Question

Question 8 8 pts The properties of collisions are as follows (there may be more than one correct answer): Ap = 0 tsys >> tint Fext << Fint Fext >> Fint AK = 0 tsys << tint D Question 9 8 pts

Answer 1

A collision is the event in which two or more bodies exert forces on each other in about a relatively short time.

Thus, by this definition, it is clear that the interaction time is very short, hence t_int<<t_sys.

Also, the major forces are the forces that the body exert on each other and hence, F_ext<<F_int.

The conservation of momentum holds in both elastic and inelastic collisions. Hence

Ap = 0

While the change in Kinetic energy is zero for elastic collisions, it is not so for inelastic collision. Thus $\Delta KE\neq 0$ for collisions in general.

So, option (1) (2) and (3) are correct.