M2

Question 1

What is the formula for moments?

Answer 1

Force*perpendicular distance

Question 2

If there is If there is a rough surface, where does the normal reaction force act?

Answer 2

Normally to the support, not normally to object

Question 3

What is the formula for calculation of centre of mass for a lamina?

Answer 3

M(x bar)=sum of mx for all centres of mass

Question 4

What can be said of an elastic system if the work done is by gravity?

Answer 4

Mechanical energy is conserved

Question 5

What is the formula for change in energy for a falling object on elastic string?

Answer 5

GPE loss = Ek + Eep

Question 6

Where is is sensible to take 0 gpe from?

Answer 6

The point of the minimum height of the bungee/whatever

Question 7

When is the velocity of a particle on an elastic spring maximum?

Answer 7

When tension=mg as it is not being accelerated in either direction

Question 8

When finding the reaction force in VCM, which two methods do you combine?

Answer 8

Conservation of energy - kinetic at bottom=kinetic at top + change in gravitational potential

Resultant force = +/-reaction +mgcos(0)

Question 9

How do you resolve weight when working with circles?

Answer 9

Radially.