Is it true or false that All moving objects don’t have momentum.

In a system, when potential energy decreases, then entropy also decreases. true false

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.