9 terms

# Force and Motion, Friction, Gravity & Newton's 3 Laws of Motion

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Force and Motion
Describe everyday things that are happening all the time. eg. pick up a pencil, turn a page, raise your hand......and so on.
Motion
means moving something from one place to another. eg. force used to swing a bat
Speed
is the scientific term that means the rate of motion, or how fast something travels.
Gravity
is the force that pulls everything toward the center of the Earth. The Earth's gravity causes everything on Earth to have weight.
Physics
In the science of physics the words Force, Motion, Speed, Gravity and Weight all have special meanings in Physics.
Friction
Is the force that happens when two things rub together.
Newton's 1st Law of Motion
An object moving in a straight line will continue moving ina straight line, unless acted on by an outside force. Also, an object at rest will stay at rest. The word for this is inertia.
Newton's 2nd Law of Motion
Force will cause a change in the otion of an object. The change in motion depends on the smount of force and the mass of the objec. There is a formula for this F = ma (Force = Mass X Acceleration.
Newton's 3rd Law of Motion
For each action, ther is an equal and opposite reaction.