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30 Cards in this Set
- Front
- Back
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gravity
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The force that pulls all objects toward the center of the earth.
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push
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The force that moves something away from you.
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pull
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The force that moves something towards you.
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friction
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The rubbing force of one object against another. It causes moving objects to slow down.
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force
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An energy that causes motion or a change in motion.
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lever
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A bar that moves on a fixed point, like a balance. It is a simple machine that makes work easier.
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inclined plane
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A sloping surface used to move heavy loads up or down, like a ramp It is a simple machine that makes work easier.
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pulley
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A machine with wheels and a rope to move objects up, down, and across a long distance. It is a simple machine that makes work easier.
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wedge
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A type of inclined plane with two inclined planes working together. Wide at one end tapering to a point at the other end. It is a simple machine that makes work easier.
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wheel and axle
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Moves objects across a distance It is a wheel that turns the axle. The axle is fastened to the wheel so they turn together. It is a simple machine that makes work easier.
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screw
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A special type of inclined plane. This inclined plane curves around a pole. It can be used to raise and lower things and to hold things together. It is a simple machine that makes work easier.
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unbalanced forces
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Cause changes in motion.
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balanced forces
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Do not cause change in motion.
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Newton's 1st Law of Motion
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Sometimes referred to as the Law of Inertia. An object will not change its motion unless a force acts upon the object.
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Newton's 2nd Law of Motion
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A net force acting on an object changes the velocity of the object, causing acceleration. The acceleration depends on the mass of the object. More massive objects need fore force to change motion.
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Newton's 3rd Law of Motion
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Sometimes referred to as Action-Reaction. When an object exerts a force on another object, the second object exerts an equal force in the opposite direction.
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energy
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The ability to cause change or do work.
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________is done when an object is moved because a force is applied to it.
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work
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A push or a pull is called what?
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a force
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What simple machine is used for moving objects quickly and smoothly
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wheel and axle
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screw
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A special type of inclined plane. This inclined plane curves around a pole. It can be used to raise and lower things and to hold things together. It is a simple machine that makes work easier.
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unbalanced forces
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Cause changes in motion.
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balanced forces
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Do not cause change in motion.
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Newton's 1st Law of Motion
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Sometimes referred to as the Law of Inertia. An object will not change its motion unless a force acts upon the object.
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Newton's 2nd Law of Motion
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A net force acting on an object changes the velocity of the object, causing acceleration. The acceleration depends on the mass of the object. More massive objects need fore force to change motion.
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Newton's 3rd Law of Motion
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Sometimes referred to as Action-Reaction. When an object exerts a force on another object, the second object exerts an equal force in the opposite direction.
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energy
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The ability to cause change or do work.
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________is done when an object is moved because a force is applied to it.
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work
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A push or a pull is called what?
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a force
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What simple machine is used for moving objects quickly and smoothly
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wheel and axle
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