A 100 kg mass is pulled along a ric onless surface by a horizontal orce F such h

Question

A 100 kg mass is pulled along a ric onless surface by a horizontal orce F such hat its acceleration s 50 m s2 A 20 g mass slides a ng the top ort e 10 m/s2. (It thus slides backward relative to the 100 kg mass.) e mass and as an acce eration of a2 Frictionless surface (a) What is the frictional force exerted by the 100 kg mass on the 20 kg mass? N--Select-#1 (b) What is the net force acting on the 100 kg mass? NI -Select- What is the force F? N (to the right) (c) After the 20 kg mass falls off the 100 kg mass, what is the acceleration of the 100 kg mass? (Assume that the force F does not change.) m/s2 (to the right)

Explanation / Answer

(a)

frictional force on 20 kg , f = 20*2 = 40 N

to the left

(b)

Fnet = 100*5 = 500 N

Fnet = F - f

500 = F - 40

F = 540 N

(c)

acceleration a = F/100 = 540/100 = 5.4 m/s^2

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