1. Complete the following table using measurements from the Phet virtual lab. Use the "Stretch" virtual lab. (Gr is the green mass.) Use g = 10 N/kg [6]

No.	Mass, m	Weight (Force) F / N	Extension
/g	/kg	e/cm	e/m
1	0	0	0	0	0
2	50	0.05	200	9	0.09
3	100	0.1	100	17	0.17
4	250	0.25	40	42	0.42
Gr	Gr	Gr	Gr

2. (a) On the graph paper below, plot a graph of force F (weight, W) vs. extension, e,

using SI units. [6]

F/N 0
0 e/m

(b) According to Hooke's Law, the graph of force vs. extension graph for a spiral spring is usually linear (a straight line passing through the origin). Was your graph linear?____________________________________________ [ 2 ]

(c) Were there any anomalous results? If so, identify one and give

your reason for calling it anomalous. ___________________________________

_________________________________________________________________

__________________________________________________________________

If no anomalous results, give your reason for saying so_____________________

__________________________________________________________________

__________________________________________________________________

[3]

(d) Describe ONE source of experimental error.____________________________

___________________________________________________________________

___________________________________________________________ [2]

3. For the green object

(a) what was the extension that corresponded to its weight? _________________

(b) the weight of the green object? ___________ (you will need to use the graph for this)

(c) the mass of the green object _____________________(show your calculation of the mass) below.