1.a . For the platform on the table, is the low-speed coefficient of kinetic fri

Question

1.a. For the platform on the table, is the low-speed coefficient of kinetic friction considerably higher than, considerably lower than, or about the same as the coefficient of static friction? (Think of this in the sense of a ratio. For example, 0.2 is twice as big as 0.1 .)

b. For the platform on the table, is the high-speed coefficient of kinetic friction considerably higher than, considerably lower than, or about the same as the low-speed coefficient of kinetic friction.

Table 1: static friction between block and table trial #1 trial #2 (block only) 1kg) trial #3 (+2 kg) trial #4 (+3 kg) trial #5 (+4 kg) trial #6 (+5 kg) force Table 2: kinetic friction (low speed) between block and table trial #1 (block only) trial #2 1 kg) trial #3 (+2 kg) trial #4 (+3 kg) trial #5 (+4 kg) trial #6 (+5 kg) 11 429N 2111N 321N A1.321N SN 8.oN N 12.ON Table 3: kinetic friction (high speed) between block and table trial #1 (block only)1 kg) trial #2 trial #3 (+2 kg) trial #4 (+3 kg) trial #5 (+4 kg) trial (+5 kg) 121N force Table 4: kinetic friction (low speed) between block and floor trial #1 (block only)+1 kg) trial #2 trial #3 (+2 kg) trial #4 (+3 kg) trial #5 (+4 kg) trial #6 (+5 kg) force Table 5: calculation of coefficients of frictlon table 3 force for 1t X' (N): force for 2d "X" (N): difference in force (N) weight for 1* x" (N) weight for 2nX(N) 14-0 N14-ON 4-8 N 2 28.ON 0.N 4,4-N11.N B.AN .4 1 ON A.ON difference in weight ON SAN 29ON4. slope- coefficient of friction:

Explanation / Answer

coefficient of friction is the ratio of force acting on the body to the normal reaction. normal reaction is the force acting in the direction of normal to the surface area.

1.from table 1, coefficient of static friction = force/weight

5/ 11. 927=0.419 , 9/21.727=0.414 ,10/31.527=0.317, 12.5/41.327=0.399, 16/51.127=0.312

average =0.419+0.414+0.317+0.399+0.312/5=0.372

2. from table 2 ,coefficient of kinetic friction for low speed

3.5/11.927=0.293, 6/21.727=0.276, 8/31.527=0.253, 9/41.327=0.217 ,12/51.127 =0.234

Average =0.293+0.276+0.253+0.217+0.234/5= 0.255

3. from table 3 , coefficient of kinetic friction for high speeds

   4.5/11.927=0.377, 6.8/21.727=0.312, 9/31.527=0.285, 10/41.327 =0.242 ,11/51.127=0.214

Average = 0.377+0.312+0.285+0.242+0.214/5=0.286

a. For the platform on the table the coefficient of static friction is considerably higher than the coefficient of kinetic friction for low speeds ( 0.372>0.255 )

b. For the platform on the table , high speed coefficient of friction (0.286 ) is about same as loe speed coefficient of kinematic friction (0.255).

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