CHAP 1

Question 1

A force is a _ or _ action

Answer 1

push or pull

Question 2

give an exemple of a non contact force

Answer 2

gravitational attraction

Question 3

true or false internal force can produce change in motion of the body center of mass

Answer 3

false

Question 4

what can only change the motion of the system

Answer 4

external force

Question 5

what can only change the shape of the system

Answer 5

internal force

Question 6

what is a motive force

Answer 6

tends to lead to a change in motion in the form of increased velocity or change in direction of the system

Question 7

what is a resistive force

Answer 7

prevent changes in motion by other external forces or decrease the velocity of a system that is already in motion.

Question 8

where does gravitational pull is concentrated

Answer 8

center of mass

Question 9

which one between the coefficient of kinetic friction and static friction is lower

Answer 9

kinetic.
as soon as the applied parallel force exceeds the static friction force and the object begins to slide, friction force actually decreases.