Which of the following is true about displacement?

• It is always equal to the total path length.

• It is a vector quantity.

• It is always positive.

• It is measured in seconds.

True or False: The path length is always greater than or equal to the magnitude of displacement.

• True

• False

Fill in the blank: The shortest straight-line distance between an object's initial and final position is called ____.

Velocity differs from speed because…

• Velocity is a vector; speed is a scalar.

• Velocity is measured in seconds.

• Speed can be negative.

• Speed includes direction.

What is the formula for average velocity?

• v = d/t

• v = Δx/Δt

• v = at

• v = 2d/t

True or False: If an object moves in a straight line and does not change speed, its velocity and speed are the same.

• True

• False

Acceleration occurs when…

• An object moves in a straight line at constant speed.

• An object's velocity changes.

• An object is at rest.

• An object covers equal distances in equal time intervals.

Which equation represents acceleration?

• a = Δv/Δt

• a = Δx/Δt

• a = v/t

• a = 2x/t^2

True or False: Acceleration always means an object is speeding up.

• True

• False

Newton’s First Law (Law of Inertia) states that…

• An object at rest stays at rest unless acted upon by an external force.

• The acceleration of an object is proportional to the net force applied to it.

• Every action has an equal and opposite reaction.

• Objects fall at 9.81 m/s^2 on Earth.