Newton’s Laws of Motion

Sir Isaac Newton

Born Jan. 4, 1643 in England.

As a young student, Newton didn’t do well in school.

He worked hard and continued his education.

Later in life, Newton contributed ideas that became law in the worlds of science and math.

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 with the same speed and in the same direction unless acted upon an outside force.”

A ball will stay in place until a A ball will stay in place until a force causes it to move . . . force causes it to move . . .

Picked up Picked up Kicked Kicked Gravity causes it to roll Gravity causes it to roll

downhilldownhill

Newton’s Second Law of Motion

Force = mass X accelerationForce = mass X accelerationOr Or F Facceleration = forceacceleration = force m a m a massmass

Force is measured in Newtons (N)Force is measured in Newtons (N)Mass is measured in Kilograms (Kg)Mass is measured in Kilograms (Kg)Acceleration is measured in meters per Acceleration is measured in meters per

second squared (m/s2)second squared (m/s2) GRAVITY HAS AN ACCELERATION OF 9.8 m/s2 GRAVITY HAS AN ACCELERATION OF 9.8 m/s2

For example…

The acceleration (change of speed The acceleration (change of speed or direction) of a truck will be less or direction) of a truck will be less than the acceleration of a golf ball than the acceleration of a golf ball if the same force is applied.if the same force is applied.

If YOU push on a golf ball it will If YOU push on a golf ball it will move the truck wonmove the truck won’’t move.t move.

Newton’s Third Law of Motion

"For every action, there is an equal and opposite reaction."

Forces ALWAYS act in pairs When releasing a balloon, the force of the air leaving the

back of the balloon will cause the balloon to move forward.

ReactionAction

Balanced / Unbalanced ForcesBalanced / Unbalanced Forces

Balanced Forces - When combined Balanced Forces - When combined forces exerted on an object add up to forces exerted on an object add up to zero. (There is not a change in zero. (There is not a change in motion, so the object stays at rest.)motion, so the object stays at rest.)

Unbalanced forces - occur when you Unbalanced forces - occur when you have more force on one side than the have more force on one side than the other.other.