16. If the mass of an object does not change, a constant net force on the object

Question

16. If the mass of an object does not change, a constant net force on the object produces constant? A) velocity. B) acceleration. C) both of these D) none of the above 17. A given net force propels an object along a straight-line path. If the net force were doubled, its acceleration would? A) quadruple. B) double. C) stay the same. D) be half. E) none of the above isc l toidkg blocek si pushed across a fiction-fre horizontal surfâce with a horizontal fore of 20 N. The acceleration of the block is? A) 1 m/s2, B) 2 m/s2, C) 5 m/s2 D) 10 m/s2, E) none of the above 19. Which object has zero acceleration? A) one at rest B) one moving at constant velocity C) one in mechanical equilibrium D) all of the above E) none of the above 20. A 10-kg brick and a 1-kg book are dropped in a vacuum. The acceleration of the 10-kg brick is? A) the same as that of the 1-kg book. B) 5 times as much as for the 1-kg book. C) 10 times as much as for the 1-kg book. D) zero. 21. Lillian pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration? A) 0.3 m/s2 B) 3.0 m/s2 C) 10 m/s2 D) 30 m/s2 E) 300 m/s2 22. The friction force always acts A) Same the direction to motion B) Opposite to the direction of motion C) none of the above

Explanation / Answer

16.

B) acceleration

Since, F = m *a; so for constant mass: F is directly proportional to a, which means if F is constant a will also be constant

17.

B) double

Since, F is directly proportional to a. So, doubling F will lead to doubling a.

18.

B) 2 m/s2

Since, F = m*a

so,

a = F/m

a = 20/10

a = 2 m/s2

19.

D) all of the above

Since, object is at rest, its velocity is zero. Hence, acceleration is zero

Since object is moving with constant velocity, so no change in velocity implies no acceleration, since acceleration is defined as rate of change of velocity

Since, object is in equilibrim, which means Fnet = 0 on the object. So, if net force is 0, acceleration is 0, from F = m*a.

20.

A) the same as that of 1-kg book

Since, all object fall under same acceleration due to gravity, which has a constant value 9.8 m/s2 everywhere.

So, the objects will fall under same acceleration irrespective of their masses. We can't generally see this phenomena in day to day life because of air resistance and other environment factors.

21

B) 3 m/s2

Since, a = F/m

a = 30/10

a = 3 m/s2

22.

B) opposite to the direction of motion

Since, friction always opposes motion. It'll always act in the opposite direction of motion.

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