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Lecture

Gavity and Motion.odt

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Department
Astronomy
Course
ASTR 1P01
Professor
Bozidar Mitrovic
Semester
Fall

Description
GRAVITYAND MOTION: NEWTON'S LAWS OF MOTION: • Force causes change in something’s velocity (acceleration) • Force is what causes of changes motion. • Acceleration happens when there is a net force on an object; no acceleration happens when the forces are balanced. • Aunbalanced force changes the velocity of an object FIRST LAW OF MOTION “LAW OF INERTIA” “An object at rest will remain at rest unless acted on by an unbalanced force.An object in motion continues with the same speed and in the same direction unless acted upon by an unbalanced force” SECOND LAW OF MOTION • “Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object)” • Heavier objects require more force to move the same distance as lighter objects. • F = MA • Force = Mass x Acceleration THIRD LAW OF MOTION “For every action there is an equal opposite re-action” Velocity is the generalization of speed to include direction An acceleration is a change in the speed and/or direction of motion in a given amount of time: acceleration= (the velocity change)/(the time interval of the change). • Issac Newton: He discovered the Laws of Motion and the Law of Gravity. • Laws of Motion: To change the speed of an object or it's direction of motion the new force is required; in the absence of new force the object moves along a straight line with a constant speed (which could be zero). • In order to change the direction of motion of an object, you need to apply a force NEWTON'S LAW OF GRAVITY • CIRCULAR MOTION: In the case of circular motion the direction of motion is changing all the time and the force points to the centre of the circle • Newton realized that in the case of the moon revolving around
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