Science Vocabulary

Physics

Motion

The action or process of moving or being moved.

Mass

A coherent, typically large body of matter with no definite shape.

Force

Strength or energy of physical action or movement.

Balanced Forces

Equal forces acting on an object in opposite directions.

Unbalanced Forces

An equal force acting on an object causing it to move in one direction.

Work

Force exerted on an object that causes it to move.

Speed

Distance travelled per unit time.

Distance

The amount of space between two things or people or the length of a race.

Time

The amount of time that is left, has past, or currently is.

Velocity

A variable that tells you both speed and direction.

Acceleration

Change in velocity divided by the time it takes for the change to occur.

Deceleration

A decrease in speed.

Energy

Capacity to do work.

Newton's Law of Inertia

An object in motion (or at rest) will tend to stay in motion (or at rest) until it is acted upon by an outside force.

Newton's Law of Force and Acceleration

The force acting on a body is proportional to its mass times acceleration.

Newton's Law of Action/Reaction

For every action there is an equal and opposite reaction force.

Displacement

Distance and direction of an object's change in position from the starting point.

Friction

A force that opposes motion between two surfaces that are in contact.

Free Fall

The motion of a falling object when the only force acting on it is gravity.

Momentum

The quantity of motion of a moving body, measured as a product of its mass and velocity.

Projectile

An object thrown into the air with great force.

Period

A length or portion of time.

Frequency

The amount of times something happens in a certain amount of time.

Centripetal Force

A force that causes an object to move in a circle.

Centripetal Acceleration

Acceleration toward the center of a curved or circular path.

Newton

A unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second.

Inertia

Resistance of an object to a change in its motion.