Velocity-time graph of an object of mass 20 g, moving along the surfac

1.	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?
Answer» From the graph Initial velocity u = 20 m/s Final velocity v = 0m/s t = 10 s m = 20 g = 20/100 kg F = ma = \(m\frac{(\text{v}-\text{u})}{t}\) = \(\frac{20}{1000}\times\frac{(0-20)}{10}\) = -0.04 N The negative sign shows that the frictional force is acting opposite to the direction of motion of the object.

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?

Answer»

From the graph

Initial velocity u = 20 m/s

Final velocity v = 0m/s

t = 10 s

m = 20

g = 20/100 kg

F = ma

= \(m\frac{(\text{v}-\text{u})}{t}\)

= \(\frac{20}{1000}\times\frac{(0-20)}{10}\)

= -0.04 N

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