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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Laws of Motion
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Consider a cart on a horizontal friction-less surface. Once the cart has been given a push and released, what will happen to the cart?

(A) slowly come to a stop
(B) continue with constant velocity
(C) continue with constant acceleration
(D) continue with decreasing acceleration
Can you answer this question?

1 Answer

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  • Newton's first law states that when viewed in an inertial reference frame, an object either remains at rest or continues to move at a constant velocity, unless acted upon by an external force.
Answer: continue with constant velocity.
Newton's first law states that motion requires no force.
After the cart is released, there is no longer a force in the x-direction. The cart will continue continue moving with the same velocity it had at the moment of release.
The initial push got the cart moving, but that force is not needed to keep the cart in motion.
This is because of Newton's first law which states that an object in motion continues to move at constant velocity in the absence of external forces.
answered Aug 19, 2014 by balaji.thirumalai
edited Aug 19, 2014 by balaji.thirumalai

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