forces

Question 1

friction

Answer 1

a contact force that opposes the relative motion between 2 bodies in contact, or, tends to oppose 1 body from moving relative to the other.

Question 2

hooke’s law

Answer 2

force is proportional to its extension, provided that the limit of proportionality has not been exceeded. (F=kx)

Question 3

spring constant

Answer 3

is the constant of proportionality between force and extension for a sample of material that has not been stretched to such an extent that it has exceeded the elastic limit.

Question 4

upthrust

Answer 4

the net upward force exerted by a fluid on a body as a result of the body being immersed (either fully or partially) in the fluid.

Question 5

archimedes’ principle

Answer 5

when an object is totally or partially immersed in the fluid, it experiences an upward force (upthrust) equal to the weight of fluid displaced.

Question 6

principle of floatation

Answer 6

an object floats in a fluid when it displaces a weight of fluid equal to its own weight.

Question 7

centre of gravity

Answer 7

the point at which the whole weight of a body may be thought to act.