Young modulus closes strain to stress and then stress to force. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Young modulus closes a strain-to-stress-to-force chain
First multiply modulus 12 Pa by strain 1 over 2 to get stress 6 Pa. Then multiply by area 2 square meters to get force 12 N. The accepted bit stays pinned to the cited sources.
σ=Eϵ=12Pa×21=6Pa,F=σA=12N,accepted=1
Young modulus closes a strain-to-stress-to-force chain
First multiply modulus 15 Pa by strain 1 over 3 to get stress 5 Pa. Then multiply by area 4 square meters to get force 20 N. The accepted bit stays pinned to the cited sources.
σ=Eϵ=15Pa×31=5Pa,F=σA=20N,accepted=1
Young modulus closes a strain-to-stress-to-force chain
First multiply modulus 20 Pa by strain 1 over 4 to get stress 5 Pa. Then multiply by area 6 square meters to get force 30 N. The accepted bit stays pinned to the cited sources.