Define periodic table i m so boreddd​

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.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?