Gravity.

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Gravity: A force with which to be reckoned.

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Presentation transcript:

Gravity

Gravity Force that pulls objects toward each other More mass = more gravity Why do you not attract things?

Universal Gravitation Gravity acts everywhere in the universe Law of Universal Gravitation: Force of gravity acts between all objects in the universe Any 2 objects attract each other Other gravitational forces are small compared to that of the earth

Factors That Affect Gravity 2 factors affect gravitational attracting between objects Mass: more mass = more gravity Distance: More distance = less gravity

The Sun Large Mass Keeps planets in orbit Force that changes the direction of the planet’s movement Further away, less gravity acts on them

Free Fall When the only force acting on an object is gravity, the object is said to be in free fall Therefore, in free fall, the force of gravity is an unbalanced force Acceleration do to earths gravity = 9.8m/s2

Air Resistance Upward force on falling objects More surface area = more air resistance Air resistance increases with velocity Terminal velocity: greatest velocity a falling object reaches Reached when force of air resistance equals the weight of the object