# Physics P2.1 : Motion

• Created by: TillyF
• Created on: 20-12-16 08:55
What does the gradient of a line on a distance time graph represent?
The gradient of a line represent speed
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What does a steeper line indicate on a distance time graph represent?
A steeper gradient represents a faster speed
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How do we calculate speed?
speed (m/s) = distance travelled (m) / time taken (s)
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What does a stationary movement look like on a distance-time graph?
A stationary movement is a horizontal line on a distance-time graph
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What is velocity?
Velocity is speed in a given direction
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Describe the velocity of an object moving in a circle?
An object moving steadily round in a circle has a constant speed, its direction of motion changes continuously as it goes round so its velocity is not constant.
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Do objects moving in different direction have the same velocity?
The velocity is different for objects moving in different directions
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What is the acceleration of an object?
The acceleration of an object is its change of velocity per second
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What is the unit for acceleration?
metre per squared second = m/s^2
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What is the equation for acceleration?
Acceleration (m/s^2) = change in velocity (m/s) (final - initial velocity) / time taken for the change (s)
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Equation for acceleration?
a = v - u / t where v = final velocity (m/s) u = the initial velocity (m/s) t = time taken (s)
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What is deceleration?
Deceleration is when an object slows down
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What does the gradient of a line on a velocity time graph represent?
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What does a horizontal line represent on a velocity time graph?
A horizontal line at a gradient of 0 represent constant velocity
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What does a negative gradient represent on a velocity time graph?
When the gradient is negative, the velocity decreases and the vehicle is decelerating.
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How can we calculate the distance travelled from a velocity time graph?
The area under the line on a velocity-time graph represents distance travelled. We calculate the area of the shape of the graph, using the values on the graph. Area of a triangle = bxhx0.5 Area of a rectangle = bxh
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What is the calculation for the gradient of a line?
gradient = the height of the triangle / the base of the triangle gradient = speed (for a distance-time graph)
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When is the line on a distance time graph not a straight line?
For a moving object with a changing speed, the distance-time graph is not a straight line.
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What does the gradient of the line on a velocity-time graph represent?
acceleration
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How do we calculate the acceleration on a velocity-time graph?
acceleration = change of velocity / time taken
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What does the gradient of a line represent on a distance time graph?
The speed of an object
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END CARD
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## Other cards in this set

### Card 2

#### Front

What does a steeper line indicate on a distance time graph represent?

#### Back

A steeper gradient represents a faster speed

### Card 3

#### Front

How do we calculate speed?

### Card 4

#### Front

What does a stationary movement look like on a distance-time graph?

### Card 5

#### Front

What is velocity?