatives and horizontal lines
• Only add positive distances and ignore horizontal lines
• Only add positive distances and include horizontal lines
• Add all distances, including negatives but ignore horizontal lines

An object at rest and constant speed can be represented by the same free body diagram as they both have zero velocity

• True
• False
• Depends on the object
• Depends on the speed

An object at rest could have forces be all equal on it!

• True
• False
• Maybe
• Depends on the object

Which of the free body

diagrams could represent the forces

acting on the physicist from t = 0 s to t

= 3 s?

HINT : What does the line represent on a position time graph?

• B

• D

• A

• C

Which of the free body

diagrams could represent the forces

acting on the physicist from t = 3 s to t

= 5 s?

HINT: What does the line on a position time graph represent?

• B

• D

• C

• A

This test paper sitting on your

desk is at rest. Therefore, it has no

forces acting on it.

• True, there are no forces acting on it
• False, there is the force of gravity acting on it
• False, there is the force of friction acting on it
• False, there are both gravity and friction forces acting on it

what are the forces acting on a ice for a punk on a friction less force

• Gravity and normal force
• Friction and air resistance
• Gravity and friction
• Gravity, normal force and friction

Mass is a quantitative measurement of:

• The volume of an object
• The color of an object
• The weight of an object
• The amount of inertia