Force & Motion

_______ is a measure of the change in velocity of a moving object.

• Speed

• Direction

• Acceleration

• Force

How will a skydiver's velocity change when a parachute first opens?

• The speed will suddenly decrease.

• The acceleration will suddenly increase.

• The acceleration will stay the same.

• The speed will not change.

_______ is a measure of the change in velocity of a moving object.

• Speed

• Direction

• Vector

• Acceleration

An object is moving with a velocity in the positive direction. If the object experiences an acceleration opposite the direction of its motion it would be a __________ acceleration.

• Negative

• Positive

• Equal

• Net

The change in velocity is a change in speed, ______, or both.

• Acceleration

• Vector

• Direction

• Time

What is the SI unit for acceleration?

• m/s

• N/m²

• km/s²

• m/s²

The acceleration of a moving object can be calculated by dividing the change in velocity by the change in ________.

• Direction

• Distance

• Force

• Time

Velocity includes both speed and ______

• Time

• Distance

• Vector

• Direction

__________ is a force that opposes motion between any surfaces that are touching.

• Force

• Friction

• Sliding

• Acceleration

What should you do to make a surface less slippery?

• Cover the surface with sand

• Polish with grease

• Wax the surface

• None of the above