21 Consider the X axis is pointed down the inclined plane in the fipure above eq

Question

21 Consider the X axis is pointed down the inclined plane in the fipure above equation of Newton's second law on the X axis? what is the c- m.gsin(O)+f-ma 22-Consider the Y axis is pointed perpendicular to the inclined plane in the figure above what is the equation of Newton's second law on the Y axis? b- m.g.coste)-N-mg car moves with a constant velocity of 425 m/sec, the two forces acting on the car are the engine force F and the resistance force f.. What is the relation between the two forces in this case? a- F is bigger than f b- Fis smaller than f e Fequals f d- No relation 24-In a projectile motion what is the value of acceleration on the X axis? a- 9.8 b-9.8 c- Zero d- 19.6 25- The property of objects to remain in equilibrium is the base of which principal? a- Action and reaction b- The principle of inertia c- Free fall d- Time independent equation

Explanation / Answer

21. for the incline parallel to the x axis

the equation of motion in this direction is given by

mgsin(theta) - f = ma

hence option d. is the answer

22. for y axis perpendicular to the incline

newtons second law gives

N = mgcos(theta)

-mgcos(theta) + N = 0

hence option c. is the answer

23. speed of car v = 425 m/s

force on car, engine force = F, drag force = fr

as the speed is constant

F = fr

hence option c is the answer

24. in projectile motion the X axis is perpendicular to acceleration due to grtavity

hence value of acceleration in this direction is 0

hence option c. is the answer

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