AHMED SALAMAIGCSE PHYSICS · FORCES & MOTION LAB
Effects of forces · Dynamics · Friction

Combine. Predict.
Explain the motion.

Build force diagrams, calculate resultants and acceleration, then investigate friction, drag and the inward force in circular motion.

Investigation 1

Forces on one straight line

Add forces in the same direction and subtract forces in opposite directions.
Investigation 2

Resultant force and motion

An object remains at rest or moves at constant velocity unless a resultant force acts. Use F = ma.
Investigation 3

Solid friction and heating

Friction acts between surfaces, opposes sliding and may produce heating.
Investigation 4

Drag in liquids and gases

Drag opposes an object moving through a fluid. A fluid may be a liquid or a gas.
Investigation 5 · Supplement

Force perpendicular to motion

The force is directed towards the centre and changes direction of motion. Explore the three required qualitative relationships.
Choose a fair comparison
Assessment

Check the forces objectives

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Objectives covered

  1. Determine the resultant of collinear forces.
  2. Apply Newton’s first law and explain changes in velocity.
  3. Recall and use F = ma, with force and acceleration in the same direction.
  4. Describe solid friction, impedance to motion and heating.
  5. Describe drag in liquids and gases.
  6. Explain the required qualitative circular-motion relationships.