How does friction change energy? 1 Energy lost from machine changes into heat energy.
2 Friction causes energy to disappear.
3 Friction causes energy to get destroyed.
4 Energy changes from heat energy to mechanical energy.

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

Asap and show ! a 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.

You are given two vectors a⃗ =−3.00ι^ 5.00j^ and b⃗ =5.00ι^ 2.00j^. let the counterclockwise angles be positive.