Mechanics

Question 1

What is Newton’s first law?

Answer 1

If a body is at rest it will remain at rest and if moving it will continue to move in a straight line with constant velocity until acted upon by an external force

Question 2

What is Newton’s second law?

Answer 2

If a body experiences a resultant force in a direction it will accelerate in that direction such that resultant Force = mass x acceleration

Question 3

What is Newton’s Third Law?

Answer 3

For every force acting on a body, an equal and opposite force acts in another body

Question 4

What are the suvat equations?

Answer 4

v=u+at
S=ut + 1/2at^2
S=vt - 1/2at^2
S= (u+v) / 2 x t
V^2 = u^2 + 2as

Question 5

What does inextensible mean?

Answer 5

does not vary in length

Question 6

What does light mean?

Answer 6

negligible mass

Question 7

What does particle mean?

Answer 7

negligible dimensions

Question 8

What does negligible mean?

Answer 8

small enough to ignore

Question 9

What does smooth mean?

Answer 9

negligible friction

Question 10

What does uniform mean?

Answer 10

the same throughout

Question 11

For vector non constant acceleration what should you not forget?

Answer 11

• Wiggles
• vwiggle = drwiggle / dt
• awiggle= dvwiggle / dt

Question 12

What is Fmax?

Answer 12

F

Question 13

When is it at Fmax?

Answer 13

When moving, or at point of slipping

Question 14

What about a block on the slope?

Answer 14

If block in equilibrium fiction is just the force needed to stop movement which might not be Fmax