Newtonovi zakoni gibanja - Univerza v Novi Gorici
Newtonovi zakoni gibanja - Univerza v Novi Gorici
Newtonovi zakoni gibanja - Univerza v Novi Gorici
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5. A 100kg crate is pushed at constant speed up a frictionless 30 ◦ ramp. (a) What horizontal force<br />
F is required? (b) What force is exerted by the ramp on the crate?<br />
6. A 52kg circus performer is to slide down a rope that will snap if the tension exceeds 425N<br />
(a) What happens if the performer hangs stationary on the rope? (b) At what magnitude of<br />
acceleration does the performer just avoid breaking the rope?<br />
7. A 5kg block is pulled along a horizontal frictionless floor by a cord that exerts a force F = 12N<br />
at an angle α = 25 ◦ above the horizontal. (a) What is the acceleration of the block? (b) The<br />
force F is slowly increased. What is its value before the block is lifted (completely) off the floor?<br />
(c) What is the acceleration of the block just before it is lifted (completely) off the floor?<br />
2<br />
F
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