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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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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.

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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 motionwith the same speed and in the same direction unless acted upon by an unbalanced force.

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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.

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Projectile motion is a form of motion in which an object or particle (in either case referred to as a projectile) is thrown near the Earth's surface, and it moves along a curved path under the action of gravity only.

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downward movement under the force of gravity only.

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Weight
a body's relative mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing.

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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.

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1. Friction

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

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1. Velocity

the speed of something in a given direction.

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1. Motion

the action or process of moving or being moved.

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1. Acceleration

he rate of change of velocity per unit of time.

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

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1. Average Speed

Average speed can be viewed as the rate of change in distance with respect to time. A car traveling at an average speed of 25 miles per hour covers an average distance of 25 miles every hour.

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1. Path of Totality during an eclipse.

Total Solar Eclipses and the Path of Totality. If the Moon's inner or umbral shadow sweeps across Earth's surface, then a total eclipse of the Sun is seen. The track of the Moon's umbral shadow across Earth is called the Path of Totality

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Based on wind resistance, for example, the terminal velocity of a skydiver in a belly-to-earth (i.e., face down) free-fall position is about 195 km/h (122 mph or 54 m/s).

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1. Partial Eclipse

an eclipse of a celestial body in which only part of the luminary is obscured or darkened.

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A random event

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1.  moon between it and a point on the earth solar eclipse

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1. Total Eclipse

The solar eclipse of August 21, 2017 was a total eclipse visible within a band across the entire contiguous United States, passing from the Pacific to the Atlantic coasts.