Visit the following simulation: https://phet.colorado.edu/sims/html/forces-and-m

Question

Visit the following simulation: https://phet.colorado.edu/sims/html/forces-and-motion-basics/latest/forces-and-motion-basics_en.html

a) What appears to be the maximum frictional force (on the default setting) in Newtons that can be generated from the force the man can apply? Find this by increasing the weight he has to push.

Play around with the simulation.

b) In the following simulation: https://phet.colorado.edu/sims/html/energy-skate-park-basics/latest/energy-skate-park-basics_en.html

which kind of friction is responsible for the "thermal energy" that causes violation of conservation of energy?

Explanation / Answer

a) the maximum force applied by the man still the box is at rest, that force is equal to maximum frictional force.

b) In case of energy skate park the rolling friction is responsible for thermal energy that causes violation of conservation of energy

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