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1-25-2008 Lecture 9

1-25-2008 Lecture 9 - acceleration Forces-Forces change the...

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Sir Isaac Newton (1642-1727) - Perhaps the greatest genius of all time - Invented the reflecting telescope - Invented Calculus - Connected gravity and planetary forces – Philosophiae naturalis principia mathematica - Fooled around with a pin next to his eye to produce sensations Newton’s Laws of Motion 1. A body at rest or in motion at a constant speed along a straight line remains in that state of rest or motion unless acted upon by an outside force. (conservation of momentum) a. Friction makes it difficult to realize this on Earth. 2. The change in a body’s velocity due to an applied force is in the same direction as the force and proportional to it, but is inversely proportional to the body’s mass. F=ma 3. For every applied force, a force of equal size but opposite direction arises. Objects in Motion Speed – Rate at which an object moves, i.e. the distance traveled per unit time Velocity – an object’s speed in a certain direction, e.g. “10m/s moving east” Acceleration – A change in an object’s velocity, i.e. a change in either speed or direction is

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Unformatted text preview: acceleration Forces-Forces change the motion of objects.-Momentum – the (mass x velocity) of an object-Force – Anything that can cause a change in an object’s momentum Conservation of Momentum-Momentum = mass x velocity-Just like energy momentum is conserved – in the absence of forces. The acceleration of Gravity Universal Law of Gravitation-Between every two objects there is an attractive force, the magnitude of which is directly proportional to the mass of each object and inversely proportional to the square of the distance between the centers of the objects.-F g = G M 1 M 2 /d 2 Universal Gravitation-Your weight is a measure of the force of gravity upon you.-You will weigh different amounts on different planets or moons.-“Inertial” mass same as gravitational mass; explained later by Einstein as curvature of space due to gravity....
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1-25-2008 Lecture 9 - acceleration Forces-Forces change the...

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