Physics Forces help, 10 pts!?

Question

A skier is sliding down a 15 degree slope. Friction is not negligible.Identify the forces on the skier. Static friction Normal force Kinetic frictionTension Thrust Weight Select all that apply

Everardo Feil · Accepted Answer

Kinetic Friction, Normal Force, and Weight.Friction is not negligible, so your options are either static or kinetic friction. You know the skiier is moving, so that must mean kinetic friction.There is always normal force acting upon any given object, unless otherwise stated. The normal force, keep in mind, is coming out of the plane at an angle, not going straight upwards. Weight is a result of gravity acting upon the skiier, going straight through the plane perpendicular to the ground. There is no tension because there are no strings or ropes on the skiier, static friction is invalid as stated already, and thrust may or may not be negligible in this case. If you’re in a 101-level introductory class, my bet is that you can disregard it in this case. You’ll get into thrust more as you continue to take physics courses.It helps to draw a free body diagram and think about all the forces logically, on a piece of paper in front of you. Good luck!

Everardo Feil · Answer

Normal Force, Kinetic friction, and Weight.Weight is present presumably because gravity is pulling the skier down.Normal Force is present to counteract the effect of the skier’s weight on the ski slope, following Newton’s third law.Kinetic friction is present because the skier and the slope are moving relative to each other, and the friction is non-negligible.

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Physics Forces help, 10 pts!?

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