Force and motion

Newton's first law

• a fireman turns on his hose and is knocked backwards

• a soccer ball will not move until it is kicked

• an object in motion will remain in motion unless acted on by an unbalanced force.

• going up in an elevator and the blood rushed to your head when it suddenly stops

Newton's third law

• the law of acceleration

• the action/reaction principle

• for every action there is an equal and opposite reaction

• a person's body is thrown outward around a curve

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acceleration

• friction between a stationary object and the surface

• the force that opposes motion

• the sum of all the forces acting on an object

• the rate of changing velocity

Newton's second law

• the force of attraction that exists between all objects with mass

• force is mass times acceleration

• when forces on an object are pushing harder in one direction than another causing acceleration

• a push or pull

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mass

• measure of an object's inertia

• speed of something in a given direction

• force of the surface pushing back

• friction between a moving object and the surface

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inertia

• force of attraction between objects due to their masses

• the friction between a moving object and the surface

• reluctance to change

• the force of the push back of the surface

weight

• objects at rest stay at rest

• an unbalanced force

• the expression of gravity on a mass

• when the sum of the forces is zero

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the unit for force is

• pound

• Newton

• kilogram

• friction

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Newton's second law

• an equal and opposite reaction

• F=ma

• gravity

• an unbalanced force on an object causes the object to accelerate

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this opposes motion, and slows objects down

• slower speed

• acceleration

• friction

• an equal and opposite reaction