Relative Velocity 1 Relative Velocity Previously we stated
- Slides: 16
Relative Velocity 1
Relative Velocity Previously we stated that all motion is relative 2
Relative Velocity Previously we stated that all motion is relative This includes velocity 3
Relative Velocity Previously we stated that all motion is relative This includes velocity The velocity of an object is compared to a reference point. 4
Relative Velocity Previously we stated that all motion is relative This includes velocity The velocity of an object is compared to a reference point. Frequently that reference point is the observer. 5
The hobo is moving 1. 2 m/s in the boxcar. (relative to the boxcar) The outside observer see the hobo’s motion as 16. 5 m/s relative to the ground. 6
Is the person in the car standing still? 7
Relative Velocity 8
Relative Velocity • Velocity of the bowling ball is relative to the bowling alley 9
Relative Velocity • Velocity of the bowling ball is relative to the bowling alley • The bowling alley is the frame of reference 10
Relative Velocity • Velocity of the bowling ball is relative to the alley • When moving in a straight line, vector subtraction can be used to find the relative velocity of an object 11
Relative Velocity • B represents the bowling ball 12
Relative Velocity • B represents the bowling ball • A represents the bowling alley 13
Relative Velocity • B represents the bowling ball • A represents the bowling alley • Velocity of the ball is relative to the bowling alley 14
Relative Velocity • B represents the bowling ball v = 3. 0 m/s R • A represents the bowling alley v = 0. 0 m/s • The velocity of B relative to A is written as VBA = VB – VA 3. 0 m/s, R - 0. 0 m/s = 3. 0 m/s, R ball This is from the perspective of the alley 15
Relative Velocity • B represents the bowling ball v = 3. 0 m/s R • A represents the bowling alley v = 0. 0 m/s • The velocity of A relative to B is written as VAB = VA – VB 0. 0 m/s -3. 0 m/s, R = -3. 0 m/s, R ball This is from the perspective of the ball 16
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