Question

A 25 N force is applied to a 1.4 kg mass on level ground. If a 5 N frictional force is present between the surface and the object, what is the magnitude of the acceleration of this object?

Answer 1

Given parameters:

Force applied to the mass = 25N

Mass of the body = 1.4kg

Frictional force = 5N

Unknown:

Acceleration of the object = ?

Solution:

The net force on the object;

Fapplied - Frictional force = net force (m x a)

m is the mass of the body

a is the acceleration

Input the parameters and solve;

25 - 5 = 1.4 x a

1.4a = 20

a =
`(20)/(1.4)` = 14.3m/s²

The magnitude of the acceleration of the object is 14.3m/s²