A uniform timber plank, of mass $m$ kilograms and length 4.0 m, rests on a flat rooftop. The end of the plank, $B$ , projects 1.5 m beyond the edge of the roof, $A$ .

A toolbox of mass 20 kg is placed on the plank at the midpoint of the overhanging section $A B$ . The plank is in equilibrium and on the point of tilting about $A$ . Show that $m = 30$ .

The toolbox is removed. A number, $n$ , of identical stone tiles, each of mass 4 kg, are stacked on the plank at a point 0.2 m from the end $B$ . Determine the maximum value of $n$ such that the plank does not tilt.

State one assumption you have made about the plank.

A uniform timber plank, of mass $m$ kilograms and length 4.0 m, rests on a flat rooftop. The end of the plank, $B$ , projects 1.5 m beyond the edge of the roof, $A$ .

A toolbox of mass 20 kg is placed on the plank at the midpoint of the overhanging section $A B$ . The plank is in equilibrium and on the point of tilting about $A$ . Show that $m = 30$ .

State one assumption you have made about the plank.

3.6 Rigid Bodies (A-level only)

Question 19

Markscheme

3.6 Rigid Bodies (A-level only)

Question 19

Markscheme

3.6 Rigid Bodies (A-level only)

Question 19

3.6 Rigid Bodies (A-level only) Questions

3.6 Rigid Bodies (A-level only)

Question 19

3.6 Rigid Bodies (A-level only) Questions