You need to determine the coefficient of kinetic friction between a box and a factory floor in order to predict how much force certain machines are going to apply. Explain
how you could determine the coefficient. What equipment would you need?

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

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples