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For a ball moving on a smooth frictionless surface, choose the appropriate option that will make the following statements physically correct.
(i) If no net force is applied on the ball, the velocity of the ball will remain the same/increase/decrease.
(ii) If a net force is applied on the ball in the direction of its motion, the magnitude of the velocity of the ball will remain the same/increase/decrease.
(iii) If a net force is applied on the ball in a direction opposite to the direction of its motion, the magnitude of the velocity of the ball will remain the same/increase/decrease.
(i) If no net force is applied on the ball, the velocity of the ball will remain the same/increase/decrease.
(ii) If a net force is applied on the ball in the direction of its motion, the magnitude of the velocity of the ball will remain the same/increase/decrease.
(iii) If a net force is applied on the ball in a direction opposite to the direction of its motion, the magnitude of the velocity of the ball will remain the same/increase/decrease.
View Answer
(i) Remain the same — with no net force, velocity does not change (first law).
(ii) Increase — a force along the motion speeds the ball up.
(iii) Decrease — a force opposing the motion slows the ball down.
| Case | Net force | Velocity of the ball |
|---|---|---|
| (i) no net force applied | zero | remains the same (first law) |
| (ii) force along the motion | forward | increases — speeding up |
| (iii) force opposite the motion | backward | decreases — slowing down |
