Question

If two children apply a force of 10 Newton each on a box in same
direction, what is the resultant force being applied by them on the box
Also name the force which opposes the change in the state of motion of
the box. *​

Answer 1

solution:-

let the box be moving in the positive x direction.

forces applied are:-

10 Newton by child (A)

10 Newton by child (B)

resultant force:-

since both the forces are along the same direction (positive x axis), we can simply sum up the magnitudes of both the forces.

$\tt\implies 10i + 10i$

$\tt\implies 20i$

I cap indicates that the direction of the resultant force is in positive x direction.

opposive forces:-

the two probable opposive forces are :-

• frictional force

• air resistance

since the force applied in direction normal will be mg,

frictional force = umg

where, u is frictional constant

m is mass of object

g is gravitational force

air resistance:-

air resistance can be neglected but it is a opposive force in the motion of the object

hope this helps!!