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प्रश्न
What do you understand by the terms “balanced forces” and “unbalanced forces” ? Explain with examples.
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उत्तर
Balanced forces : If the resultant of all the forces acting on a body is zero, the forces are called balanced forces.
Example: When we push a concrete wall with our hands the wall doesn't move. This is because the force by us is balanced by the other forces acting on the wall.
Unbalanced force : If the resultant of all the forces acting on a body is not zero, the forces are called unbalanced force.
Example: If we push a toy car lying on the ground, we find that the toy car starts moving. This is because the force exerted by our hand is not balanced by the other forces acting on the toy car.
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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 ?
State whether the following statement is true or false :
Unbalanced forces acting on a body change its shape.
State the various effects of force.
Give one example where a force changes the speed of a moving body.
Give one example where a force changes the direction of a moving body.
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 ?
What is the unit of force ?
When a toothpaste tube is squeezed, its shape changes. The force responsible for this is an example of :
A fielder pulls his hands backwards after catching the cricket ball. This enables the fielder to :
Why does it happen?
If a stationary bus suddenly speeds up, passengers are thrown in the backward direction.
