An object of mass m = 4.95 kg, attached to a spring scale, rests on a frictionle

Question

An object of mass m = 4.95 kg, attached to a spring scale, rests on a frictionless, horizontal surface as in the figure below. The spring scale, attached to the front end of a boxcar, reads zero when the car is at rest. (a) Determine the acceleration of the car if the spring scale has a constant reading of 17.7 N when the car is in motion. m/s^2 to the right (b) What constant reading will the spring scale show if the car moves with constant velocity? N (c) Describe the forces on the object as observed by someone in the car. This answer has not been graded yet. (d) Describe the forces on the object as observed by someone at rest outside the car.

Explanation / Answer

Here,

m = 4.95 Kg

a)

for spring scale rating , F = 17.7 N

let the acceleration of car is a

as F = m * a

17.7 = 4.95 * a

a = 3.58 m/s^2

the acceleration of the car is 3.58 m/s^2 to the right

b)

when the car is moving with constant velocity
a = 0

as F= m * a

F = 0 N

the reading on the spring scale is 0 N

c)

for the someone in the car ,

there is a pseudo force acting on the mass ,

the magnitude of pseudo force is given as

F = m * a

d)

for someone outide the car ,

the when the spring will apply a force that will accelerate the mass

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