When a net force acts on an object, we observe that the object accelerates:
(i) opposite to the direction of force, with acceleration proportional to the force acting on the object.
(ii) opposite to the direction of force, with acceleration proportional to the mass of the object.
(iii) in the direction of force, with acceleration inversely proportional to the force acting on the object.
(iv) in the direction of force, with acceleration proportional to the force acting on the object.
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- Newton's second law says the object accelerates in the direction of the net force, so options (i) and (ii) are out.
- It also says the acceleration is proportional to the net force, not inversely proportional, so option (iii) is out.
- Answer: (iv)