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

Something will keep going until something stops it.

(used google)

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Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Pushing something

(used google)

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Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.

when one body pushes against another, the second body pushes back just as hard.

(used google)

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

like pushing a car would be hard. the tires and the road would resist against each other.

(used google)

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

going fast

(used google)

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the speed of something in a given direction.

rapidly of motion or operation

(used google)

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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.

it will stay in place unless someone moves it.

(used google

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the force that attracts a body toward the center of the earth, or toward 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.

sticks to the ground or in orbit.

(used google)

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a coherent, typically large body of matter with no definite shape.

heavy

(used google)

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an influence tending to change the motion of a body or produce motion or stress in a stationary body. The magnitude of such an influence is often calculated by multiplying the mass of the body by its acceleration.

Using power

(used google)

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the action or process of moving or being moved.

a gesture