Learning Task No. 1: Identify the situation if it shows balanced or unbalanced force. Write your answer in your notebook. CO 1. pulling a rope 2. standing still However, there is another force that acts on the ball along the horizontal line or along the force that makes the ball in motion. This is called friction force (Ff). Friction is a force that acts between surfaces that are in contact with one another. Friction in general acts opposite the direction of motion. In the case of the rolling ball, the frictional force acts between the surface of the ball and the table and slows down the motion of the ball. As the ball rolls to the right as shown in the illustration friction acts to the left to delay its motion. Since no one did push the ball continuously there is no force present to balance the force of friction so the ball slowed down and eventually stopped. 3. tug of war Ff Again because of the unbalanced force, the object changes its state of motion, so you can say that it accelerates. Take note of this, acceleration is not just an increase in velocity, but also a decrease in velocity. דיז 4. sky diving Forces acting on a rolling ball