P2 Answers Already Passed

The arrow represents the force on the water produced by the engine propeller.This force causes the boat to move. Explain why. {Ans: (produces) a force from water on the boat in the forward direction}Write down one possible hazard that the student should have written in the risk assessment and what the student should do to reduce the risk of the hazard causing an injury. {Ans: spilling boiling / hot water suitable precaution to reduce risk from hot water eg clamp the probe / complete the experiment standing}Explain why it is sometimes necessary for scientists to replace a scientific model. {Ans: new scientific evidence / data is obtained which cannot be explained by the mode}What happens, as the cable is cut, to cause the RCCB to switch the circuit off? {Ans: • (some) current flows to Earth • current flows through copper braid • RCCB detects difference between current in live and neutral wire}Explain why the car reaches a top speed even though the thrust force remains constant at 3500 N. {Ans: as speed increases so does the size of the drag force eventually the drag force becomes equal to the thrust the resultant force is