Forces Unit Study Guide

A Force has both:

• Speed and Distance
• Magnitude and Direction
• Speed and Magnitude
• Speed and Direction

Force equals mass times

• Friction
• Tension
• Acceleration
• Inertia

Acceleration can be defined as

• The rate at which velocity changes over time
• A push, pull, twist, or rub
• The force that resists stretching or pressing
• A force that resists the motion between two surfaces in contact

If the same force is applied to two objects of different mass, which object will have the greater acceleration?

• The object with more mass
• The object with less mass
• The masses that are the same
• Mass does not matter

A more massive object requires _______ force to accelerate it at the same rate as a less massive object.

• greater
• smaller
• same
• less

How can an object accelerate when it does not change speed?

• It can speed up
• It can slow down
• It can change direction
• It is not possible

A car traveling at a constant speed turns to the east and continues at the same speed. The car has

• changed speed
• slowed down
• accelerated
• not changed

A push, pull, twist, or rub is called

• motion
• force
• acceleration
• velocity

An object accelerates (changes motion) when...

• All forces on the object are balanced
• the acceleration on the object is zero
• the forces acting on the object are unbalanced
• gravity equals the normal force

Two rocks of different mass are dropped from the same height at the same moment. If there is no air friction, which is the most correct statement?

• The heavy rock accelerates faster and with more force.
• Both rocks show the same acceleration and the same force.
• Both rocks show the same acceleration, but the heavy rock has more force.
• The light rock accelerates faster, but hits with less force.