Newton's laws of motionIB MYP Sciences: Mind map

Exam questions on Newton's laws of motion

1. A car of mass 1500 kg is waiting at traffic lights in Singapore. When the light turns green, the engine produces a resultant forward force of 4500 N on the car.
   Explain, using Newton's first law, why passengers lurch forward when the car brakes suddenly.2 marks
2. A skydiver in New Zealand jumps from a plane and falls for some time before opening her parachute. Her weight is 700 N.
   Explain why the skydiver's speed stops increasing before she opens her parachute.2 marks
3. Lena, a student in Berlin, investigates how the resultant force on a trolley affects its acceleration. The trolley has a mass of 1.0 kg and runs on a low-friction track. She pulls it with different constant forces and measures its acceleration with a data logger. The accelerations are 0.5 m/s² for 0.5 N, 1.0 m/s² for 1.0 N, 1.6 m/s² for 1.5 N, 2.0 m/s² for 2.0 N and 2.5 m/s² for 2.5 N.
   State a testable hypothesis for this investigation, with a scientific reason, and identify one variable that Lena must control.3 marks