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### 27 Cards in this Set

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 You can do work because you have potential _________. energy wheel and axle a simple machine made of a wheel attached to a rod inertia inertia is the tendency of a moving object to stay in motion or a resting object to stay at rest work the result of a force moving an object compound machine a machine made of two or more simple machines potential energy energy that an object has because of position chemical energy energy that comes from a chemical change What are two effects that forces can have on motion? start moving, speed up, slow down, stop, or change direction The tendency of an object to stay in motion until a force stops it is called_________. inertia How is a ball tossed in the air like a roller coaster car rolling down a track? Gravity is acting on both objects. gravity gravity is the force that pulls two objects toward one another because of their mass inclined plane is a simple machine with a flat surface and one end higher than the other When you apply the brakes on your bike, the brakes rub against the wheel and cause_______. friction A roller coaster car goes up and down because it is moved by a force. simple machine a machine of one or two parts The force of------is what pulls a roller coaster car to the earth. gravity Force force is a push or pull on an object that can cause it to change motion mechanical energy the kind of energy an object has because it can move or is moving screw a simple machine consisting of an inclined plane wrapped around a rod Describe how friction affects the motion of an object. Friction rubs - this rubbing changes the energy level- this will cause the object to slow down or stop. energy the ability to do work complex machine a machine made of many simple and compound machines pulley a simple machine that uses a rope and a wheel friction a force that slows the motion of moving objects kinetic energy is the energy of motion electrical energy energy that comes from the flow of electricity wedge a simple machine that has slanted sides