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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. ... An object at rest stays at rest and an object in motionstays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

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a tendency to do nothing or to remain unchanged.

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

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

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the speed of something in a given direction.

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the action or process of moving or being moved.

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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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increase in the rate or speed of something.

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an eclipse of the sun in which the moon does not completely hide the solar surface or photosphere so that some direct rays of sunlight reach the observer : all the part of a total solar eclipse outside of the path of totality.

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1. an eclipse in which the whole of the disk of the sun or moon is obscured.

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an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination.

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Examples include: sunrise, weather, fog, thunder, tornadoes; biological processes, decomposition, germination; physical processes, wave propagation, erosion; tidal flow, and natural disasters such as electromagnetic pulses, volcanic eruptions, and earthquakes.