newton’s laws of motion. forces we have talked about different forces before but haven’t...
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Newton’s Laws of motion
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Forces
• We have talked about different forces before but haven’t examined them in depth.
• A force is a push or a pull on an object
• What are some forces that act on you?
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Contact vs. range force
• A contact force is a force exerted when it is in contact with something else
• A range force is a force exerted without making physical contact with another object
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Free body diagrams
• Free body diagrams are drawings that show all of the forces acting on a body (object)
• In your groups draw 5 free body diagrams of objects in our class.
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Free body diagram of a moving object
• As Mr. Gehlsen rolls the ball find the free body diagram of the ball.
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Free body diagrams
• What if 2 forces acted on an object in the same direction?
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Net force
• Net force is the vector sum of all forces acting on an object
• When net force is zero an object isn’t moving: this is called equilibrium
• What happens when a net force is not zero?
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Newton’s Second Law
• The vector sum of the external forces F on an object is equal to the mass m of that object multiplied by the acceleration vector a of the object: F = ma.
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Units of force
• What is the unit of force in basic units
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Newton’s First Law
• When viewed in an inertial reference frame, an object either remains at rest or continues to move at a constant velocity, unless acted upon by an external force.
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Newton’s First Law
• An object will stay at rest or continue to move unless an outside force acts on it.
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Inertia
• Inertia is the tendency for an object to resist change.
• What are some objects that resist change?