Vocabulary - Forces and Motion

An example of force is ...

• you pull on a door to open it.

• you stared at the teacher.

• sitting still.

• going to sleep.

Motion is ...

• the action or process of moving or being moved.

• standing still.

• being frozen.

• mass.

Mass means ...

• an object.

• how fast you can move.

• the pull of an object.

• density of an object.

Increasing speed, decreasing speed, or changing direction

• Mass

• gravity

• weight

• acceleration

The combination of all forces acting on an object

• net force

• net power

• direction

• position

speed in a given direction

• slope

• velocity

• inertia

• position

the force that two surfaces exert on each other when they rub against each other. There are three types: static, sliding, rolling, fluid

• static

• inertia

• friction

• net force

– the distance an object travels per unit of time. Speed Calculation: Speed = Distance / Time

• speed

• distance

• time

• location

Unbalanced forces can cause an object to start moving, stop moving or change direction. The net force is greater than zero.

• True

• False

Balanced forces are equal forces acting on one object in opposite directions. The net force is zero.

• True

• False