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Force & motion notes 2013

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Force & motion notes 2013

1. 1. When an object’s distance from another object is changing. You must have a reference point in order to determine if something is in motion.
2. 2. Force or between objects. attraction two
3. 3. Gravity and Motion • The gravitational constant is 9.8 m/s². • Objects fall to Earth at the same acceleration regardless of mass.
4. 4. Measure of the force of attraction between an object and Earth. A Newton is the used to measure metric unit weight.
5. 5. Force between surfaces that resists the movement of one surface past another surface.
6. 6. Friction also exists between an object rolling across another surface.
7. 7. What affects acceleration? • Air resistance is a contributing factor to acceleration. • Air resistance is a fluid friction that opposes the motion of objects through air. • The amount of air resistance on an object depends on the size, shape, and velocity of the object. • The more surface area an object has, the more susceptible it is to air resistance.
8. 8. Acceleration continues … • As the speed of a falling object increases, the air resistance increases. • This upward force of air resistance increases until it reaches the downward force of gravity. • At this point the object stops accelerating and continues falling at a constant velocity called terminal velocity.
9. 9. Acceleration continues … • As the speed of a falling object increases, the air resistance increases. • This upward force of air resistance increases until it reaches the downward force of gravity. • At this point the object stops accelerating and continues falling at a constant velocity called terminal velocity.