2: centre of mass

T = mg+ma

tension formula

D

answer

N-mg = ma

N-mg = -ma

lift accelerating __upwards__ with acceleration ‘a’, weight N formula:

lift accelerating __downwards__ with acceleration ‘a’ and weight N formula:

F = thrust-weight

resultant force, thrust, weight formula

answers

mcqs

a single point at which the body’s mass can be thought to be concentrated. it is the single point at which the force of its weight can be thought to act vertically down

what is the centre of mass of a body

it helps us simplify calculations, especially those involving moments of forces about a point

how does the centre of mass help us

where all lines of symmetry cross

where is the centre of mass found

1. suspending the body from a position near its edge
2. allowing it to come to rest
3. drawing a line vertically down, using plumb-line to guide
4. suspending

how do u find the centre of mass