Question

Velocity –time graph of an object of mass 20 g, moving along the surface of a long table is given below .What is the frictional force experienced by the object?
What is the frictional force experienced by the object?

Answer 1

Answer:

From the graph

Initial velocity u =20m/s

Final velocity v=0 m/s

t=10/s

m=20

g= 20/100kg

F = ma

(. v -u )

=m ------------------

t

=20 (0-20)

------- X -----------

1000 10

=-0.04 n

The negative sign shows that the frictional force is acting opposite to the direction of motion of the object .

Hope it helps.