Maia is at a skatepark. She stands on her skateboard as it rolls in a straight line down a gentle slope at a constant speed of 3.0 m s
The combined mass of Maia and the skateboard is 65 kg.
- In Figure 9, the combined system of Maia and the skateboard is modelled as a small box with point
at the centre of mass. - Draw and label arrows to represent each of the forces acting on the system - that is, Maia and skateboard as they roll down the slope. (3 marks)
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- Calculate the magnitude of the total frictional forces acting on Maia and the skateboard. (2 marks)
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Near the bottom of the ramp, Maia takes hold of a large pole and comes to a complete rest while still standing on the skateboard. Maia and the skateboard now have no momentum or kinetic energy.
- Explain what happened to both the momentum and the kinetic energy of Maia and the skateboard. No calculations are required. (2 marks)
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