A child with a mass of 36 kg carries a sled with a mass of 14 kg to the top of an evenly sloping hill, walking 33 m along the hillside and moving vertically upward by 8.8 m. The child puts the sled on the slope where it is just held in place by friction and carefully climbs on board. The added weight of the child is just enough to start the sled moving and it slides down the hill, moving at 10 m/s when it arrives at the base of the slope.
How much energy is dissipated during the sled’s downhill motion?
What average force of friction does the hillside apply to the sled during the sled’s motion? Answer to the nearest newton.
An object with a velocity is slowed to rest by a constant force over a distance of 12 m. If the object’s velocity is increased to and then is again applied to decelerate the object, how far does the object move between the force being applied and the object coming to rest?
A ball with an initial velocity of 20 m/s rolls along a curved surface, as shown in the diagram. The mass of the ball is 100 g. Assume that the only energy conversions that take place are between the kinetic energy and the gravitational potential energy of the ball and calculate the height of the ball at different positions, to the nearest meter.