Where does a skater have the most kinetic energy?

Answer 1

At rest at top of slope, it is all potential energy(mass * g * vertical distance to bottom of slope). Ignoring friction losses, this will translate to all kinetic energy at the bottom. kinetic energy = 0.5 * mass * velocity squared

example:

mass of sled + rider = 100 kg

g = 9.82 ((m/s)/s) acceleration due to gravity

vertical distance = 20 metres

so:

potential energy at slope top = 100 * 9.82 * 20 = 19 640 joules

so:

kinetic energy at bottom = 19 640 joules

so :

19 640 = 0.5 * 100 * velocity ^2

so:

velocity = square root (19 640 / (0.5 * 100))

velocity = 19.82 metres / sec

Answer 2

At the bottom of the hill, the skateboard's potential mechanical energy has all been converted to kinetic energy if it was allowed to roll.

Its chemical potential energy remains the same. That energy can be released--converted to kinetic or heat energy by setting the board on fire.

Answer 3

Kinetic energy depends on mass and speed, and the mass will presumably not change much - so the skater has the highest kinetic energy when he is fastest. This will typically occur after going down a ramp, etc.

Answer 4

Mostly when they are Skateboarding

Answer 5

before they go down the incline.