Name:………………………………………………………………. Class:………………………….. AIM To investigate and verify Hooke’s law for simple springs HYPOTHESIS Hooke’s law states that when an elastic materials (e.g. a spring) is subjected to a force F, its extension x is proportional to the applied force. APPARATUS AND MATERIALS 1 spring, retort stand and clamp, metre ruler, a mass hanger, pin, 50 g masses ARRANGEMENT OF THE APPARATUS VARIABLES Manipulated variable:………………………………………….. Responding variable:……………………………………………. Controlled variable:………………………………………………. PROCEDURES (for student’s reference) 1. Set up the equipment as shown in Figure 1. Hang a mass hanger so that the spring is vertical. 2. Measure and record the initial position of the indicator pin. 3. Add a 50 g mass to the mass hanger and record the position of the pin. This position minus the position of the pin in step 2 will be equal to the extension of the spring. 4. Repeat steps 2 and 3 by adding more 50 g mass, each time recording the total added mass and the corresponding extension. PROCEDURES 1………… 2………… 3……………… 4…………. (Student rewrites the above procedures/steps using passive sentences) DATA COLLECTION 1. Calculate the applied force (F) for each mass added. Results: Table 1 Mass/g Force/N Initial Position Final Position Extension /cm 0 50 100 150 200 250 DATA ANALYSIS 2. Draw a graph of extension against force.

Peka 2+ Hooke's Law

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Name:………………………………………………………………. Class:…………………………..

AIM To investigate and verify Hooke’s law for simple springsHYPOTHESIS Hooke’s law states that when an elastic materials (e.g. a spring) is subjected

to a force F, its extension x is proportional to the applied force.APPARATUS AND MATERIALS

1 spring, retort stand and clamp, metre ruler, a mass hanger, pin, 50 g masses

ARRANGEMENT OF THE APPARATUS

VARIABLES Manipulated variable:…………………………………………..Responding variable:…………………………………………….Controlled variable:……………………………………………….

PROCEDURES (for student’s reference)

1. Set up the equipment as shown in Figure 1. Hang a mass hanger so that the spring is vertical.2. Measure and record the initial position of the indicator pin.3. Add a 50 g mass to the mass hanger and record the position of the pin. This position minus the position of the pin in step 2 will be equal to the extension of the spring.4. Repeat steps 2 and 3 by adding more 50 g mass, each time recording the total added mass and the corresponding extension.

PROCEDURES 1…………2………… 3……………… 4…………. (Student rewrites the above procedures/steps using passive sentences)

DATA COLLECTION 1. Calculate the applied force (F) for each mass added.Results: Table 1

Mass/g Force/N Initial Position

Final Position

Extension/cm

050

100150200250

DATA ANALYSIS 2. Draw a graph of extension against force.Student will get full marks if the graph includes such criteria1) Title of the graph 2) Right labels on Y/X- axis 3) Right scales 4)Correct Points 5) Most perfect best-fit line

DISCUSSION According to Hooke’s Law, the force applied is proportional to the extension. F α x

F = kxThe manipulated variable is the force and a graph of extension against force is plotted. What is the value of spring constant, k obtained from the graph?………………………………..