Year 7 Science
Weight and Tension
When an object is hung from a spring, the downward force called w_________ which
causes the spring to e_________. The spring exerts an upward force called t_________
which holds the object up.
In this experiment, we will be investigating the effect of adding masses to a spring and
to predict the mass of an unknown object.
A. Procedure:
1. Measure and record the original length of an
unstretched spring. (when no mass is attached)
2. Hang it from a retort stand and clamp.
3. Attach a 100 g mass on the spring. Measure and
record the length of the stretched spring.
4. Repeat step 3 by increasing the mass by 100 g
each time until 1000 g.
5. Hang the plasticine block from the spring and
record the length of the stretched spring.
B. Table of results
(note: 100 g = 1 N)
Mass (g)
0
100
200
300
400
500
600
700
800
900
1000
Force (N)
Length of spring
(cm)
Length of spring when the plasticine block is hung from the spring = ________
cm
C. Graph
Plot a graph of length of spring (y-axis) against force (x-axis). Draw a line of best
fit.
D. Analysis
1. Using the graph, predict the mass of the plasticine block.
______________________________________________________________
______