Problem: A) An object cannot remain at rest unless which of the following holds?a) The net force acting on it is zero.b) The net force acting on it is constant and nonzero. c) There are no forces at all acting on it.d) There is only one force acting on it. B) If a block is moving to the left at a constant velocity, what can one conclude? a) There is exactly one force applied to the block.b) The net force applied to the block is directed to the left.c) The net force applied to the block is zero.d) There must be no forces at all applied to the block.C) A block of mass 2kg is acted upon by two forces: 3N (directed to the left) and 4N (directed to the right). What can you say about the block's motion?a) It must be moving to the left.b) It must be moving to the right.c) It must be at rest. d) It could be moving to the left, moving to the right, or be instantaneously at rest. D) A massive block is being pulled along a horizontal frictionless surface by a constant horizontal force. The block must be __________. a) continuously changing directionb) moving at a constant velocityc) moving with a constant nonzero accelerationd) moving with continuously increasing accelerationE) Two forces, of magnitude 4N and 10N, are applied to an object. The relative direction of the forces is unknown. The net force acting on the object __________. Check all that apply.a) cannot have a magnitude equal to 5N b) cannot have a magnitude equal to 10N c) cannot have the same direction as the force with magnitude 10Nd) must have a magnitude greater than 10N

FREE Expert Solution

A) Newton's first law of motion states that an object continues in its state of rest or uniform motion unless acted upon by a net external force. Therefore, an object will not remain at rest when a net force greater than zero acts on it. The question has two negatives, (cannot, unless). Therefore, the correct answer should be the opposite of the blue highlight. 

a) The net force acting on it is zero.

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Problem Details

A) An object cannot remain at rest unless which of the following holds?

a) The net force acting on it is zero.

b) The net force acting on it is constant and nonzero. 

c) There are no forces at all acting on it.

d) There is only one force acting on it. 


B) If a block is moving to the left at a constant velocity, what can one conclude? 

a) There is exactly one force applied to the block.

b) The net force applied to the block is directed to the left.

c) The net force applied to the block is zero.

d) There must be no forces at all applied to the block.


C) A block of mass 2kg is acted upon by two forces: 3N (directed to the left) and 4N (directed to the right). What can you say about the block's motion?

a) It must be moving to the left.

b) It must be moving to the right.

c) It must be at rest. 

d) It could be moving to the left, moving to the right, or be instantaneously at rest. 


D) A massive block is being pulled along a horizontal frictionless surface by a constant horizontal force. The block must be __________. 

a) continuously changing direction

b) moving at a constant velocity

c) moving with a constant nonzero acceleration

d) moving with continuously increasing acceleration


E) Two forces, of magnitude 4N and 10N, are applied to an object. The relative direction of the forces is unknown. The net force acting on the object __________. Check all that apply.

a) cannot have a magnitude equal to 5N 

b) cannot have a magnitude equal to 10N 

c) cannot have the same direction as the force with magnitude 10N

d) must have a magnitude greater than 10N