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Chapter 13. Forces and Motion. Gravity. Force of attraction Dependent upon the masses of each object. Mass vs Weight. Mass Amount of matter in an object Does not change in the universe Measured in N -- newtons Weight Measure of gravitational force Varies Measured in kg or pounds.
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Chapter 13 Forces and Motion
Gravity • Force of attraction • Dependent upon the masses of each object
Mass vs Weight • Mass • Amount of matter in an object • Does not change in the universe • Measured in N -- newtons • Weight • Measure of gravitational force • Varies • Measured in kg or pounds
Law of Universal Gravitation • All objects in the universe attract each other through gravitational force • Depends upon • Mass • Distance
Orbital Motion • Horizontal movement • Vertical movement
Newton’s First Law • An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.
Newton’s Second Law • The acceleration of an object depends on the mass of the object and the amount of force applied.
Newton’s Third Law • Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
Additional Terms to Know • Inertia • Terminal velocity • Free fall • Vacuum • Centripetal force