; Lesson K1 Forces and gravity
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# Lesson K1 Forces and gravity

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Catalyst 1, Unit K: Forces and their
effects
Lesson K1: Forces and gravity

Main activities

K1a Mass and weight
For each group:
 a forcemeter (Newton spring balance) reading up to 5 newtons
 four slotted masses and hanger (either 50 g or 100 g would be suitable).
For the class:
 electronic top-pan balance(s) recording up to 500 g
 a stone/large rubber bung/small sand or bean bag – mass approximately half that
of the masses and hanger (i.e. 125 g or 250 g) – clearly labelled ‘A’. If possible,
have more than one of these with the identical mass
 a similar object, of slightly different mass, clearly labelled ‘B’ – again more than
one if possible. It should be possible to hang B from the forcemeter
 bathroom scales, calibrated in kg
 bathroom scales, calibrated in newtons.

Lesson K2: Friction

Starter activities

Recap last lesson
 tin of baked beans

Capture interest
 metal object
 oil lubricant

Main activities

K2a Shoe soles
 For each pair/group:
 a set of masses, 100–600 g
 a shoe
 a forcemeter
 string
 suitable surface to pull the shoe over, e.g. cork tile.

This list is in Microsoft Word, so it can be customised to fit each school’s requirements.      1
Technicians’ lists of equipment

Catalyst 1, Unit K: Forces and their
effects

Lesson K3: Balanced forces

Starter activities

Recap last lesson
suggested materials:
 sandpaper
 glass
 PTFE
 Tape
 Teflon-coated pan
 floor vinyls (some can be smooth but non-slip)

Capture interest (2)
 toy car

Main activities

K3a Stretching
For each pair:
Core:
 a spring
 a clamp stand with two bosses and clamps
 a metre rule
 a mass holder
 masses from 100 g to 600 g, possibly labelled with their weights in newtons.
Extension:
 as above
 an elastic band, about the same length as the spring.

K3b Floating and upthrust
For demonstration:
 a forcemeter with a scale in newtons suitable to show weights of the chosen objects
 three or four objects that will float in water, with loops of string attached
(make sure they weigh enough to register clearly on the forcemeter in air)
 a trough or large beaker of water, ideally transparent and calibrated, so that
level of water can be seen clearly.
For Extension demonstration:
 two large beakers, one containing tap water and one containing the same
volume of very salty water.

This list is in Microsoft Word, so it can be customised to fit each school’s requirements.      2
Technicians’ lists of equipment

Catalyst 1, Unit K: Forces and their
effects

Lesson K4: Unbalanced forces

Starter activities

Recap last lesson
 toy car
 string

Lesson K5: Slow down!

Starter activities

Recap last lesson
 toy car

Lesson K6: Archimedes’ story – Think about

Starter activities

Concrete preparation (2)
 cubes for density investigation
(e.g. from Philip Harris)

Main activities

K4a All unbalanced
1 Getting trolley moving:
 a trolley
 smooth, flat, level surface
 a box containing screwed up paper, for the trolley to crash into.
2 Squashing a can:
 an empty soft drinks can.
3 Trolley changing speed:
 a trolley
 suitable surface – smooth at first and then covered with sand or furry material
 a box containing screwed up paper, for the trolley to crash into.
4 Ball changing direction:
 a ping pong ball
 smooth, flat, level surface
 a box containing screwed up paper, for the trolley to crash into.

This list is in Microsoft Word, so it can be customised to fit each school’s requirements.      3

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