The push or pull on The push or pull on an object.an object.

Force or Force or attraction attraction between two between two objects.objects.

Measure of the force of Measure of the force of attraction between an attraction between an object and Earth.object and Earth.

A newton is the metric A newton is the metric unit used to measure unit used to measure weight.weight.

Many forces act Many forces act together on an together on an object.object.

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

When forces are When forces are applied in the same applied in the same direction, the forces direction, the forces are added together.are added together.

Example: paddling a boat Example: paddling a boat in the same direction helps in the same direction helps the boat to go faster.the boat to go faster.

When forces are applied in When forces are applied in opposite directions, opposite directions, subtract the smaller force subtract the smaller force to determine the direction.to determine the direction.

Example: tug-a-Example: tug-a-warwar

Isaac Newton proposed Isaac Newton proposed three laws of motion.three laws of motion.

His laws combined the His laws combined the findings of other findings of other scientists with his own scientists with his own observations.observations.

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

Process of moving Process of moving from one place to from one place to another.another.

3 Types of 3 Types of motionmotion

1.1.Straight lineStraight line

example: walking example: walking forwardforward

2.2.Circular pathsCircular paths

example: airplane example: airplane ride at amusement ride at amusement parkpark

3.3.VibrationsVibrations

example: string example: string instrumentsinstruments

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

Does the sun Does the sun movemove

or the or the Earth?Earth?

Rate at which the Rate at which the position of an object position of an object changes.changes.

Two units of measure are required to indicate speed.

1.Any unit of timeEx: seconds, minutes, hour

2.Any unit of distanceEx: centimeters, meters

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

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

Any change in Any change in velocity is velocity is acceleration.acceleration.

Slowing down is Slowing down is negative negative acceleration.acceleration.

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

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

Friction also exists Friction also exists between an object between an object rolling across another rolling across another surface.surface.

Newton’s First Law of Newton’s First Law of MotionMotion

An object at rest tends to An object at rest tends to stay at rest and an object in stay at rest and an object in motion tends to stay in motion tends to stay in motion at the same speed motion at the same speed and in the same direction and in the same direction unless acted upon by an unless acted upon by an unbalanced force.unbalanced force.

Newton’s Second Law of Newton’s Second Law of MotionMotion

Moving objects move in the Moving objects move in the direction the force is direction the force is applied.applied.

Newton’s Third Law of Newton’s Third Law of MotionMotion

For every action there is an For every action there is an equal & opposite reaction.equal & opposite reaction.

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