Please solve

Period 4 Exercises: Forces Write answers to the questions below. Show your mathematical steps. and the units of the quantities. This sheet with your answers should be turned in at the beginning 0 _ Period 5. ' 1. Understanding net force: Do the vehicles described below experience a net force? a) a roller coaster car accelerates as it goes down a steep track b) a train moves at a constant speed on a straight, level track c) a race car goes around a circular track at a constant speed i, 2. calculating frictional force: A box is at rest on a rough surface. When you push the box with a constant force of 12 newtons, the velocity of the box increases by 2 meters/sec each second. a) Draw arrows on the box to show the horizontal forces acting on it. Label these forces. .l b) The mass of the box is 4 kilograms. How large is the net force on the box when the box is moving? c) What is the frictional force between the box and the rough surface? 3. Calculating the coefficient of friction: A force of 18 newtons is required to move a 30 newton box across a level table at a constant speed. What is the coefcient of friction between the box and the table