Physics: Lectures 1&2: Translational Motion and Force
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- Equations for uniformly accelerated linear motion
-
x = xo + vot + (1/2)at^2
v = vo + at
v^2 = vo^2 + 2ax
v(avg) = (1/2)(v + vo) - Distance vs Time graph (d/t)
-
-Slope is velocity
-Area under the curve is meaningless - Velocity vs Time graph (v/t)
-
-Slope is acceleration
-Area under curve is displacement - Displacement
- x = v(avg) * t
- Acceleration
- a = (v - vo)/t
- Peak height of a projectile
- vo*sin(theta) = sqrt(2gh)
- Factors that change air resistance
- Speed, surface area, shape
- Mass and Air Resistance
-
-Air resistance has less effect on a more massive object
-However, it does not CHANGE air resistance - Inertia
- The tendency of an object to remain in its present state of motion (EX: massive object will accelerate more slowly)
- Newton's Third Law forces NEVER act on the ______ _______.
- same system
- The normal force on an inclined plane is:
- mgcos(theta)
- The net force due to gravity and the normal force on an inclined plane is:
- mgsin(theta)
- Centripetal Force
-
(m*v^2)/(r)
always caused by another force (either gravity, electromagnetic, or contact forces) - T or F: Friction always opposes motion
- F: Friction always opposes relative motion. The vector points in the direction that would prevent surfaces from sliding past each other
- Force of Static Friction
- fs <= us*Fn
- Force of Kinetic Friction
- fk = uk*Fn
- Hooke's Law
- F = -k*dx