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प्रश्न
An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason.
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उत्तर
Yes, when the external unbalanced force on an object is zero, the object can travel at a non-zero velocity. The necessary conditions include:
- The object should already be moving at a uniform speed along a straight line.
- There should be no change in the magnitude of velocity and also no change in the direction of motion.
- The resistance to motion due to air must be zero.
- The resistance to motion due to friction between the object and the ground must be zero.
If one of the four conditions listed above is not met, the answer will be no. This is because an imbalanced external force is required to initiate the motion as well as any subsequent changes (decrease/increase) in velocity.
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संबंधित प्रश्न
What is the usual name of the forces which cannot produce motion in a body but only change its shape ?
Which of the two, balanced forces or unbalanced forces, can change the shape of an object ? Give an example to illustrate your answer.
State the various effects of force.
Give one example where a force stops a moving body.
Give one example where a force changes the direction of a moving body.
Give one example where a force changes the shape (and size) of a body.
What do you understand by the terms “balanced forces” and “unbalanced forces” ? Explain with examples.
A car is moving on a level road. If the driver turns off the engine of the car, the car’s speed decreases gradually and ultimately it comes to a stop. A student says that two forces act on the car which bring it to a stop. What could these forces be ? Which of these two forces contributes more to slow down and stop the car ?
There are two types of forces X and Y. The forces belonging to type X can produce motion in a stationary object but cannot change the shape of the object. On the other hand, forces belonging to type Y cannot produce motion in a stationary object but can change the object. What is the general name of the forces as (a) X, and (b) Y?
When we talk of a force acting on a body, it usually means :
