Resources:Bathroom scales measuring in Newtons, squared paper.  Possibly sand trays, blocks of wood of various sizes, metre rules, 1kg masses.

plastic gloves, washing up bowls, spouting can with rubber bungs in spouts, straws and syringes, model lung, Magdeburg hemispheres, vacuum pump, treacle tin, coke cans.
 

Metre rules, 10N, Newtonmeters,  1kg sand bags, metre rules, pyramidal block of wood to act as a pivot, 100g slotted masses, thick cardboard, split pins, thin string, scissors.
 

Plastic see-saws, marbles, 10g slotted masses