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What happens if you coast down a long hill without pedaling?Acceleration What happens if you coast down a long hill without pedaling?
At the top of the hill you move…Acceleration At the top of the hill you move…
As you go down the hill, your speed…Acceleration As you go down the hill, your speed…
Gets faster and faster! You…Acceleration Gets faster and faster! You…
Acceleration Acceleration is the rate of change in the speed of an object. Rate of change means the ratio of the amount of change divided by how much time the change takes.
“The Mazda Miata can go from 0 to 60 in 10 seconds!”Acceleration “The Mazda Miata can go from 0 to 60 in 10 seconds!” What does that mean?
Acceleration The car’s speed starts at 0 and reaches 60 mph in 10 seconds. What is the car’s acceleration?
a = ? Vf= 60m/hr Vi= 0 m/hr t = 10 secAcceleration a = ? Vf= 60m/hr Vi= 0 m/hr t = 10 sec
This means that the car’s speed is increasing 6 mph each second!Acceleration This means that the car’s speed is increasing 6 mph each second!
Acceleration If you were driving and a dog ran in front of your car what would you do?
Acceleration If you slammed on your brakes and came to a stop to avoid hitting the dog, did you accelerate?
Acceleration Yes, yes you did.
Acceleration In physics, accelerate refers to any change in speed, (+) or (-), though the word decelerate is used sometimes to describe motion that is slowing down
Acceleration Acceleration is: speeding up (accelerating)slowing down (negative acceleration or decelerating) turning (changing direction)
The acceleration of an object can be in the same direction as its velocity or in the opposite direction. Velocity increases when acceleration is in the same direction.
Acceleration Units for Acceleration Most often m/s2 Ex: 10 m/s2this means the speed is increasing by 10 m/s every second
What are some examples of Acceleration?
Is it possible to be moving and have zero acceleration?
Yes! An object has zero acceleration if it is traveling at constant speed in one direction. Ex: cruise control in a car
An object moving with constant acceleration has a velocity that changes by the same amount every second Constant acceleration is sometimes called uniform acceleration in physics problems.
An object can have acceleration but no speed.
A plane starts at rest and ends up going 200 m/s in 10 secsA plane starts at rest and ends up going 200 m/s in 10 secs. Calculate acceleration.
A race car starts at 400 m/s and then stops in 20 secondsA race car starts at 400 m/s and then stops in 20 seconds. Calculate the car’s acceleration.
Notes: 11.3 Acceleration.
Objectives: 1.Be able to distinguish between distance and displacement 2.Explain the difference between speed and velocity 3.Be able to interpret motion.
Opening Activity Compare and contrast the following:
When you are in motion, you are constantly adjusting your velocity and direction to match what is happening around you. Changing velocity is called.
9.1: Acceleration is the rate of change in velocity FRIDAY APRIL 25th APRIL (c) McGraw Hill Ryerson 2007.
L l Kingda Ka Coaster: 0 – 128 mph in 3.5 seconds through hydraulic system & compressed air. Jennifer.
Lab 4 – Accelerated Motion Lab
Define velocity Give an example ( If you have not done so – hand in your lab)
Kinematics- Acceleration Chapter 5 (pg ) A Mathematical Model of Motion.
Motion Notes Speed, Velocity, and Acceleration!. Motion A change in position, over time, relative to a reference point.
Acceleration Definition 2 ways to do it Positive acceleration Negative acceleration (deceleration) A change in velocity Change speed and/or Change direction.
Which line represents the greater speed? Graphing motion The greater the speed, the steeper the slope.
Acceleration The rate at which velocity changes. Acceleration Acceleration can be described as changes in speed, changes in direction, or changes in both.
Acceleration When an object is changing its velocity, we say that the object has acceleration Acceleration is how fast velocity is changing To accelerate,
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