1.1 (d)
Contents
Class Experiment 1
Circus of N III toys.
Resources
Analysis
Diagrams with all of the Newton pairs identified - DIRECTION, TYPE and SIZE
Equipment
Safety
Demonstration 1
Roller on board
Resources
Here is a sheet with the relevant diagrams for discussion before the demonstration
Analysis
Get the pupils to make a prediction about which pencil will fall over.
Equipment
Pre made set up.
Safety
Demonstration 2
Skate boards - this can either be done well with a ruler between the pupils or possibly even better, throwing a medicine ball between pupils. It is easiest to start with two pupils of the same mass, moving on to a massive and small pupil.
Resources
Analysis
The pupils should look for the effect of an individual push or pull eventually pushing/pulling at the same time.
Equipment
2 x skate baords 1x 1m ruler 1x large medicine ball
Safety
Medicine balls can be used from 3rd form and above, although great care must be taken particularly when choosing the pupils; err on the side of caution, especially with weak of light pupils.
Demonstration 3
Sprinter's blocks - this is an untried demo! The idea is to use the pasco pressure sensor to show that you push backwards on the Earth and the Earth pushes forwards on you!
Resources
Analysis
Equipment
Safety
Make sure the object that is being pushed against is strong enough to take the force. Make sure you give the pupils enough space.
Demonstration 4
Weights over a bench - you have two masses attached to either end of a newtonmeter, run over two pulleys over the length of a bench.
Resources
Analysis
Note the force when the weights are identical. Add a known extra weith to one end, note if there is a change in force. This could be extended to doing F=ma
Equipment
2x pulley 1x Newtonmeter 2x equal masses + extra masses Thread
Safety
If you use large masses - mind your feet.
