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Work is displacement of an object due to force. First, the object must move over some distance in order for work to be done. Second, the force and the distance of movement must be in the same direction. And finally, the force must be constant. As I am lifting this book upwards, the book is moving some distance and in the same direction as I am lifting it. Thus, work is being done.

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When a force acts on an object for a short amount of time, impulse is the measure of how much the force changes the momentum of an object. When I roll a car towards the wall, the wall acts as an impulse which results in the car stopping from collision with the wall.

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If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion, which is negative acceleration. When I roll this ball, the ball is demonstrating negative acceleration, because it is slowing down due to the frictional force from the opposing side of motion.

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When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this fan has a positive acceleration. When the fan starts up from rest, the fan accelerates.

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An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. These box of tissues will stay at rest unless an unbalanced force acts upon it.

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A free falling object is an object that is falling under the sole influence of gravity. When I drop this ball, the ball is traveling 9.8 m/s^2.

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Simple harmonic motion is a type of periodic motion or oscillation motion where the restoring force is directly proportional to the displacement and acts in the direction opposite to that of displacement. The pendulum of this clock is an example.

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Centripetal acceleration is the rate of change of tangential velocity. Our moon moves in a circle so its direction changes continually; that means it has an acceleration because its velocity changes. This is an example of centripetal acceleration.

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The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors. A stretched spring has high potential energy. When released, kinetic energy will be released.

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Energy that a body possesses by virtue of being in motion. When a car is moving, it is possessing high kinetic energy, as it has a great mass and potential to go to great speeds.