PHYSICS - Trial Paper Collection

papercollection7SECTION BMARKNOMARKING CRITERIASUB TOTAL9(a) State the meaning correctly 1- Product of mass and velocity / /momentum = mass x velocity 1(ii)State the total momentum in Diagram 9.1 correctly- ZeroCompare the total momentum correctly- Total momentum before the bullet is fired = total momentumafter the bullet is fired.Compare the magnitude of the momentum of the bullet andpistol correctly- EqualCompare the direction of the momentum of the bullet andpistol correctly- Opposite1111Name the physics principle correctly- Principle of Conservation of Momentum15(b)Describe the propulsion of a rocket engine correctly- Liquid oxygen and liquid hydrogen/fuel is pump into thecombustion chamber for combustion- The exhaust gas is ejected out of the rocket nozzle at high speed.- The ejected exhaust gas at high speed has a large momentum.- According to the Principle of Conservation of Momentum, therocket acquires a large momentum forward1111 4(c) State aspect of blade correctly 1- Using bigger blades/increase the number of blades/increase thespeed of bladeState reason for aspect of forces and motion correctly- Increase the air intakeState aspect of material of blade correctly- Blade made of strong materialState reason for aspect of material of blade correctly- Can withstand strong pressure/it will not break easilyState aspect of fuel injector correctly- Increase the number of fuel injectors//add more fuel injectorsState reason for aspect of fuel injector correctly- More fuel to be burnt to produce greater thrust11111