Velocity and acceleration P9.2 , P9.3 , P9.4

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Define velocity
velocity - the speed of an object in a given direction
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How is velocity calculated?
In the same way as speed, but you must also state the direction
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What happens to the velocity of an object if it moves at a constant speed in a circle?
It's velocity is continuously changing, even though it's speed is constant
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What is the acceleration of an object?
acceleration - the change in an object's velocity per second
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What is the word equation for acceleration?
acceleration = change in velocity/time taken
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What is the symbol equation for acceleration?
a = △v/t
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What is the full word equation for acceleration?
acceleration = final velocity-initial velocity/time
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What is the full symbol equation for acceleration?
a = v - u / t
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What are v and u in the full word equation for acceleration?
v - final velocity
u - initial velocity
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What is time measured in?
seconds (s)
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What is change in velocity measured in?
metres per second (m/s)
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What is acceleration measured in?
metres per second squared (m/s²)
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A cyclist is travelling at a velocity 4m/s west. Their velocity increases to 8m/s in 2 seconds. Calculate the acceleration of the cyclist.
(8-4)/2
= 4/2
= 2m/s²
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A car is travelling at a velocity 20m/s south. Its velocity decreases to 10m/s in 5 seconds. Calculate the acceleration of the car.

What would the deceleration be?
Acceleration = (10-20)/5
= -10/5
= -2m/s²

Deceleration would be 2m/s.
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How can you find the acceleration from a velocity-time graph?
The gradient of the line
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A straight horizontal line shows _______ velocity
An upward-sloping line shows an object _________
A downward-sloping line shows an object _________
A straight horizontal line shows CONSTANT velocity
An upward-sloping line shows an object ACCELERATING
A downward-sloping line shows an object DECELERATING
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How do you find the displacement (distance travelled in a specific direction) from a velocity-time graph?
The area under the line
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How do you find the displacement from a velocity-time graph with constant acceleration and deceleration?
Divide the space under the line into shapes and calculate the area of each shape and add it together
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How do you find the displacement from a velocity-time graph with inconstant acceleration and deceleration?
Count the squares underneath the line
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What happens to the acceleration of an object falling through a fluid?
It initially accelerates due to the force of gravity. Eventually the resultant force will be zero and the object will move at its terminal velocity.
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What is the acceleration of an object free falling under gravity near the earths surface?
9.8 m/s²
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Other cards in this set

Card 2

Front

How is velocity calculated?

Back

In the same way as speed, but you must also state the direction

Card 3

Front

What happens to the velocity of an object if it moves at a constant speed in a circle?

Back

Preview of the front of card 3

Card 4

Front

What is the acceleration of an object?

Back

Preview of the front of card 4

Card 5

Front

What is the word equation for acceleration?

Back

Preview of the front of card 5
View more cards

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