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35 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is the velocity of an object? |
The rate of change of its displacement |
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What is the equation for the velocity of an object? |
V (ms-1) = displacement (m) / time (s) |
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What is displacement? |
The distance moved by any particle from its rest position |
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What is the symbol used for displacement? |
S |
Often confused with speed |
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What is the symbol for initial velocity |
U |
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What is the symbol for final velocity? |
V |
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When an object is at rest then it's velocity is |
Zero |
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Define scalar quantity |
Has magnitude |
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Define scalar quantity |
Has magnitude |
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Example of a scalar quantity |
Speed, distance, area, volume and time |
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Define scalar quantity |
Has magnitude |
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Example of a scalar quantity |
Speed, distance, area, volume and time |
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Define vector velocity |
Has magnitude and direction |
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Define scalar quantity |
Has magnitude |
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Example of a scalar quantity |
Speed, distance, area, volume and time |
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Define vector velocity |
Has magnitude and direction |
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Examples of vector quantities |
Acceleration, displacement, velocity and force |
Easy to spot a vector quantity because it is derived from another quantity multiplied or divided by a scalar quantity |
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Work out vertical component of a force |
Fsin(angle) |
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Work out the horizontal component of a force |
FCos(angle) |
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Define acceleration |
Acceleration = the change in velocity/ time |
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Define acceleration |
Acceleration = the rate of change of velocity Measured in ms-2 |
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General Equation for acceleration |
A = change in v / change in time |
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What is instantaneous speed? |
Small distance travelled / small interval of time |
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In a displacement against time graph, what is the gradient? |
Velocity |
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In a velocity against time graph what is the gradient? |
Acceleration |
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In a velocity against time graph what is the gradient? |
Acceleration |
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In a velocity/ time graph, what is the area under the graph? |
Displacement |
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What does a positive gradient indicate? |
The object is speeding up |
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What does a positive gradient indicate? |
The object is speeding up |
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When an object is slowing down on a velocity time graph, what is the gradient? |
Negative gradient |
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What does a positive gradient indicate? |
The object is speeding up |
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When an object is slowing down on a velocity time graph, what is the gradient? |
Negative gradient |
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What are the 5 equations of motion? (suvat) |
v = u + at s = ut + 1/2at^2 s =1/2(u+v)t v^2 = u^2 + 2as u^2 = v^2 - 2as |
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What did Galileo say? |
The speed of the falling object increases at a steady rate and all objects, irrespective of their mass, have the same acceleration of free fall |
All objects have 9.81ms2 acceleration |
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In projectiles, what assumptions are made? |
Vertical component - downward acceleration = g - of velocity changes because of g Horizontal component - of velocity remains constant |
Split into two components - horizontal and vertical |
