What type of friction acts when the books are at rest but a force is exerted?

How can a passenger tell when the seatbelt is properly used? when it clicks. when it is loosely draped across the lap. when it crossed the sternum and is snug across the lap. when the seatbelt is very tight across the sternum and lap?

If a passenger train is travelling on a straight track with a negative velocity and a positive acceleration, is it speeding up or slowing down?

The gravitational force between two objects of masses m1 and m2 that are separated by distance r is The gravitational force between two objects of masses and that are separated by distance is A. proportional to r. B. proportional to 1/r. C.

What evidence of a chemical change is observed when rust forms on iron

Peas can both cross-pollinate and self pollinate. why was this a key factor in Mandela work

Is the following sentence true or false? Some information about an object or process may be missing from a model.

If V is a velocity, l a length, and v a fluid property having dimensions of L2T-1, which of the following combinations are qualitatively dimensionless (show work for a through d) : (a) V l v (b) Vl/v (c) V2v (d) V / (l v)

What happens to the total mechnical energy of the apple as it falls from the tree?

Fair Bonus Question: Derive the equation for gravitational potential energy, starting with the definition of work.

A juggler throws a bowling pin into the air with an initial velocity. Another juggler drops a pin at the same instant.