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Transcript
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 WarmUp Scivid Lottery(20 dollar give away) Staple Posters Gravity Poster Mythbusters: Bullet Motion Physical Science Lottery #3 Gravity Poster Gravity Side +10 Projectile Motion side +10 ________/__20 pts_ Newtons 2nd Law Poster Left Side: Notes +10 Right: Math +10 Newtons 3rd Law and Momentum Poster Third Law side +10 Momentum side +10 ____ /__20_ Back Side Car Crash Lesson Data Table Force Plate Jump Game ______/__40 pts__ ____ /__30_ Newton’s First Law Inertia Notes on the Left side +10 _____/ 20 pts Car Crash Physic Movie Facts _____/10 pts Newton’s 3 Laws Newton’s First Law Vocab: Net Force Force: Push or pull 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 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 Orbit 2.Flying off a bike 3.Stuff flying off dash Mass and Inertia Newtons 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. As the MASS of an object increases so does its INERTIA List Five objects with a lot of INERTIA: Ping pong ball continued in its forward motion, can wanted to keep its rest, ping pong ball won. Egg Spin 1. Liquidy egg is not effected when you touch the shell so the egg is harder to start and harder to stop Newton’s Second Law Newton’s Second Law Description Newton’s Second Law Math 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 Simple Rules: 1. The greater the force that is applied to an object the greater Acceleration it will have F= ma THE HARDER YOU PUSH THE MORE SOMETHING SPEEDS UP, SLOWS DOWN, OR CHANGES 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 Draw a situation that describes the two rules Friction Friction: This is the force that always opposes motion. F = 1000 x 2= = 2000 N 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 F=ma A= F/m M=F/a A= F/M A= 2000 N/ 2 kg Three Types of Friction Static Friction: Friction between two surfaces that are not moving Rolling Friction: Friction between rolling object and a flat surface(least amount of friction Sliding Friction: Friction between flat surfaces where there is some movement but force must be constantly applied = 1000 m/s/s Gravity Gravity: A force of attraction between two objects Mass Weight: The effect of gravity on an object Weight = Mass x gravity Big objects attract little objects Time Speed (m/s) to them: The average skydiver hits his terminal velocity at a speed of 56 m/s Terminal velocity: highest velocity a falling object can reach due to force air resistance = force gravity When an object is in free fall it is no longer accelerating Acceleration Distance covered 1s 10 10 10 2s 20 10 30 30 10 60 4s 40 10 100 5s 50 10 150 6s 56 10 206 3s 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? Strength of Gravity is determined by Mass and distance There is no air resistance on the moon! Belongs to an object( always the same) Weight Changes depending on the planet or moon Projectile Motion 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 Car Crash Lesson Data Table Groups Impact Force w/o barrier Impact Force With barrier Change in Force FORCE PLATE JUMP GAME Person Mass (kg) Initial Force Mass= Weight/ 9.8 This is also the weight Final Force(Final F –Initial F) Jumping Force Jumping Acceleration (m/s/s) A= Force/Mass Mass x gravity