Lottery #3

WarmUp

• The size of the gravitational force between two objects depends on their ____.– A. frictional forces– B. inertia

C. masses and the distance between them speed and direction

WarmUpScivid

Lottery(20 dollar give away)Staple PostersGravity Poster

Mythbusters: Bullet Motion

WarmUpScivid

Lottery(20 dollar give away)Staple PostersGravity Poster

Mythbusters: Bullet Motion

Physical Science Lottery #3Gravity PosterGravity Side +10Projectile Motion side +10

Newtons 2nd Law Poster

Left Side: Notes +10

Right: Math +10

Newtons 3rd Law and Momentum PosterThird Law side +10Momentum side +10

________/__20 pts_

____ /__20_

Back SideCar Crash Lesson Data Table

Force Plate Jump Game

Newton’s First LawInertia Notes on the Left side +10

_____/ 20 pts

Car Crash Physic Movie Facts _____/10 pts

______/__40 pts__

____ /__30_

Newton’s 3 Laws

Newton’s First Law

Short: Law of Inertia

Long: An object in motion stays in motion, an object at rest stays at rest unless acted on by a outside force

Vocab: Force: Push or pull

Example: While in a car you move at the speed of the car(80mph)… when the car stops you continue(80 mph) until you hit another object(windshield)

Example: While in a car you move at the speed of the car(80mph)… when the car stops you continue(80 mph) until you hit another object(windshield)

More examples: 1.Earth’s Rotation and Orbit2.Flying off a bike3.Stuff flying off dash

Newtons First Law DemosNewtons First Law Demos

Marker in a bottle experiment

1.The marker fell in the bottle because its inertia wanted it to fall straight down

Ping Pong ball cannon

1.Ping pong ball continued in its forward motion, can wanted to keep its rest, ping pong ball won.

Egg Spin1.Liquidy egg is not effected when you touch the shell so the egg is harder to start and harder to stop

Mass and Inertia

As the MASS of an object increases so does its INERTIA

List Five objects with a lot of INERTIA:

Net Force

Newton’s Second Law

Short: Force= Mass x Acceleration

Example: How much force will you need to use to push a pop machine that is 1000 kg with an acceleration of 2 meters per second per second

Example: How much force will you need to use to push a pop machine that is 1000 kg with an acceleration of 2 meters per second per secondSimple Rules:

1.The greater the force that is applied to an object the greater

Acceleration it will have

THE HARDER YOU PUSH THE MORE SOMETHING SPEEDS UP, SLOWS DOWN, OR CHANGES DIRECTION

Simple Rules:

1.The greater the force that is applied to an object the greater

Acceleration it will have

THE HARDER YOU PUSH THE MORE SOMETHING SPEEDS UP, SLOWS DOWN, OR CHANGES DIRECTION

F= ma F= ma

A= 2000 N/ 2 kgA= 2000 N/ 2 kg 1000 m/s/s1000 m/s/s

=

If we pushed a box of kleenex ( 2kg) with the same force ( 2000N) then what would our acceleration?If we pushed a box of kleenex ( 2kg) with the same force ( 2000N) then what would our acceleration?

HINT: If not solving for force, force is always on top

Newton’s Second Law Math

F=ma

A= F/m

M=F/a

2. If Force is unchanged, then the greater the Mass of an object the lower the acceleration will be

THE HEAVIER SOMETHING IS THE HARDER IT IS TO MAKE SPEED UP, SLOW DOWN, CHANGE DIRECTION

2. If Force is unchanged, then the greater the Mass of an object the lower the acceleration will be

THE HEAVIER SOMETHING IS THE HARDER IT IS TO MAKE SPEED UP, SLOW DOWN, CHANGE DIRECTION

A= F/M A= F/M =

Draw a situation that describes the two rules

Friction

Friction: This is the force that always opposes motion.

Three Types of FrictionStatic Friction: Friction between two surfaces that are not movingStatic Friction: Friction between two surfaces that are not moving

Rolling Friction: Friction between rolling object and a flat surface(least amount of frictionRolling Friction: Friction between rolling object and a flat surface(least amount of frictionSliding Friction: Friction between flat surfaces where there is some movement but force must be constantly appliedSliding Friction: Friction between flat surfaces where there is some movement but force must be constantly applied

Newton’s Second Law Description

F = 1000 x 2 F = 1000 x 2 2000 N=

GravityGravity: A force of attraction between two objectsGravity: A force of attraction between two objects

Big objects attract little objects to them:Big objects attract little objects to them: Time Speed (m/s) Acceleration Distance

covered

1 s 10 10 102 s 20 10 303 s 30 10 604 s 40 10 1005s 50 10 1506s 56 10 206

The average skydiver hits his terminal velocity at a speed of 56 m/s

The average skydiver hits his terminal velocity at a speed of 56 m/s

Terminal velocity: highest velocity a falling object can reach due toforce air resistance = force gravity

Terminal velocity: highest velocity a falling object can reach due toforce air resistance = force gravity

When an object is in free fall it is no longer accelerating

ALL OBJECTS FALL AT THE SAME SPEED TOWARDS THE EARTH BUT SOME ARE AFFECTED MORE BY AIR.

ALL OBJECTS FALL AT THE SAME SPEED TOWARDS THE EARTH BUT SOME ARE AFFECTED MORE BY AIR.

Why does a feather fall at a different speed than a hammer on earth but not on the moon?

There is no air resistance on the moon!

Projectile Motion

Weight: The effect of gravity on an objectWeight: The effect of gravity on an objectWeight = Mass x gravityWeight = Mass x gravityWeight: The effect of gravity on an objectWeight: The effect of gravity on an objectWeight = Mass x gravityWeight = Mass x gravity

Mass Weight

Belongs to an object( always the same)

Changes depending on the planet or moon

What if one object object is shot horizontally and another is dropped?What if one object object is shot horizontally and another is dropped?

The only force acting on either ball is GRAVITY so they fall at the same rate and hit the ground at the same time

The only force acting on either ball is GRAVITY so they fall at the same rate and hit the ground at the same time

Strength of Gravity is determined by Mass and distance

Car Crash Lesson Data Table

Person Mass (kg)

Mass= Weight/ 9.8

Initial Force

This is also the weight

Mass x gravity

Final Force(Final F –Initial F)

Jumping Force Jumping Acceleration(m/s/s)

A= Force/Mass

FORCE PLATE JUMP GAME