Agrocery cart with a mass of 20 kg is pushed at constant speed along an aisle by a force f = 12 n. the applied force acts at a 20° angle to the horizontal.

find the work done by each of the forces on the cart if the aisle is 18 m long.

Explanation:

Given

mass of cart m=20 kg

Force applied F=12 N at angle of with horizontal

Force can be resolved in two components i.e. and

is will act Perpendicular to the motion of cart and will help to move the cart .

Since cart is moving with constant velocity therefore net force is zero on the cart as friction is opposing the

Work done by is

Work done by Friction will be same but in Opposite Direction

Work done by  is

because direction of force and motion is Perpendicular to each other.              

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.