Newton’s Newton’s Laws of Laws of MotionMotion

I.I. Law of Inertia Law of Inertia

II.II. F=ma F=ma

III.III. Action-Reaction Action-Reaction

Newton’s Laws of MotionNewton’s Laws of Motion

11stst Law Law – Inertia– Inertia 22ndnd Law Law – – F=maF=ma 33rdrd Law Law – – Action-ReactionAction-Reaction

11stst Law of Motion Law of Motion (Law of Inertia) (Law of Inertia)

An object at rest will stay An object at rest will stay at rest, and an object in at rest, and an object in motion will stay in motion motion will stay in motion at constant velocity, at constant velocity, unless acted upon by an unless acted upon by an unbalanced force.unbalanced force.

11stst Law Law Inertia is the Inertia is the

tendency of an tendency of an object to resist object to resist changes in its changes in its velocity: velocity: whether in whether in motion or motion or motionless.motionless.

These pumpkins will not move unless acted on by an unbalanced force.

ForceForce

A push or pullA push or pull

Forces At RestForces At Rest There are forces acting on the There are forces acting on the

egg.egg. Gravity is pulling the egg downGravity is pulling the egg down A force called the normal force is A force called the normal force is

keeping the egg from fallingkeeping the egg from falling The forces are balanced so The forces are balanced so

there is no change in motion. there is no change in motion. This egg will stay there forever This egg will stay there forever

unless a unbalanced force acts unless a unbalanced force acts on it.on it.

It might get stinky after a It might get stinky after a while!while!

Throwing the eggThrowing the egg

The force of your The force of your hand pushing the hand pushing the egg as you throw it egg as you throw it is unbalanced. is unbalanced.

Unbalanced means Unbalanced means there is no force there is no force countering it. countering it.

The result of the The result of the unbalanced force is unbalanced force is a change in motiona change in motion

Forces in MotionForces in Motion Once the egg is in flight, it would never stop.Once the egg is in flight, it would never stop. The unbalanced forces that affect its motion The unbalanced forces that affect its motion

while in flight.while in flight. GravityGravity Air Resistance Air Resistance

(Friction)(Friction)

Catching the EggCatching the Egg

When the egg is When the egg is caught, the unbalanced caught, the unbalanced force of your hands force of your hands changes the motion of changes the motion of the egg. the egg.

Inertia of the yolkInertia of the yolk

The force of your hands The force of your hands stops the shell. stops the shell.

The yolk inside the egg The yolk inside the egg is stopped by the shell. is stopped by the shell.

If the force of your hand If the force of your hand breaks the shell, breaks the shell,

The inertia of the yolk The inertia of the yolk will cause it to continue will cause it to continue moving. moving.

Egg TossEgg Toss

Every year in July, there is a National Egg Every year in July, there is a National Egg Toss Competition in Hagerstown, Maryland.Toss Competition in Hagerstown, Maryland.

2005 Champions threw the egg 63 ft. 2 in.2005 Champions threw the egg 63 ft. 2 in. According to the Guinness Book of World According to the Guinness Book of World

Records, on November 12, 1978 a Johnny Dell Records, on November 12, 1978 a Johnny Dell Foley successfully tossed a fresh hen's egg for Foley successfully tossed a fresh hen's egg for a distance of 323 ft 2in (98.51m) to a Keith a distance of 323 ft 2in (98.51m) to a Keith Thomas at Jewett, Texas. Thomas at Jewett, Texas.

There are four main types of friction:There are four main types of friction: Sliding friction: Sliding friction: ice skating Rolling friction: Rolling friction: bowling Fluid friction (air or liquid): Fluid friction (air or liquid): air or water resistance Static friction: Static friction: initial friction when moving an object

Newtons’s 1Newtons’s 1stst Law and You Law and You

Don’t let this be you. Wear seat belts.Don’t let this be you. Wear seat belts.

Because of inertia, objects (including you) Because of inertia, objects (including you) resist changes in their motion. When the resist changes in their motion. When the car going 80 km/hour is stopped by the car going 80 km/hour is stopped by the brick wall, your body keeps moving at 80 brick wall, your body keeps moving at 80 m/hour.m/hour.