In this example the acceleration is caused by a friction force. A counter attendant in a diner shoves a ketchup bottle with mass 0.20kg along a smooth, level lunch counter. The bottle leaves her hand with an initial velocity of 2.8m/s. As it slides, it slows down because of the horizontal friction force exerted on it by the countertop. The bottle slides a distance of 1.0m before coming to rest. What are the magnitude and direction of the friction force acting on it? Suppose the counter attendant pushes a 0.31 kg bottle with the same initial speed on a different countertop and it travels 1.6m before stopping. What is the magnitude of the friction force from this second counter?