12. Suppose you exert a horizontal push on a crate that rests on a level floor, and it doesn’t move. How much friction acts compared with your push?
13. As you increase your push, will friction on the crate increase also?
14. Once the crate is sliding, how hard do you push to keep it moving at constant velocity?
15. What is meant by free fall?
16. Why doesn’t a heavy object accelerate more than a light object when both are freely falling?
17. The ratio of circumference/diameter for all circles is pi. What is the ratio of force/mass for freely-falling bodies?
18. What two principal factors affect the force of air resistance on a falling object?
19. What is the acceleration of a falling object that has reached its terminal velocity?
20. If two objects of the same size fall through air at different speeds, which encounters the greater air resistance?
2006-09-24 05:50:50 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Once again, you want help with ALL of this?
2006-09-24 05:53:07 · answer #1 · answered by FlashGordon 3 · 3⤊ 1⤋
12. Enough static friction to equal your push and prevent the crate from moving.
13. Yes, but only until you reach the maximum amount for static friction.
14. This would depend on the coefficient of kinetic friction: if this number were .1 the the answer would be .1 times the normal weight of the crate.
15. Falling freely in a gravitational field: free from any other forces besides gravity.
16. Because a large object requires more force to accelerate at the same rate as a light object--and the gravitational field provides just this extra amount of force.
17. Gravity:9.8 in metric and 32 in American
18.The shape of an object and its density.
19. 0 because it has stopped accelerating
20. The one going faster
2006-09-24 06:06:14 · answer #2 · answered by bruinfan 7 · 1⤊ 0⤋
12) -equal and opposite
13)-yes
14)- equal to the friction of the two bodies
15)- when an object travells parrell to the direction of gravity and has an initial velocity=0.
16)- the acceleration due to gravity is the same for all bodies since it only acts at center of gravity
17)- acceleration
18)- velocity of wind, shape of the object
19)-zero
20)-the slower one
2006-09-24 06:01:50 · answer #3 · answered by Akshay p 2 · 0⤊ 0⤋
12 mone
13if it move
14 u have have the weight and how hard it is to move 15 it fall free no jumb or and thing to hold it back
2006-09-24 06:04:34 · answer #4 · answered by rnd1938 3 · 0⤊ 0⤋