Finding the stiffness of a spring
Answers are for parents and teachers.
1
m = 0.5 kg, Δl = 0.1 m, g = 10. k (N/m)?
50
2
F = 4 N, k = 80 N/m. Δl (cm)?
5
3
At home: hang one and two identical small loads (e.g. coins) on a rubber band or tiny spring, measure the stretch and check whether it doubles.
Roughly doubles.
4
Why mention measurement error in a lab report?
Measurements are never exact; the error shows how far the result can be trusted.
5
Of springs with k = 100 N/m and 400 N/m, which is stiffer?
The 400 N/m spring.