Friction is a necessary evil collect pictures from real life that can show friction is needed at many situations where as it have some had effect in some other situation

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

What are the three ways that an object can accelerate

What is the measure of a change in an objects velocity?