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Recap Year 9: Physics
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Differentiate between mass and weight.
Mass is the amount of matter in an object (kg, scalar), weight is the force of gravity on the object (N, vector).
A force of 30 N acts on a 6 kg object. Find acceleration.
a = F ÷ m = 30 ÷ 6 = 5 m/s²
State Newton’s Second Law of Motion.
The force on an object is equal to the rate of change of momentum / F = ma.
From a velocity-time graph, what does the area under the graph represent?
Displacement
From a velocity-time graph, what does the slope represent?
Acceleration
A ball increases its velocity from 4 m/s to 10 m/s in 3 s. Find acceleration.
(10 – 4) ÷ 3 = 2 m/s²
Define acceleration.
Rate of change of velocity per unit time.
State the difference between speed and velocity.
Speed is scalar (no direction), velocity is vector (includes direction).
A car travels 100 m in 20 s. Calculate its average speed.
100 ÷ 20 = 5 m/s
Define speed.
Distance travelled per unit time.
Why does a wooden block float on water while a metal block sinks?
Because density of wood < density of water, while density of metal > density of water.
How do you determine the volume of an irregular solid object?
Use displacement method (measure volume of water displaced in measuring cylinder).
Convert your answer in Q7 to SI unit (kg/m³).
4000 kg/m³
A block has mass 200 g and volume 50 cm³. Find its density in g/cm³.
200 ÷ 50 = 4 g/cm³
State the formula for density.
density = mass ÷ volume
Define vector quantity. Give one example.
A physical quantity that has both magnitude and direction, e.g. velocity / displacement / force
Name one instrument used to measure length accurately.
Vernier caliper / micrometer screw gauge
A student measures a time interval of 2.5 minutes. Express this in seconds.
150 s
Which of the following is a scalar quantity: velocity, force, distance, displacement?
distance
State the SI unit of mass.
kilogram (kg)
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