Ramps >> How Things Work: An Introduction to Physics
TOTAL POINTS 10
1.You are in an ordinary room (both its floor and ceiling are horizontal). You throw a ball directly upward and it bounces off the ceiling. While the ball is touching the ceiling, in which direction is the ceiling’s support force on the ball?
1 point
2.You are playing volleyball and your teammate has just hit the ball forward — toward your opponents. To increase the ball’s forward speed, you push it with a forward force of 200 newton (45 pounds-force). What force, if any, does the ball exert on you?
1 point
3.When you stand and remain motionless on a bathroom scale, what force is the scale exerting on your feet?
1 point
4.As a ball bounces on the floor, the floor exerts an upward support force on the ball. Can the amount of that upward support force on the ball be different from the ball’s weight?
1 point
5.You are using a string to lift a heavy picnic basket up to your treehouse. Alas, the string isn’t strong enough for the job. The picnic basket becomes motionless, even though you are moving the portion of string you are holding upward, and the string breaks. Breaking the string required energy and that energy was provided by
1 point
6.You are shopping in a store and want to go upward from the second floor to the third floor. You can make that trip using an escalator, an elevator, or a staircase. Which method of going from the second floor to the third floor will increase your gravitational potential energy the most?
1 point
7.A downhill skier is descending a snow-covered mountain. The skier steps off of a level region of the mountain and onto a steep slope. The skier begins to accelerate rapidly downhill on the slope. What force is causing the skier to accelerate downhill?
1 point
8.You have shopping cart full of groceries and that cart is on a ramp. You are exerting an uphill force on the cart, so that the net force on the cart is zero. What energy transfer is occurring?
1 point
9.You are trying to lift a heavy file cabinet into the back of a truck. The file cabinet weighs 200 pounds (about 900 newtons) and you must raise it 2 feet (about 0.6 meters) upward. The file cabinet has wheels, so it rolls freely. You create a ramp using rigid boards that are 8 feet long and successfully push the wheeled file cabinet up the ramp and into the truck. What force did you exert on the file cabinet to keep it moving up the ramp at constant velocity? [Assume the ramp was smooth, straight, and exactly 8 feet long, and neglect any imperfections, such as friction, air resistance, or rotation of the cabinet’s wheels.]
1 point
10.You talking on your cellphone and you accidentally ride your bicycle off the road. You realize that you are going to collide with either a tree or a garbage can, so you must choose which object to hit. The tree will not move at all (exactly zero distance, which is an idealization) if you hit the tree, but the garbage can will move if you hit the garbage can. How will your choice of object affect the energy you transfer to that object when you hit it? [Fortunately, you are going slowly, so you won’t be injured regardless of your choice.]
1 point
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