1.5.1 — Effects of forces

Core

• 1.5.1.1 — Know that forces may produce changes in the size and shape of an object
• 1.5.1.2 — Sketch, plot and interpret load–extension graphs and describe the experimental procedures
• 1.5.1.3 — Determine the resultant of two or more forces acting along the same straight line
• 1.5.1.4 — Know that an object remains at rest or continues at constant speed unless acted on by a resultant force
• 1.5.1.5 — State that a resultant force may change the velocity of an object by changing speed or direction
• 1.5.1.6 — Describe solid friction as the force between surfaces that may impede motion and produce heating
• 1.5.1.7 — Know that friction (drag) acts on an object moving through a liquid
• 1.5.1.8 — Know that friction (drag) acts on an object moving through a gas (air resistance)

Supplement

• 1.5.1.9 — Define the spring constant as force per unit extension; recall and use k = F/x
• 1.5.1.10 — Define and use the term ‘limit of proportionality’ on a load–extension graph
• 1.5.1.11 — Recall and use F = ma and know that acceleration is in the same direction as the force
• 1.5.1.12 — Describe qualitatively motion in a circular path due to a perpendicular force