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Published byElisabeth Johns Modified over 9 years ago
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Motion
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Speed and Velocity An object is moving if its position changes against some background that stays the same ◦Reference frame
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Speed and Velocity Speed describes how fast an object moves How do we determine speed?
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Speed and Velocity To find speed, you must measure two quantities: distance traveled and the time it takes to travel that distance
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Speed and Velocity When an object covers equal distances in equal amounts of time, it is moving at a constant speed
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Speed and Velocity The relationship between speed, distance, and time can be investigated by plotting a distance-time graph
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Speed and Velocity Most objects do not move at constant speed Average speed is the distance covered divided by the time it takes to travel that distance
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Speed and Velocity Velocity describes both speed and direction
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Speed and Velocity 1. 110m/72s=1.5 m/s toward shore
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Speed and Velocity 1. 110m/72s=1.5 m/s toward shore 2. 38m/1.7s= 22m/s toward first base
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Speed and Velocity 1. 110m/72s=1.5 m/s toward shore 2. 38m/1.7s= 22m/s toward first base 3. D=vt (12km/h)(5h)=60km(1000m/km)= 6x10 4 m
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Speed and Velocity 1. 110m/72s=1.5 m/s toward shore 2. 38m/1.7s= 22m/s toward first base 3. D=vt (12km/h)(5h)=60km(1000m/km)= 6x10 4 m 4. T=d/v (2.6km)(1000m/km)/(28m/s)=93s
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Speed and Velocity The velocity of an object changes if its speed or direction changes or both change
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Momentum An object with more momentum would be more difficult to stop ◦Depends on both its velocity and its mass
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Momentum For an object moving in a straight line: ◦Momentum= mass x velocity P=mv
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Momentum Momentum, like velocity, has direction ◦Momentum has same direction as velocity If an object is not moving, its momentum is zero
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Momentum 1.a. (75kg)(16m/s)=1200kg m/s forward
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Momentum b. (135kg)(16.2m/s)=2190kg m/s north
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Momentum 1.a. (75kg)(16m/s)=1200kg m/s forward b. (135kg)(16.2m/s)=2190kg m/s north c. (5kg)72m/s)=360kg m/s eastward
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Momentum 1.a. (75kg)(16m/s)=1200kg m/s forward b. (135kg)(16.2m/s)=2190kg m/s north c. (5kg)72m/s)=360kg m/s eastward d. (.8kg)(6.5m/s)=5kg m/s to the left
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Momentum 1.a. (75kg)(16m/s)=1200kg m/s forward b. (135kg)(16.2m/s)=2190kg m/s north c. (5kg)72m/s)=360kg m/s eastward d. (.8kg)(6.5m/s)=5kg m/s to the left e. (48.5kg)(0m/s)=0kg m/s
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Momentum The total amount of momentum in a system is conserved
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