I have been working on my homework and I am not totally sure about a few of the problems. Please let me know if any of these are wrong, and If anyone can point me in the right direction I would really appreciate it. Thanks(adsbygoogle = window.adsbygoogle || []).push({});

4. Doug hits his hockey puck, giving it an initial velocity of 6.0 m/s. If the coefficient of kinetic friction between ice and puck is 0.05, how far will the puck slide before stopping?

- I used the equation d= v^2 / 2gu , giving me 6^2 / (2*9.82*0.05) and came up with an answer of; 37m

5. As a basketball player starts to jump for a rebound, he moves upward faster and faster until he leaves the floor. During this time that his feet (shoes) are in contact with the floor, the force of the floor on his shoes is:

a. bigger than his weight

b. equal in magnitude and opposite in direction to his weight

c. less than his weight

d. zero

- im thinking its A; because there is extra force (more than just his weight) because he is pushing with his legs.

6. As a car skids with its wheels sliding on a road covered with ice and snow, the force of friction between the icy road and the tires will usually be:

a. greater than the weight of the car times the coefficient of the static friction

b. equal to the weight of the car times the coefficient of the static friction

c. less than the weight of the car times the coefficient of the static friction

d. greater than the weight of the car times the coefficient of the kinetic fricion

- I'm a little confused on this one, and I am not sure if it is C or D. I figure the frictional force should be less than the weight of the car, but I thought it should be kinetic and not static friction. So i cant really decide between the two, maybe because I interperated something wrong in my book.

7. A 3.0 kg bucket is being lowered by a rope into a 10m deep well, starting from the top. The tension in the rope is 9.8 N. The acceleration of the bucket will be:

a. 6.5 m/s/s downward

b. 9.8 m/w/w downward

c. zero

d. 3.3 m/s/s upward

I think its A; I got my answer by using; Net F/ m = a .giving me 19.66/ 3.0 kg = 6.5 m/s/s

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# Newtonion Physics Help

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