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SingaporePhysics

Forces and Dynamics

3 dot points across 3 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do forces change the way an object moves, and what does Newton's second law tell us?

State Newton's laws of motion and use the relationship F = ma for a single resultant force
State Newton's three laws of motion, find the resultant of balanced and unbalanced forces, and use F = ma with simple N(A)-Level numbers to link force, mass and acceleration.
8 min answer →

How does friction affect motion, and how do forces make objects turn?

Describe friction and its effects, and calculate the moment of a force about a pivot
Describe friction and its useful and wasteful effects, define the moment of a force, use moment = force times distance, and apply the principle of moments to a balanced beam at N(A)-Level.
8 min answer →

What is the difference between a scalar and a vector, and when is an object in equilibrium?

Distinguish scalars from vectors, add forces acting in a line, and state the conditions for equilibrium
Tell scalars from vectors, add and subtract forces acting along a line to find a resultant, and state the conditions for an object to be in equilibrium at N(A)-Level.
7 min answer →