A spacecraft is travelling at a constant velocity in deep space. Active thrusters are fired, applying a non-zero resultant force to the spacecraft.
(i) State two different changes to the motion of the spacecraft that this resultant force can cause.
(ii) If a similar force is applied to a stationary rubber block resting on a kitchen counter, state one way, other than motion, in which the block can be affected.
Describe how a uniform metre rule, a pivot, and a selection of standard weights can be used in a school laboratory to verify the principle of moments (that for an object in equilibrium, the sum of clockwise moments equals the sum of anticlockwise moments).
245 exam-style questions on CIE IGCSE Physics 1.5 Forces, covering 1.5.1a Forces, resultant force and motion, 1.5.1b Load–extension graphs and the spring constant, 1.5.1c Friction and drag, 1.5.1d Force, mass and acceleration, 1.5.1e Motion in a circular path, 1.5.2a Moment of a force, 1.5.2b Principle of moments and equilibrium, and 1.5.3 Centre of gravity and stability. Each one has a worked solution and a mark scheme showing where the marks go.