Vectors are quantities that have both _____(1)_____ and _____(2)_____
(1) Direction ; (2) Magnitude
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Scalar quantities have only ____________
Magnitude
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Give 3 examples of vector quantities
May include: Force, Acceleration, Velocity, Momentum, Displacement, Weight
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Give 3 examples of scalar quantities
May include: Mass, Distance, Speed, Time, Length, Temperature
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Is it vectors or scalars which can be both positive and negative?
Vectors
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What is velocity?
Speed in a specified direction
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What is displacement?
Distance travelled in a specified direction
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What is acceleration?
The rate of change of velocity
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The next 4 questions are based on vector notation not scalar
...
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What vector is represented by 's' and what is it measured in?
Displacement measured in metres (m)
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What vector is represented by 'v' and what is it measured in?
Velocity measured in metres per second (m/s)
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What vector is represented by 'a' and what is it measured in?
Acceleration measured in metres per second squared (m/s^2)
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What vector is represented by 'F' and what is it measured in?
Force measured in newtons (N)
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What is another way of describing velocity?
The rate of change of displacement
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Therefore what is the equation linking velocity and displacement?
Velocity = Displacement ÷ Time
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What is the equation linking acceleration and velocity?
Acceleration = Velocity ÷ Time
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A car travels 10km due West followed by a journey of 15 km due south in a time of 1 hour. Calculate their displacement.
Displacement^2 = 15^2 + 10^2 = 225 + 100 = 325 ; so displacement = 18 km
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What is the equation linking acceleration, final velocity and initial velocity?
Acceleration = (Final velocity - Initial velocity) ÷ Time ; a = (v - u) ÷ t
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For the next question you need to rearrange the previous equation to make final velocity the subject...
Final velocity = Initial velocity + (Acceleration x Time) ; v = u + at
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A car is travelling at 10 m/s when the driver accelerates at 2 m/s^2 for 10 seconds. Calculate the final velocity.
v = u + at ; 10 + (2 x 10) = 10 + 20 = 30 m/s
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What is a ticker timer?
A machine which produces dots on a piece of paper to enable us to work out speed and / or acceleration at any point
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If the amount of dots is 50 per second, then what is the time interval between dots
There is an interval of 1 / 50 or 0.02 seconds between dots
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What alternative experiment uses time to work out the acceleration of an object?
The use of light gates and a datalogger
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What happens during this experiment?
We place an interrupt card on a set of wheels allowing it to slide down a ramp through a light gate. The computer would then calculate the speed at the start and end of the interrupt card. These speeds are used to calculate the acceleration.
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Other cards in this set
Card 2
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Vectors are quantities that have both _____(1)_____ and _____(2)_____
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