motion. speed and velocity an object is moving if its position changes against some background that...
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![Page 1: Motion. Speed and Velocity An object is moving if its position changes against some background that stays the same ◦Reference frame](https://reader035.vdocuments.net/reader035/viewer/2022062804/5697bf711a28abf838c7df6e/html5/thumbnails/1.jpg)
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 shore2. 38m/1.7s= 22m/s toward first base
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Speed and Velocity
1. 110m/72s=1.5 m/s toward shore2. 38m/1.7s= 22m/s toward first base3. D=vt (12km/h)(5h)=60km(1000m/km)=
6x104 m
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Speed and Velocity
1. 110m/72s=1.5 m/s toward shore2. 38m/1.7s= 22m/s toward first base3. D=vt (12km/h)(5h)=60km(1000m/km)=
6x104 m4. 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
1.a. (75kg)(16m/s)=1200kg m/s forward 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