ASTR 1210 Lecture Notes - Lecture 10: Sodium Hydride
27 Aug 2016
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Speed is a measure of the distance, x, covered in an amount of time, t s=x/t. Velocity is a speed in a certain direction. Example: 65 miles per hour is a speed. Example: 65 miles per hour due north is a velocity. An acceleration is a change in velocity. In physics we do not differentiate between acceleration and deceleration. Momentum is a combination of mass and velocity. A force is anything that changes the momentum of an object. The unit of force is the newton. If my mass is 100 kg, the force of gravity on the surface of the earth that is pulling on me (and the force that my feet exert on the earth) is 980 n. An acceleration is a change in the velocity of an object. On the surface of the earth, the acceleration due to gravity is 9. 8 m/s2 (32 ft/s2).
