Which force is a contact force A. Leaves falling
B. A bike Braking
C. A magnet pulling
D. Lighting forming

B. a bike braking

Explanation:

It involves friction! Hope this helps!

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".