forces + mass, weight and density

Question 1

force

Answer 1

push or pull exerted by an object on another object

Question 2

normal reaction force

Answer 2

push exerted by a surface on an object resting on it, perpendicular to the surface

Question 3

friction

Answer 3

force that opposes motion between surfaces in contact

Question 4

tension

Answer 4

pull exerted by a stretched spring, string or rope on an object attached to it

Question 5

weight

Answer 5

gravitational force exerted by earth on any object

Question 6

N1L

Answer 6

every object will continue its state of rest or continuous motion in a straight line unless a resultant force acts on it

Question 7

N2L

Answer 7

when a resultant force acts on an object, the object will accelerate in the direction of the resultant force given by F=ma

Question 8

N3L

Answer 8

if body A exerts a force FAB on body B, body B will exert an equal and opposite force FBA on body A

Question 9

mass

Answer 9

amount of matter in a body

Question 10

gravitational field

Answer 10

a region in which a mass experiences a force due to earth’s gravity

Question 11

gravitational field strength

Answer 11

the gravitational force acting per unit mass

Question 12

inertia

Answer 12

reluctance of an object to change its state of rest or motion, due to its mass

Question 13

density

Answer 13

mass per unit volume, given by ρ=m/v