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SingaporePhysics

Measurement and Kinematics

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do we choose the right instrument to measure a length or a time interval accurately?

Select and use rules, vernier calipers, micrometers, and stopwatches, and reduce errors such as parallax and zero error
A focused answer to the O-Level Physics outcome on measuring length and time. Choosing the metre rule, vernier calipers, or micrometer for a given precision, reading them, zero error, parallax, and timing with a stopwatch and the pendulum method.
7 min answer →

How do distance-time and velocity-time graphs describe motion, and what happens to a body in free fall?

Interpret distance-time and velocity-time graphs and describe free fall and the effect of air resistance on a falling body
A focused answer to the O-Level Physics outcome on motion graphs and free fall. Reading gradients and areas on distance-time and velocity-time graphs, acceleration of free fall, and how air resistance leads to terminal velocity.
8 min answer →

How do physicists describe the world using a small set of base quantities, units, and prefixes?

State the SI base quantities and their units, use standard prefixes, and distinguish scalars from vectors
A focused answer to the O-Level Physics outcome on physical quantities. SI base quantities and units, standard prefixes from nano to giga, standard form, and the difference between scalars and vectors.
7 min answer →

What is the difference between speed, velocity, and acceleration, and how are they calculated?

Define speed, velocity, and acceleration, and calculate them for objects moving in a straight line
A focused answer to the O-Level Physics outcome on speed, velocity, and acceleration. Definitions, average versus instantaneous speed, the link between velocity and acceleration, and straight-line calculations with correct units.
7 min answer →