2024/2025 Y12 OCR Physics A Mock Exam Summary and Study Guide

Velocity - AnsRate of change of displacement Acceleration - AnsRate of change of velocity Scalar quantity - AnsA quantity that has magnitude only and has no direction Vector quantity - AnsA quantity that has both magnitude and direction Thinking distance - AnsThe distance travelled by the vehicle in the time it takes the driver to react Braking distance - AnsThe distance travelled by the vehicle after applying the brakes Stopping distance - AnsThinking distance + braking distance Mass - AnsThe amount of matter in an object Weight - AnsA measure of the force of gravity on an object Centre of mass - AnsThe point where the entire weight of an object seems to act Equilibrium - AnsWhen the net forces and net moment on an object are both zero Moment - AnsForce x perpendicular distance from pivot Principle of moments - AnsAn object is in equilibrium if the sum of the clockwise moments is equal to the sum of the anticlockwise moments about the same point. Couple - AnsWhen a pair of equal but opposite forces are applied in parallel but along different lines Torque of a couple - AnsThe product of one of the forces of a couple and the perpendicular distance between the forces Density - AnsMass per unit volume Pressure - AnsForce per unit area. Archimedes' Principle - AnsStates that the buoyant force is equal to the weight of the fluid displaced by an object. Work done - AnsForce x distance moved in direction of force