To say something is truly moving, you have to observe how it changes relative to a reference point.
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Transcript of To say something is truly moving, you have to observe how it changes relative to a reference point.
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MOTION
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To say something is truly moving, you have to observe how it changes relative to a reference point.
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How far an object travels will be measured in
meters.
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The actual path an object travels
The object may turn and curve.
DISTANCE
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Straight line path from start to finish, shortest distance.Tells how far and gives a direction.Measures the change in an object’s position.
DISPLACEMENT
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4 Meters
3 Meters
5 Meters
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DISTANCE DISPLACEMENT
DIRECTION
STAIGHT LINE
METERSLENGTH OFACTUAL PATH
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The speed of an object can be determined if we know
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The distance an object travels
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And the time it takes to go this distance.
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If I identify the direction in which that object travels, I am now taking about its velocity.
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3 m/s __________________
3 m/s due North __________________
5.6 m/s __________________
5.6 m/s out the door______________
speed_
velocity
speed
velocity
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To calculate how fast an object is moving we need to measureDistance (D) in metersTime (T) in seconds
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Velocity = Distance
TimeV = D
T
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A wheelchair racer finishes a 132 m race in 18s. What is his speed?K11. Rewrite formulaK22. Put in knownsUk3. Do mathFormula4. Write answer
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Find the velocity of a swimmer who swims 110 m toward the shore in 72 seconds.K1 1.K2 2.UK 3.Formula 4.
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Find the velocity of a baseball thrown 38 m from third base to first base in 1.7s.
K1 1.K2 2.UK 3.Formula 4.
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Distance (D)
Velocity (V)
Time (T)
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If a cheetah can run at a maximum velocity of 29m/s towards its prey for 28 seconds, how far does it run?
K1 1.K2 2.UK 3.Formula 4.
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If you can run at a rate of 12 m/s, how far would you go in 3 seconds?
K1 1.K2 2.UK 3.Formula 4.
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A crow covers a distance of 120 m in 8 seconds. How fast does it fly?
K1 1.K2 2.UK 3.Formula 4.
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How far can a matchbox car travel in 8 seconds, if it travels at a speed of 2 m/s?
K1 1.K2 2.UK 3.Formula 4.
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Acceleration
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Acceleration refers to a change in one of two things…
Speed, or how fast you are moving.
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Direction in which you are moving.
Centripetal accelerationOccurs during circular motion.
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Time (T) seconds, for which the object travels.Initial Velocity (Vi), or starting velocity of an objectFinal Velocity (Vf), or the ending velocity of the object.
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We will use the symbol delta(∆)to indicate the change in velocity of an the object.
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If the change in velocity is positive, we will say that the object is speeding up.
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If the change in velocity is negative, we will say that the object is slowing down.
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We find the change in velocity by subtracting the initial velocity from the final velocity.
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∆ V = Vf – Vi
CHANGE = FINAL – INITIAL
IN VELOCITY VELOCITY VELOCITY
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The unit for acceleration is meter or m/s2
second2
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Change in Acceleration =
Velocity
time
A = Vf – Vi A = ∆V
tt
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Acceleration (A)
Time (T)
Change in Velocity
(∆V)
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What is the acceleration of a car that starts at rest and gets to a speed of 29.4 m/s in 45 seconds?
K1 1.K2 2.K3 3.UK 4.Formula
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What is the acceleration of a toy travelling at a rate of 6 m/s if it comes to a stop in 2 seconds?
K1 1.K2 2.K3 3.UK 4.Formula
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What is the acceleration of a bird who takes off from a nest and 7 seconds later is travelling at a rate of 9 m/s?
K1 1.K2 2.K3 3.UK 4.Formula
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How long will it take for a person on bike to accelerate from rest to 15 m/s if the rate of acceleration is 10 m/s2?
K1 1.K2 2.K3 3.UK 4.Formula
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