AST— Jan 17 Lecture + Chapter Notes

8 Pages

Astronomy & Astrophysics
Course Code
Michael Reid

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ASTForce Acceleration Gravity Tuesday January 17 201241Describing Motion Examples From Daily Life How de we describe motion y Speed is the rate at which an object is moving Velocity is speed in a certain direction Acceleration is a change in velocity meaning a change in either speed or direction Momentum is mass times velocity A force can change an objects momentum causing it to accelerate y Speed tells us how far an object will go in certain amount of timeof the object tells us both its speed and direction ie 100 kilometers per hour y Velocitydue north y The object has an acceleration if its velocity is changing in any way whether in speed or direction or both o Also applies to slowing downnegative acceleration causing velocity to decrease y The Acceleration of Gravity o Galileogravity accelerates all objects by the same amount regardless of their mass o Acceleration of a falling object is called the acceleration of gravityAcceleration of gravity is about 10 meters per second or 10 meters per second squared y Momentum and Forceis the product of its mass and velocity that is o An objects momentummomentummass X velocityto it o The only way to change an objects momentum is to apply a force ie collision between a car and a truck vs a car and a bug y Bug has very little momentum compared to a truck o Net Force or overall force acting on an object represents the combined affect of all the individual forces put together0Net Force0causes acceleration y Moving in Circles circling momentum any object that is spinning or o Angular Momentummoving along a curved path o Earth has angular momentumdue to its rotation and to its orbit around the Sun is the special type of force that can change an objects angular o Torquemomentum twisting forceHow is mass different from weight y An objects mass is the same no matter where it is located but its weight varies with the strength of gravity or other forces acting on the object An object becomes weightless when it in freefall even though its mass is unchanged y Mass is the amount of matter in your body
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