Kinetic and gravitational potential energyIB MYP Physics: Mind map

Exam questions on Kinetic and gravitational potential energy

1. A student in Nairobi throws a 0.50 kg ball straight up into the air from ground level with an initial speed of 12 m/s. Take g = 10 N/kg.
   Describe the energy transfers that happen as the ball rises to its highest point and then falls back to the ground.2 marks
2. A roller-coaster car and its passengers have a total mass of 400 kg. The car is released from rest at the top of a hill that is 25 m above the lowest point of the track at a theme park in Dubai. Take g = 10 N/kg.
   In reality the car reaches the lowest point moving more slowly than the speed predicted when friction is ignored. Explain why.2 marks
3. A class investigates how the height from which a steel ball is dropped affects its speed just before it hits the ground. The ball has a mass of 0.050 kg and light gates measure its speed just before impact. The measured speeds were 1.9 m/s from a height of 0.20 m, 2.8 m/s from 0.40 m, 3.4 m/s from 0.60 m, 3.9 m/s from 0.80 m and 4.4 m/s from 1.00 m. Take g = 10 N/kg.
   Identify the independent variable, the dependent variable and one control variable in this investigation.3 marks