A cyclist and her bicycle have a total mass of 75 kg.
She rides along a flat road at a speed of 6.0 m/s.
Use the equation: kinetic energy=12×mass×(speed)2\text{kinetic energy} = \dfrac{1}{2} \times \text{mass} \times (\text{speed})^2kinetic energy=21×mass×(speed)2
Calculate the kinetic energy of the cyclist and her bicycle.
The cyclist increases her speed to 12 m/s.
Calculate the new kinetic energy of the cyclist and her bicycle.
The cyclist then applies the brakes and stops.
Describe the energy transfers as the bicycle slows down.
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.