A bear that weighs 4000 newtons grasps a vertical tree and slides down at constant velocity. What is the friction force that acts on the bear?
A crate remains at rest on a factory floor while you push on it with a horizontal force F, how big is the friction force exerted on the crate by the floor?
A parachutist, after opening the chute, finds herself gently floating downwardm no longer gaining speed. She feels the upward pull of her harness, while gravity pulls her down. Which of these two forces are greater? Or, could they be equal in magnitude?
2006-11-26 07:15:48 · 3 answers · asked by choddy 1 in Science & Mathematics ➔ Physics
Gravity is the greater, because she eventually comes to earth.
2006-11-26 07:18:05 · answer #1 · answered by Anonymous · 0⤊ 0⤋
All these problems involved balanced forces - the force pulling / pushing one way is balanced by the force in the opposite direction.
The parachutist has reached terminal velocity - just because the gravity is pulling down does not make it greater.
2006-11-26 07:44:30 · answer #2 · answered by Andy D 4 · 0⤊ 0⤋
4000 N, F, equal
In each case, velocity remains constant. Therefore, there is no unbalanced force which would cause acceleration.
2006-11-26 12:06:29 · answer #3 · answered by sojsail 7 · 0⤊ 0⤋