Download Tutorial 84C1 - Forces - Answers

 Year 11 Physics Tutorial 84C1 – Net Force Answers Situation Free Body Force Diagram A car moving along the freeway at a constant velocity Net Force and Direction Engine Friction No net force A car accelerating from a set of traffic lights Friction Engine Net force forwards A stationary book on a table Reaction force No net force Weight A car braking in order to stop at a set of traffic lights Brakes Net force backwards A skateboarder accelerating down a hill or slope Friction Weight A horse pulling a cart moving at a constant speed Friction Horse No net force Net force down the slope Situation Free Body Force Diagram Net Force and Direction Engines Resistance An ocean liner that is accelerating Net force to the right Hot air A hot air balloon ascending upwards with a constant velocity No net force Weight Air resistance A person in a parachute accelerating towards the ground Net force downwards Weight An airplane moving at a constant velocity and altitude Lift Air resistance Engines No net force Weight An airplane moving horizontally at a constant speed but descending ready for landing Lift Air resistance Engines Net force downwards Weight An airplane ascending after take-­‐off and accelerating in the direction of motion Air resistance Lift Engines Net force forwards and upwards Weight Air resistance A car pulling a caravan and accelerating down a hill Reaction Net force forwards and downwards Engine Weight Page 2