False. Distance is a scalar quantity because it doesn't invlove direction.
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True or false, displacement is a vector quantity?
True. Displacement is a vector quantity because it measures the distance and direction.
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You walk 5m North, then 5m South. What is your displacement and distance?
Displacement = 0m Distance travelled = 10m
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Speed and velocity both measure what?
Speed and velocity both measure how fast you're going.
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What is the difference between speed and velocity?
Speed is just how fast you are going and velocity is speed given in a direction.
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What is the equation for dsitance travelled (m)?
distance travelled (m) = (average) speed (m/s) X time (s) OR distance = speed X time
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What is the typical speed of walking?
1.4 m/s (5 km/h)
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What is the typical speed of running?
3m/s (11km/h)
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What is the typical speed of cycling?
5.5m/s (20km/h)
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What is the typical speed of cars in a built up area?
13m/s (47km/h)
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What is the typical speed of cars on a motorway?
31m/s (112km/h)
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What is the typical speed of trains?
up to 55m/s (200km/h)
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What is the typical speed of wind?
5-20m/s
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What is the typical speed of sound in air?
340m/s
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What is acceleration?
Acceleration is how quickly you are speeding up.
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What is acceleration different to?
velocity and speed
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What is the equation for acceleration?
a = (v - u)/t
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What is constant acceleration also known as?
uniform acceleration
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What is the gravitational field strength?
10m/s2
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What is the equation for uniform acceleration?
v2 - u2 = 2 x a x X
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A sprinter runs 200m in 25s. Calculate his average speed
8m/s
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A ball is dropped from a height, H, above the ground. The speed of the ball just before it hits the ground is 5m/s. Calculate the height the ball is dropped from. (acceleration due to garvity = 10m/s2)
1.25m
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What does the gradient show on a distance/speed graph?
The speed
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What does a flat section represent on distance/time graph?
The object is stopped
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What does a steeper gradient represent?
The object is going faster
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What do curves represent?
Acceleration
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What represents an object speeding up?
Curve getting steeper
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What represents an object slowing down?
A levelling off curve
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What can be found from a distance/time graph?
The speed
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True or false, you can find the speed at any time on a distance/time graph?
true
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What is a tangent?
A tangent is a line that is parallel to the curve at any point
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Does time (s) go on the Y or X axis?
X axis
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True or false, velocity/time graphs can only have positive gradient?
False. Velocity/time graphs can have both positive AND negative gradient.
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What does a uphill section show on a velocity/time graph?
constant acceleration
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What does a flat section show on a velocity/time graph?
Steady speed
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What does a curve mean on a velocity/time graph?
changing acceleration
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What does a steeper graph mean?
The greater acceleration or deceleration
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What does a downhill section show on a velocity/time graph?
Deceleration
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How do you find the distance travelled on a velocity/time graph?
The area under the graph
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What can you do to make it easier to work out the distance travelled if the acceleration is constant?
You can split the area into rectangles and triangles
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What is Newton's first law?
Newton's first law sates that a resultant force is needed to make something start moving, speed up or slow down
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