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In physics, motion is a change in position of an object over time. Motion is described in terms of displacement, distance, velocity, acceleration, time and speed.

the action or process of moving or being moved.

"the laws of planetary motion"

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a vehicle's capacity to gain speed within a short time.

"a Formula One car is superior to an Indy car in its acceleration

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The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. Newton's first law of motion is often stated as.

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.

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of motion pertains to the behavior of objects for which all existing forces are not balanced.

The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

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A force is a push or a pull that acts upon an object as a results of its interaction with another object. ... These two forces are called action and reaction forces and are the subject of Newton's third law of motion.

Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction.

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make a way through or into by physical strength; break open by force.

"they broke into Fred's house and forced every cupboard door with ax or crowbar"

synonyms: | break open, burst open, knock down, smash down, kick in"the door had to be forced"

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1. a tendency to do nothing or to remain unchanged.

1. "the bureaucratic inertia of government"

2. synonyms: | inactivity, inaction, inertness; More

3. 2.

4. PHYSICS

5. a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.                                                                                     http://www.dictionary.com/brower/inertia

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the speed of something in a given direction.

"the velocities of the emitted particles"

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the resistance that one surface or object encounters when moving over another.

"a lubrication system that reduces friction"

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Gravity means the force  that attracts  a body towards the center of the earth, or towards any other physical body having mass . For most purposes newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.

early 16th century: from French, from medieval Latin importantia, from important- ‘being of consequence,’ from the verb importare.

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A coherenet, typicall large body of matter withno definite shape

Mass is a measurement of the amount of matter something contains, while Weight is the measurement of the pull of gravity on an object. 2)

Mass is measured by using a balance comparing a known amount of matter to an unknown amount of matter.

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