Force and Motion
Motion needs a Force-You need a force to move something. Pushing, Pulling, and Lifting...All Forces
-Forces come from people, machines, animals, nature, and others. -You pull a rope during tug-of-war (A force causing a motion) -Nature pushes tree leaves when the wind blows (A force causing motion) -A squirrel will pick up a walnut, lifting the nut off the ground. (A force causing a motion) -An engine can push a rocket into the air (A force causing a motion) Newton's 3 Laws of MotionNewton's 1st Law of Motion: An object at rest will not move unless a force acts upon it. An object that is moving will keep moving unless a force stops it.
***If a ball is sitting still on the ground, it will remain there until someone kicks it. If the ball is rolling, it will keep rolling until it hits the grass or something stops it.*** Newton's 2nd Law of Motion: An object's motion depends on how much mass it has and how much force is needed to move it. ***It is harder to move a heavy boulder than it is to move pebbles*** Newton's 3rd Law of Motion: Every force or action has an opposite or equal reaction. ***If you pick up a heavy box, mass and gravity keep pulling it back down*** Isaac Newton
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Types of ForceGravity
-Greater masses have a stronger pull that smaller masses. If they are close, the pull is stronger. -Earth's gravity keeps you on the ground. -The sun's gravity keeps Earth Friction -Friction slows down moving things and also heats them up -Sliding Friction: When two things rub together, the objects are slowed down and heat is also created. ***Rubbing your hands together*** Rolling Friction: When an object is rolling, the object will slow down. ***A rolling bowling ball*** Fluid Friction: An object slows down when moving through liquid or air. ***Your finger slows down more moving through honey than water.*** Magnetism Magnetism: Pulls and pushes objects made of certain metals. Magnets also push and pull each other. Magnetic Field: The force of magnetism can move a force without touching it. There is an invisible magnetic field that causes a magnet to pull or push another magnet or object. If the magnet or object gets out of that field, there will be no push or pull. Poles: Magnets have a north pole and south pole. Opposite poles attract (pull together), while like poles repel (push away). Electromagnetism: When magnets spin past wires, electricity is created. ***Maglev train*** - |
Force, Motion, and WorkWork: Work happens when you move something. It takes more work to move something heavy. It takes more work to move something farther away.
EnergyEnergy is the ability to do work.
Potential Energy: Energy that is stored and ready to use. Kinetic Energy: Energy in motion. Examples: Rubberband- Pulling back a rubberband before you let it go is potential energy. When you let the rubberband go, it is now moving and using the energy. This is Kinetic energy. Food: When you eat food, you are storing up energy. This is potential energy. When you move, you are using the energy and the energy is now kinetic. Car: A car that has gas in it, but is sitting in the garage, it has potential energy. When the car starts and moves, it has kinetic energy. Energy Transfer: Changing and moving energy. Energy can be changed from one kind to another. Energy can be moved from one place to another. ***Energy stored when you eat food gives your muscles energy to move your arms. Your arms then use a drumstick to play drums, which causes a drum to vibrate and make sound. The energy went from your body to the drum, |
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Careers in Force and MotionAutomobile Engineer
Space Exploration/Astronaut Factory Worker Construction Pilot Roller Coaster Engineer Military Department of Transportation Many, many more! |
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