C

P1 & P2 Triple Content Exam Qs notes

answer : A

Why? —-

The perpendicular distance from the pivot to the man is 1.2, 3 times that of the perpendicular distance from the pivot to the load.

  • Therefore, the effort needed is 3 times less of the load (300/3)

answer : C

Why? —-

  • Two 50 N forces act on the left(anticlockwise) of the pivot.

  • Their distances from the pivot are 0.5 m and 0.3 m.

Anticlockwise moment= (50×0.5) + (50×0.3)

25+15= 40 Nm

Keywords:

  • more/less dense

  • altitude(not height)

  1. pressure must be at zero when max altitude is reached

  2. falls exponentially(curved)

  3. must start at max pressure at zero altitude

  • ALWAYS link question back to graph at least once!

cycle goes left = anti-clockwise

1) Child A is going with the cycle to the left, meaning he is going anti-clockwise (you can tell when full circle is drawn). Child B is going clockwise as he is opposite to Child A.

  • clockwise = 2 × 400 = 800 l anti-clockwise = 2 × 500 = 1000

2) Child A is going anti-clockwise. The current force being exerted is 800N.

(rearrange equation)

moment = distance * force » distance = moment / force

  • 800 (the moment of A) / 500 (the load of A) = 1.6m