Coefficients of Friction a µ s µ k Steel on steel 0.74 0.57 Aluminum on steel 0.

Question

Coefficients of Frictiona µs µk Steel on steel 0.74 0.57 Aluminum on steel 0.61 0.47 Copper on steel 0.53 0.36 Rubber on concrete 1.0 0.8 Wood on wood 0.25-0.5 0.2 Glass on glass 0.94 0.4 Waxed wood on wet snow 0.14 0.1 Waxed wood on dry snow - 0.04 Metal on metal (lubricated) 0.15 0.06 Ice on ice 0.1 0.03 Teflon on Teflon 0.04 0.04 Synovial joints in humans 0.01 0.003 a Allvalues are approximate. Coefficients of Frictiona µs µk Steel on steel 0.74 0.57 Aluminum on steel 0.61 0.47 Copper on steel 0.53 0.36 Rubber on concrete 1.0 0.8 Wood on wood 0.25-0.5 0.2 Glass on glass 0.94 0.4 Waxed wood on wet snow 0.14 0.1 Waxed wood on dry snow - 0.04 Metal on metal (lubricated) 0.15 0.06 Ice on ice 0.1 0.03 Teflon on Teflon 0.04 0.04 Synovial joints in humans 0.01 0.003 a Allvalues are approximate.

Explanation / Answer

(1)Alluminum block of mass M1=1kg copper block of mass     M2=6kg Alluminum on steel coefficient of friction1=0.47      =450  sin450=cos450=1.484 copper on steel coefficient offriction      2=0.36 Both blocks move together with a common accelaration a a=(m1+m2)gsin-1m1gcos-2m2gcos/m1+m2 a=7*9.8*1.484-0.47*1*9.8*1.484-0.36*6*9.8*1.484/7 a=46.22-3.10-14.26/7=28.86/7= 4.112m/s2 (2) Tention T=total mass/accelaration  7/4.22=1.658N

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.