Newton's Second Law
A hockey puck of mass 0.16 kg resting on smooth ice is struck so that it gains a steady acceleration of 25 m/s^2. What is the magnitude of the net force applied to the puck?
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More laws of motion Practice Questions
A cricket ball of mass 0.16 kg moving horizontally is struck by a bat, and its velocity changes from...
A cricket ball of mass 0.16 kg moving horizontally is struck by a bat, and its velocity changes from...
A force of 20 N acts on a body of mass 4 kg initially at rest. What will be its velocity after 5 sec...
A force of 20 N acts on a body of mass 4 kg initially at rest. What will be its velocity after 5 sec...
A block of weight 50 N rests on a horizontal floor while an external force of 20 N is applied on it ...
A block of weight 50 N rests on a horizontal floor while an external force of 20 N is applied on it ...
A pendulum hangs from the roof of a railway carriage that is accelerating horizontally, and the stri...
A pendulum hangs from the roof of a railway carriage that is accelerating horizontally, and the stri...
The linear momentum of a moving particle varies with time according to the relation p = 8 + 6t, wher...
The linear momentum of a moving particle varies with time according to the relation p = 8 + 6t, wher...
A block placed on a rough inclined plane remains on the verge of sliding when the incline is tilted ...
A block placed on a rough inclined plane remains on the verge of sliding when the incline is tilted ...
A wooden block resting on a rough horizontal floor just begins to slide when a horizontal pull equal...
A wooden block resting on a rough horizontal floor just begins to slide when a horizontal pull equal...
A small box slides down a smooth incline that makes an angle of 30 degrees with the horizontal surfa...
A small box slides down a smooth incline that makes an angle of 30 degrees with the horizontal surfa...
Two blocks of masses 3 kg and 2 kg are connected by a light string and pulled along a smooth horizon...
Two blocks of masses 3 kg and 2 kg are connected by a light string and pulled along a smooth horizon...
A person of mass 70 kg stands on a weighing scale inside a lift that accelerates upward at 2 m/s² wh...
A person of mass 70 kg stands on a weighing scale inside a lift that accelerates upward at 2 m/s² wh...
A stone of mass 0.5 kg is whirled in a horizontal circle of radius 1 m at a constant speed of 4 m/s ...
A stone of mass 0.5 kg is whirled in a horizontal circle of radius 1 m at a constant speed of 4 m/s ...
A car negotiates a curved road of radius 100 m that is banked at an angle so that no friction is nee...
A car negotiates a curved road of radius 100 m that is banked at an angle so that no friction is nee...
About This Question
- Subject
- physics
- Chapter
- laws of motion
- Topic
- newton's second law
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
4 N
Newton's Second Law tells us that the net external force on a body equals the product of its mass and its acceleration, written as F=ma. On smooth ice the frictional resistance is negligible, so the striking force is essentially the entire net force responsible for the puck's acceleration. Substituting the given values, F=0.16×25=4 N. The value 2 N corresponds to an acceleration of only 12.5 m/s^2, half the stated figure, so it is incorrect. The value 6 N would require an acceleration of 37.5 m/s^2, which exceeds what is given. The value 8 N would correspond to doubling the true mass or acceleration and therefore cannot match the data. This is a direct application of the NCERT formulation of the Second Law for a single body on a frictionless surface. As a unit check, kilogram times metre per second squared yields the newton, and the modest 4 N magnitude is reasonable for a light puck on slippery ice.
This easy difficulty physics question is from the chapter laws of motion, covering the topic of newton's second law. It appeared in the 2025 exam.
Looking for more practice? Explore all physics questions or browse laws of motion questions on RankGuru.