A skateboarder rolls down a ramp from rest.
The mass of the skateboarder is 60.0 kg60.0\text{ kg}60.0 kg. The vertical height of the ramp is 5.0 m5.0\text{ m}5.0 m. The gravitational field strength is 9.8 N/kg9.8\text{ N/kg}9.8 N/kg.
Calculate the gravitational potential energy of the skateboarder at the top of the ramp. 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×heightAt the bottom of the ramp, the speed of the skateboarder is 9.0 m/s9.0\text{ m/s}9.0 m/s. Calculate the kinetic energy of the skateboarder at the bottom of the ramp. Use the equation:
kinetic energy=0.5×mass×(speed)2 \text{kinetic energy} = 0.5 \times \text{mass} \times (\text{speed})^2 kinetic energy=0.5×mass×(speed)2Describe why the kinetic energy of the skateboarder at the bottom of the ramp is less than their gravitational potential energy at the top of the ramp.
44 exam-style questions on AQA GCSE Physics 1.1 Energy changes in a system, and the ways energy is stored before and after such changes, covering 1.1.1 Energy stores and systems, 1.1.2 Changes in energy, 1.1.3 Energy changes in systems, and 1.1.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.