Part 1: Preliminary Questions Let's begin by exploring what we already know about force and motion, and how our knowledge can help us in this activity. 1. Imagine an object, a skateboarder, for example, rolling down a hill. Draw a force diagram of the skateboarder. Assume for now that there is no friction between the skateboard and the hill. You can take a picture of your force diagram with your phone and upload it using the image upload tool on the menu above your answer box. Hint: 1. the normal force on an object by a surface is always perpendicular to the surface. 2. the force of gravity is always directly downward. BIU FEE E Score: 0/52. Our goal in this activity is to explore the force that seems to pull an object down the ramp, that is, parallel to the ramp surface. But your force diagram does not have a force in this direction. Let's explore why. Notice that the force of gravity is neither parallel to, nor perpendicular to, the ramp surface. Try to add two more force vectors to your force diagram that break the force of gravity into components parallel to and perpendicular to the ramp surface. BID EEEEE 00a; Score: 0/5 3. Add second a force to your force diagram, this time directed parallel to the ramp surface but pointed up the ramp. Make the magnitude of the force such that it that would cause the skateboarder to move with constant velocity. BIEEsE 0E l'l l'l Score: 0/2 4. Use your force diagram and your previous experience with equilibrium to answer this. What is the magnitude of the component of the force of gravity that is pulling the cart downward, parallel to the ramp surface in the the situation pictured below? Ramp Forces: Parallel to R. a: H IC' iii Ill Il Il o" E] lfl Score: 0/2