A skier of mass m is sliding down a snowy slope that is inclined at an angle ∅ above the horizontal. The magnitude of the normal force on the skier is a) mg tan ∅ c) mg sin ∅ b) mg cos ∅ d) mg e) zero

A stone with mass m is thrown straight up into the air. At the top of its trajectory, the net FORCE acting on it is:A) greater than its weight (>mg). B) greater than zero, but less than its weight (<mg).C) momentarily equal to zero. D) exactly mg.

A rock is thrown vertically into the air. Ignore air resistance. At the top of its path, theacceleration acting on it is:A) increasingB) zeroC) decreasingD) a constant value (10 m/s2) To produce an acceleration to a body, thereA) May or may not be a net force acting on the bodyB) Must NOT be a net force acting on the bodyC) Must be a net force acting on the bodyD) Must be acceleration outside the body also.

10. A man pulls a box from rest with a horizontal force F across a frictionless surface a distance d. (a) If he were to repeat this process by pulling the rope at an angle of 20° above the horizontal, the final velocity of the box increases decreases stays the same Justify your answer.

Three different forces act on an object. They are: F1 - 5, – 7 > 2 = - Find the net force Fnet on the object (the sum of the forces) Fnet Find what fourth force, F, would need to be added so the object feels no force, that is, so Fnet F4 =

A 6 kg toolbox sits at rest on a roof sloped at 31 degrees. Which of the following is the magnitude of the normal force on the toolbox? - a.) 30.3 N - b.) 43.7 N - c.) 50.4 N - d.) 58.8 N

2) A 2500-kg truck accelerates from 6 to 21 m/s while entering a highway. If an average force of 4500 N was applied to the truck, how long did it take to accelerate?