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1 1D Motion Kinematic Equations

1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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Page 1: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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1D Motion 

Kinematic Equations

Page 2: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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The Kinematic Equations

Page 3: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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Page 4: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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A car's velocity changes from 6m/s to 20m/s while covering 70 meters. What is the acceleration of the car and the time it takes to do this? a=2.6 m/s2 t=5.38 s

Example 1

Page 5: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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At the instant a traffic light turns green, a car starts from rest and accelerates at 2.2 m/s2. At this same instant, a truck overtakes the car traveling at the constant speed of 9.5 m/s. How far from the traffic light will the car overtake the truck? xt=82 m

Example 2

Page 6: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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Class 1

Page 7: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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A ball is dropped from a bridge and strikes the water in 5 seconds. How fast is it moving when it strikes the water, and what is the height of the bridge (neglect air resistance)? y=122.5 m

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Page 8: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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With what speed must a ball be thrown vertically upward to rise to a maximum height of 50 meters? And, how long will it be in the air?v0=31.3 m/s ttotal=6.38 s

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Page 9: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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You are speeding on the freeway going 137 km/h. You see a police car with its radar gun pointed right at you, and you try to slow down quickly. Your car's brakes give you an deceleration of 5.2 m/s2 (a realistic number). How long will it take you to slow down to 88.5 km/hr? Is it worth even trying to slow down?

t=2.58 s

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Page 10: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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You drop a rock from rest from a bridge and note that it hits the ground below 1 seconds later. How high is the bridge?x0=4.9 m

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Page 11: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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You throw a rock straight down at 5m/s from a bridge and note that it hits the ground below 1seconds later. How high is the bridge? x0=9.9 m

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Page 12: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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You are standing on top of a building 20meters high, and throw a ball straight upward with a velocity of 5m/s. On the way down, the ball misses the building's top and falls to the ground. How long does it take to reach the ground, and how fast is the rock moving when it hits the ground? t=1.57 s v=­20.38 m/s

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Page 13: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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A box slides down an incline with uniform acceleration. It starts from rest and attains a speed of 2.7m/s in 3seconds. What is the acceleration of the block, and the distance it moves in the first 6seconds? a=0.9 m/s2 x=16.2 m

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Page 14: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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A ball is thrown upward and returns to its starting point in 4 seconds. Find its initial speed. v0=19.6 m/s

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Page 15: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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Two trains are mistakenly heading toward each other. Train #1 is going at 72km/hr and train #2 is going 144km/hr. They see each other and begin braking when they are 0.95km apart. Train brakes provide a stopping acceleration of 1m/s2. Is there are collision? CRASH!

Catchup 1

Page 16: 1D Motion Kinematic Equationsgauss.vaniercollege.qc.ca/~physics/MechanicsModules/203NYAH13… · At the instant a traffic light turns green, a car starts from rest and accelerates

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