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.
Related Questions
Why is it necessary to wear seat belts while driving according to Newton's law of motion?
- To increase the inertia of the passenger.
- To balance the action and reaction forces acting between the passenger and car.
- To prevent passengers from being thrown forward due to their inertia when the car stops suddenly.
- To increase the momentum of passengers during a collision by applying an external force.
A student is riding a bicycle on a level road. Apply Newton's third law of motion and identify the force which is equal and opposite to the backward push of the rear wheel on the road.
- The force exerted by him on pedals.
- The resistance of the air and force of friction.
- The forward push of the road on the rear wheel.
- all of the above.
State Newton’s third law of motion.
Name and state the action and reaction in the following cases —
(a) firing a bullet from a gun,
(b) hammering a nail,
(c) a book lying on a table,
(d) a moving rocket,
(e) a person walking on the floor,
(f) a moving train colliding with a stationary train.