The push or pull on an object.

Force or attraction between two objects.

Measure of the force of attraction between an object and Earth. A newton is the metric unit used to measure weight.

Many forces act together on an object.

However, it is not always easy to determine what is exerting a force or what is receiving a force.

When forces are applied in the same direction, the forces are added together. Example: paddling a boat in the same direction helps the boat to go faster.

When forces are applied in opposite directions, subtract the smaller force to determine the direction. Example: tug-a-war

Isaac Newton proposed three laws of motion. His laws combined the findings of other scientists with his own observations.

Isaac Newton is best known for stating that gravity exists throughout the universe.

Process of moving from one place to another.

3 Types of motion

1.Straight line example: walking forward

2.Circular paths example: airplane ride at amusement park

3.Vibrations example: string instruments

compared Change in position of one object compared to the position of another object.

Does the sun move or the Earth?

Rate at which the position of an object changes.

Two units of measure are required to indicate speed. 1.Any unit of time Ex: seconds, minutes, hour 2.Any unit of distance Ex: centimeters, meters

Includes both a speed and a direction.

Speed of a car: 65 miles/hour Velocity of a car: 65 miles/hr to the west

Tells the rate at which velocity is changing, and includes a direction.

Acceleration occurs when a moving object speeds up, slows down, or changes direction.

Any change in velocity is acceleration. Slowing down is negative acceleration.

A car goes from 0 miles/hr to 60 miles/hr in 10 seconds, the average acceleration is 6 miles/hr/second.

Force between surfaces that resists the movement of one surface past another surface.

Friction also exists between an object rolling across another surface.

Newton’s First Law of Motion An object at rest tends to stay at rest and an object in motion tends to stay in motion at the same speed and in the same direction unless acted upon by an unbalanced force.

Newton’s Second Law of Motion Moving objects move in the direction the force is applied.

Newton’s Third Law of Motion For every action there is an equal & opposite reaction.

The tendency for all objects to resist any change in motion.