### Forces & Motion

 Supporting files for this material can be found here.Force - Any push or pull on an object.Any force has an agent (the person or thing generating the force) and a receiver (the person or thing that is having the force done to them).  For example, if Mr. Baker throws a ball, then Mr. Baker is the agent because he is putting a force on the ball (the receiver).Forces have the ability to...   - make objects move or stop moving,   - change an object's speed or direction,   - change an object's shape.Newton's Laws of MotionNewton's 1st Law - Inertia   An object in motion/at rest will stay in motion/at rest until acted   on by an outside force.   inertia: a resistance to change in motion. Newton's 2nd Law   The change in motion of an object depends on the amount and   the direction of the force put on that object.   Force = Mass x Acceleration   acceleration: change in velocity/speed. Newton's 3rd Law   For every action, there is an equal and opposite reaction.*Note: On Earth, Newton's Laws are influenced by gravity and friction.  For best results, test these Laws in outer space.*Forces are measured in Newtons (N).  It takes 1N of force to pick up a mass of 100g.Friction is a force that resists movement.Forces tend to occur in pairs.  For example, if I am sitting in a chair, gravity is pulling me down while the chair is holding me up.  This shows a downward  force (gravity) and an upward force (the strength of the chair).  If these forces are balanced, then I will stay where I am.  However, if the gravity were to suddenly become stronger than the chair, then the chair would break and I would be pulled down.  On the other hand, if I add to the chair's force by pushing with my legs, my body will rise and I will stand up.Mass vs. WeightMass and weight are not the same thing!  Mass is a measure of how much material is packed into an object.  Weight is a measure of how much pull gravity is exerting on an object.  Mass is measured in grams and kilograms.  Weight is measured in ounces and pounds.Resources(Playlist) - A series of video lessons about Physics. Frames of Reference  (27:25)Feather & Hammer Drop on the Moon (0:47)  An experiment by the Apollo 15 astronauts.Supporting files for this material can be found here.
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