Which point on the pendulum's swing represents the minimum potential energy? a) a b) b c) c d) a & c

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

What will a positive and a negative charge do if they are separated from each other?

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?