Physics
Out of the following, which statement does not relate to Newton's laws of motion?
- If a body A exerts a force on body B, then body B exerts an equal and opposite force on body A.
- The force needed to produce a given acceleration in a body is inversely proportional to the mass of the body.
- The rate of change of momentum of a body is directly proportional to the external force acting on the body and takes place in the direction of the force.
- A body continues in a state of rest or of uniform motion in a straight line unless acted upon by an external force.
Motion in One Dimension
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Answer
The force needed to produce a given acceleration in a body is inversely proportional to the mass of the body.
Reason — From Newton’s second law of motion,
Here, force is directly proportional to both mass and acceleration so if acceleration is constant then force is directly proportional to mass, not inversely.
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