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section 1general physics
1.2motion
  • define speed, velocity and acceleration
  • plot & interpret distance–time and speed–time graphs
syllabus noteacceleration of free fall g ≈ 9.8 m/s².
+ note
1.3mass & weight
  • know mass is a measure of the quantity of matter
  • recall weight = mass × gravitational field strength
+ note
1.4density
  • recall and use ρ = m / V
+ note
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1.2 · motion
speed & velocity

speed is the distance travelled per unit time. velocity is speed in a stated direction, a vector quantity with both size and direction.

acceleration

acceleration is the rate of change of velocity. a negative value means the object is slowing down.

on a distance–time graph, the gradient of the line gives the speed of the object.
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mcqs 8theory 4
12345678
question 41 mark
a car travels 100 m in 5 s. what is its average speed?
A5 m/s
B20 m/s
C500 m/s
D2 m/s
explanationspeed = distance ÷ time = 100 m ÷ 5 s = 20 m/s. option C confuses the units.
topic score 12 / 24 correct
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may/june 2024
physics · IGCSE
paper 41
QP / MS
0625/41 · question paper
QPMSinsert
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⌖ looking at 1.2 motion
hi! i'm your notes assistant. ask me anything about what you're reading.
why is velocity a vector but speed isn't?
speed only tells you how fast. velocity also tells you which direction, and that direction is what makes it a vector.
sourcesyour notes · 1.2cie 0625
so is a car going round a circle at constant speed accelerating?
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igcse physics (0625) · nov 2021 · paper 41 · QP
igcse maths (0580) · jun 2022 · paper 22 · QP
igcse chemistry (0620) · nov 2023 · paper 42 · QP
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