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### 21 Cards in this Set

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• Back
 How can you tell if an object is in motion? If its distance from another object is changing. What is the SI unit of length? Meter What is the difference between instantaneous speed and average speed? The average speed is the overall rate of speed an object moves at and instantaneous speed is the rate at which an object moves at a given instant in time. What 3 things does acceleration refer to in science? Increasing speed, decreasing speed, and changing direction. What SI unit is force measured in? Newton What two factors does the strength of the force of friction depend on? How hard the surfaces push together and the types of surfaces involved. What are the four types of friction? Static, sliding, rolling, and fluid. What two factors affect the gravitational attraction between two objects? Mass and distance. When is an object considered in free fall? When the only force acting on it is gravity. What does Newton's first law state? An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity unless acted upon by an unbalanced force. What does Newton's second law state? Acceleration depends on the object's mass and on the net force acting on the object. What does Newton's third law of motion state? If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object. What does a centripetal force cause an object to do? Move in a circular path? Why don't satellites fall down to Earth? Because Earth is curved. When is work done on an object? When the object moves in the same direction in which the force is exerted. By changing which 3 factors does a machine make work easier? The amount of force you exert, the distance over which you exert your force, and the direction in which you exert your force. What are the 6 basic kinds of simple machines? Inclined plane, wheel and axle, wedge, screw, pulley, and lever. Where is the fulcrum in relation to the output force in a first-class lever? The fulcrum is closer to the output force. Where is the fulcrum in relation to the input force in a second-class lever? The fulcrum is farther away from the input force. Where is the fulcrum in a third-class lever? The fulcrum is wherever you put your hand. Does a fixed pulley or a movable pulley have a higher mechanical advantage? Movable pulley.