Handy experiments When two objects are rubbed together, they produce a certain amount of heat through friction. Complete this activity to find out what heat you feel when you rub your hands in different conditions. Equipment: items described in the first column Procedure:
í˘ą For each experiment, rub hands together at the same speed, 20 times. Allow your
r o e t s Bo r e p ok u S
hands to ‘cool’ down before you try the next one.
í˘˛ Complete the first experiment and rate the heat you feel between 1 and 5 (5 being the warmest).
í˘ł Before each experiment, predict whether you think you will feel more or less heat í˘´ Record your results. What to do
Rub hands together
My prediction
1
2
3
4
ew i ev Pr
Teac he r
than in the first experiment.
Results
5
1
2
3
4
5
4
5
3
4
5
3
4
5
3
4
5
Š R. I . C.Publ i cat i ons •f orr evi ew p ur posesonl y• More heat
Rub hands on carpet
1
2
3
1
Rub hands on desk
. te
Less heat
2
o c . che More heat e Rub hands under cool r 1 2 o t r s su tap water r e p Less heat Rub hands with hand lotion on them
More heat 1
2
Less heat
What did you discover by doing these ‘handy’ experiments? Explain your findings on the back of this sheet. R.I.C. PublicationsŽ
www.ricpublications.com.au
69
AUSTRALIAN CURRICULUM SCIENCE
Physical sciences
w ww
More heat
m . u
Less heat