Force and Motion

Front

Force that opposes the motion of any object

Back

friction

Front

An object's motion will not change unless an unbalanced force acts on it.

Back

law of inertia

Front

Factor that determines the inertia of an object

Back

mass

Front

Type of force needed to overcome inertia of an object: friction, balanced force, unbalanced force, net force

Back

unbalanced force

Front

Tendency of an object to resist a change in motion

Back

inertia

Front

The speed of an object changes only when it is acted on by:

a balanced force

,

an unbalanced force

,

acceleration

,

friction

Back

an unbalanced force

Front

If an object is at rest, what will keep it at rest?

Back

inertia

Front

If an equal force acts on each of the following objects, which will have the GREATEST acceleration? Options: golf ball, soccer ball, football, baseball

Back

golf ball

Front

Inertia explains why:

• friction can be overcome for all objects
• people in a car move forward in their seats when the car stops quickly
• the ground pushes against your feet when you run
• gravitational forces are stronger on Earth than on the Moon

Back

people in a car move forward in their seats when the car stops quickly

Front

In which situation are the forces operating on an object unbalanced? Options: A stack of books rests on a table. A car has a constant motion of 60 miles per hour. Two sides of a balance both support 20 kg. A baseball falls at a faster and faster speed.

Back

A baseball falls at a faster and faster speed.