Quiz- Unlt 1- Dynamies 31. A boy pushing a 20 kg lawn mower exerts a force of 10

Question

Quiz- Unlt 1- Dynamies 31. A boy pushing a 20 kg lawn mower exerts a force of 100 N along the handle. The handle is elevated 37° to the horizontal. The component of the applied force that pushes the lawn mower forward is closest to: (a) 200 N (c) 80 N 37 Total length of path travelled by an object as it moves from one position to another" is (a) displacement (b) distance (c) speed (d) acceleration (b) 100N (d) 60 N 38. Use the following diagram to answer Questions 32 and 33. The area under -graph is used to construct the corresponding position-time graph. (a) acceleration-time (b) velocity-time (c) acceleration-velocity (d) velocity-position An object attached to a string is rotated in a vertical circle of radiusB r with a constant speed v. 32. 39. At what point in the object's flight path does the maximum tension in the string occur? (a) A (c) C The slope of graph is used to construct the corresponding velocity-time graph (a) acceleration-time (b) position-time (c) acceleration-velocity (d) velocity-position (b) B (d) D 33. If the radius is maintained at r, but the speed of rotation is changed to 4v, by what factor will the centripetal acceleration change? (a) 2 (c) 8 40. "Quantity that has magnitude, but no direction" is a (a) scalar quantity (b) vector quantity (c) positive quantity (d) negative quantity (d) 16 34. "Force exerted by string, ropes, fibres, and cables" is a (a) friction force (b) tension force (c) normal force (d) net force 35. "Ratio of the magnitude of friction to the magnitude of the normal force" is (a) static friction (c) coefficient of friction (d) net force (b) kinetic friction 36. What represents "total displacement of an object per unit time"? (b) speed (d) acceleration (a) distance (c) velocity

Explanation / Answer

31. Fx = 100 cos37 =80 N  

Ans(C)

32. at C , T = m a + m g

33. a_c = v^2 / r

so acc. changes by 16 times.

Ans(d)

34. (b) tension force

35. (C)

36. (c)

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