Day length Squeezing & stretching 1.
J.P. has been asked to design an experiment. Her assignment is to stretch an elastic band and to measure both the force on the band and the amount of stretch.
DESIGN an experiment she could carry out.
DRAW the apparatus here.
DESCRIBE what she must measure.
© KCL/PENTECH/WCED 2000
Day length Squeezing & stretching 2.
0
Here is J.P.’s apparatus
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10
10
20
20
30
30
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100 g 50 cm
40
50 cm
DESCRIBE the easiest way to measure the stretch ?
MARK on the diagram the stretch of the rubber band.
WRITE DOWN your readings for Force and Stretch.
© KCL/PENTECH/WCED 2000
Day length Squeezing & stretching 3.
In this experiment J.P. is squashing some plastic foam
100 g
30
30
20
20
10
10
0 30
0 30
20
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10
10
0
0
TAKE READINGS and complete the table Force in grams weight Height of foam in centimetres Compression of foam in centimetres 0 15 0 200 10 5
5
© KCL/PENTECH/WCED 2000
Day length Squeezing & stretching 4.
Here are some results from a squashing experiment Force in grammes weight Length in centimetres Squash in centimetres PLOT these values as a line graph. 0 25 0 100 21 4 200 19 6 300 18 7 400 17,5 7,5
8
6 Squash in Centimetres 4
2
0
100 200 300 Force in grams weight
400
EXPLAIN how the information in the table or the graph tells you the foam becomes more difficult to squash the more you squash it.
© KCL/PENTECH/WCED 2000
Day length Squeezing & stretching 5.
Here is a graph from a stretching experiment. A nylon thread and a metal wire of the same length and thickness were used.
nylon thread
4
Extension in millimetres
3
2
1
metal wire
0 200 400
600
800
Force in gram weight
DESCRIBE the behaviour of the materials in your own words.
© KCL/PENTECH/WCED 2000
Day length Squeezing & stretching 6.
J.P.’s teacher has asked her to do a home assignment. She has to write an explanation of why some materials are more difficult to squash than others.
Help J.P. out. WRITE your explanation here.
© KCL/PENTECH/WCED 2000