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### 42 Cards in this Set

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 What is an object's change in position relative to a reference point? motion What are some ways we describe motion? direction, distance, and speed What is an object that stays (or appears to stay) in one place? reference point What is how fast something's moving? speed How can you calculate the average speed of something? distance/time What is the SI unit for speed? meters per second What is the speed of an object in a particular direction? velocity How do you determine resultant velocity? same direction-add different direction-subtract the smaller number from the larger What is the rate at which velocity changes? acceleration When does acceleration occur? When there's a change in speed, direction, or both When is acceleration positive and when is it negative? positive-increase in velocity negative-decrease in velocity How can you calculate average acceleration? final velocity-starting velocity/time it takes to change velocity How is it possible to be accelerating and traveling at a constant speed? if you change direction What is the acceleration that occurs in a circular motion? centripetal acceleration What is the push or pull on an object? force What can forces cause to happen to an object? changes in motion (stop, slow down, speed up) What is the unit used to measure force? Newtons (N) What is the combonation of all forces acting on an object? net force How do you calculate net force? same direction-add differenct direction-subtract the smaller from the larger What is it when objects are in control? mechanical force What is it when objects do not need to be in contact? field force Describe a balanced force. -net 0 N -won't cause a change in motion Describe an unbalanced force. -net force isn't 0 N -a change in motion Give some examples of balanced and unbalanced forces. balanced-light hanging on cieling, book on desk, bird's nest in a tree unbalanced-soccer ball after kicked, teeter-totter in motion What is the force that opposes motion between surfaces that are in contact? friction What is the force that opposes motion between surfaces that are in contact? friction The amount of friction depends on what factors? -roughness of surfaces -amount of force pushing object together -mass of objects (surface area) What kind of an effect can friction have on an object in motion? -slow down or stop motion -build up heat What is the friction between moving surfaces? kinetic friction What is the friction between objects that balances any opposing force so object does not move? static friction What are some ways friction is helpful? -help you walk -write with pen or pencil -keep car on road What are some ways friction is harmful? -wear holes in clothes -erodes soil -wears out machine parts What are some ways you can reduce friction? -smoothing surfaces -using lubricants -change sliding friction to rolling what are some ways you can increase friction? -rougher surfaces -increase forces on surface What is the force of attraction between objects due to their masses? gravity What is the measure of the gravitational force of an object? weight What is the measure of the amount of matter in an object? mass How is mass and weight different? weight can change from place to place, but mass doesn't What is it that states all objects in universe attract eachother through gravitational force? Law of Universal Gravitation What factors affect the amount of Gravitational force? 1.mass of object 2.distance between objects Why would your weight change, not your mass if you landed on another planet? mass never changes; you never get smaller or bigger, but gravity would be different, so your weight would too What is the measure of gravitational force? weight