Answer:
The given details in the question are;
The device with which the object is pulled = A spring balance
The reading on the spring balance as the object is pulled = 20 N = The force with which the object is pulled
The speed with which the object is moving = Constant speed (zero acceleration)
The net force acting on the object = Zero
The forces acting on the object are;
The force of pull and the friction force
Therefore;
The force of pull + The friction force = 0
The force of pull = 20 N
∴ 20 N + The friction force = 0
The friction force = 0 - 20 N = -20N
The magnitude of the friction force = 20 N = The force of pull
(The negative sign in the value of the friction force (-20 N), indicates that the direction of the friction force is opposite to the direction of the force of pull)
Explanation:
