SECTION 17- FORCES AND NEWTON'S LAWS

Question 1

State Newton’s 1st law

Answer 1

• every object continues in a state of rest or uniform motion in a straight line unless acted on by a resultant external force

Question 2

State Newton’s 2nd law

Answer 2

• Resultant force = mass x acceleration

Question 3

State Newton’s 3rd law

Answer 3

• When one object exerts a force on another there’s always a reaction, which is equal and opposite in direction to the acting force

Question 4

What are the three main base S.I. units

Answer 4

• length: metre (m)
• time: second (s)
• mass: kilogram (k)

Question 5

What does the term ‘particle’ mean

Answer 5

• the body is a point, so its dimensions don’t matter

Question 6

what does the term ‘light’ mean

Answer 6

• the body has no mass

Question 7

what does the term ‘static’ mean

Answer 7

• the body isn’t moving

Question 8

what does the term ‘rough’ mean

Answer 8

• the surface will oppose motion with friction / drag

Question 9

what does the term ‘beam’ or ‘rod’ mean

Answer 9

• a long particle (e.g. a carpenters plank)

Question 10

what does the term ‘uniform’

Answer 10

• the mass is evenly spread out throughout the body

Question 11

what does the term ‘non-uniform’ mean

Answer 11

• the mass is unevenly spread out

Question 12

what does the term ‘rigid’ mean

Answer 12

• the body doesn’t blend

Question 13

what des the term ‘thin’ mean

Answer 13

• the body has no thickness

Question 14

what does the term ‘equilibrium’ mean

Answer 14

there’s no resultant force

Question 15

what does the term ‘plane’ mean

Answer 15

• it’s a flat surface

Question 16

what does the term ‘inextensibile’ mean

Answer 16

• the body can’t be stretched

Question 17

what does the term ‘smooth’ mean

Answer 17

• the surface doesn’t have friction / drag opposing motion