Mechanics

Question 1

Smooth pulley

Answer 1

Nog friction, Tension on either side of pully is equal

Question 2

Light string

Answer 2

Tension is equal throught string

Question 3

Inextensible string

Answer 3

Both particles have same acceleration

Question 4

Particle

Answer 4

Ignore air resistance, ignore rotational effects.

Question 5

Rigid

Answer 5

No thickness

Question 6

Beam as a rod (3 points)

Answer 6

Only has 1 dimension (length)
Mass concentrated along a line
Is rigid (cant bend)

Question 7

Uniform

Answer 7

Weight acts in centre

Question 8

On point of tipping A all other reactions are?

Answer 8

0N

Question 9

Non uniform

Answer 9

Weight not acting at centre

Question 10

Smooth beed

Answer 10

Tension on both sides of the beed are equal

Question 12

Why reaction acts perpendicular to ramp?

Answer 12

Is smooth

Question 14

Lamina

Answer 14

Thickness can be ignored

Question 16

Smooth place Fmax

Answer 16

FMAX = 0
FRICTION = 0

Question 18

Static equilibrium

Answer 18

Resultant forces = 0
At rest

Question 20

State why the frictional force is acting right?

Answer 20

The only other horizontal force is — which is acting left so to oppose motion frictional force must act right.