Question 2
FThe Figure shows a skateboarder on a ramp. The skateboarder starts from rest at point A and rolls down the ramp to point B.
Figure
The mass of the skateboarder and the skateboard is 50 kg.
The gravitational field strength is 10 N/kg.
a.[2]
Use the equation: gravitational potential energy=mass×gravitational field strength×height\text{gravitational potential energy} = \text{mass} \times \text{gravitational field strength} \times \text{height}gravitational potential energy=mass×gravitational field strength×height
Calculate the gravitational potential energy lost by the skateboarder from A to B.
b.[1]
Assume that no energy is transferred to the surroundings.
State the kinetic energy of the skateboarder at B.
c.[2]
The actual kinetic energy of the skateboarder at B is less than your answer to (b).
Explain why.
7.1 Work done Questions
44 exam-style questions on OCR GCSE Physics 7.1 Work done, covering 7.1.1 Conservation of energy in a closed system, 7.1.2 Energy stores and transfers, 7.1.3 Energy changes by heating, forces and current, 7.1.4 Quantifying energy transfers in a system, and 7.1.5 Kinetic, elastic and gravitational potential energy. Each one has a worked solution and a mark scheme showing where the marks go.