Forces Vocabulary

Air resistance is:

• a force that opposes the motion of objects through air

• the weight of an object in air

• the speed at which an object falls

• a type of energy produced by moving air

The angle of inclination is:

• the angle made by a line with the positive direction of the x-axis

• the angle between two parallel lines

• the angle formed by two intersecting circles

• the angle between a radius and a tangent

Applied force is:

• a force that is put on an object by another object or person

• the force that resists motion between two surfaces

• the force that pulls objects toward the center of the Earth

• the force that acts at a distance without contact

Balanced force is:

• a force where two equal forces act in opposite directions and cancel each other out

• a force that always causes motion

• a force that only acts in one direction

• a force that increases the speed of an object

Contact force is:

• a force that acts only when two objects are physically touching each other

• a force that acts at a distance without physical contact

• a type of energy transfer between objects

• a force that cannot be measured

Effort arm is:

• the distance between the fulcrum and the point where effort is applied

• the distance between the fulcrum and the point where load is applied

• the force applied to move the load

• the fixed point about which a lever rotates

Effort force is:

• the force applied to a machine to make it work.

• the resistance force that opposes motion.

• the weight of the object being lifted.

• the distance over which a force is applied.

Elastic force is:

• the force that allows objects to return to their original shape after being stretched or compressed

• the force that opposes motion between two surfaces

• the force that pulls objects toward the center of the Earth

• the force that acts at a distance without contact

Force is defined as:

• A push or pull acting on an object

• The speed of an object

• The color of an object

• The temperature of an object

A force exerted by a person, animal or machine: When a girl kicks a ball, an applied force acts between her foot and the ball. What is this force called?

• A force exerted by a person, animal or machine is called an applied force.

• A force exerted by a person, animal or machine is called a frictional force.

• A force exerted by a person, animal or machine is called a gravitational force.

• A force exerted by a person, animal or machine is called a magnetic force.