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The gravitational force is a force that attracts any objects with mass.
Gravity is an attractive force that exists between any two objects in the universe.
http://www.softschools.com

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The force that attracts a body toward the center of the earth, or toward any other physical body having mass.
The force that causes a ball you throw in the air to come down again.
http://examples.yourdictionary.com

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The resistance that one surface or object encounters when moving over another.
An example would be rubbing both hands together to create heat.
http://examples.yourdictionary.com

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Projectile motion is a form of motion in which an object or particle.
A projectile is any object that is cast, fired, flung, heaved, hurled, pitched, tossed, or thrown.
https://physics.info

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The quantity of motion of a moving body, measured as a product of its mass and velocity.
If any object of any mass is not moving, its momentum is zero because its velocity is zero.
http://www.softschools.com

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Acceleration is the increase in the rate or speed of something.
An example would be if you slow down at a red light, you are accelerating.
http://study.com

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A force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.
Whatever the object, if it moves in a circle, there is some forces acting upon it to cause it to deviate from its straight-line path, accelerate inwards and move along a circular path.
http://www.physicsclassroom.com

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Air resistance is the frictional force air exerts against a moving object.
The faster the object's motion, the greater the air resistance exerted against it.
http://kids.britannica.com

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The rate at which someone or something is able to move or operate.
An example of speed is someone cleaning a room in 10 minutes.
http://www.yourdictionary.com