Formative Practice 2.2 (Question 1 – 3) – Physics Form 4 Chapter 2 (Force and Motion I)

Question 1:How do you determine(a) velocity from a graph of displacement against time?(b) acceleration from a graph of velocity against time?(c) displacement from a graph of velocity against time? Answer:(a) For displacement-time graph: Velocity = gradient of the graph(b) For velocity-time graph: Acceleration = gradient of the graph(c) For velocity-time graph: Displacement = area under … Read more

Gravity

Gravitational Field A gravitational field as a region in which an object experiences a force due to gravitational attraction. Gravitational Field Strength The gravitational field strength at a point in the gravitational field is the gravitational force acting on a mass of 1 kg placed at that point. The unit of gravitational field strength is … Read more

Spring

Arrangement in series: Arrangement in parallel: Extension = x × number of springStiffness decreasesSpring constant = k/number of spring Extension = x ÷ number of springStiffness increasesSpring constant = k × number of spring Factors Affecting the Stiffness of Spring Stiffer Less stiff Material type of spring(A steel spring is stiffer than a copper spring) … Read more

Hooke’s Law

Hooke’s Law Hooke’s Law states that if a spring is not stretched beyond its elastic limit, the force that acts on it is directly proportional to the extension of the spring. Elastic Limit The elastic limit of spring is defined as the maximum force that can be applied to a spring such that the spring … Read more

Elasticity

Elasticity Elasticity is the ability of a substance to recover its original shape and size after distortion. Forces Between AtomsThe intermolecular forces consist of an attractive force and a repulsive force. At the equilibrium distance, d, the attractive force equal to the repulsive force. If the 2 atoms are brought closer, the repulsive force will … Read more