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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
Name the unbalanced force which slows down a moving bicycle when we stop pedalling it.
Which of the two, balanced forces or unbalanced forces, can change the shape of an object ? Give an example to illustrate your answer.
Explain why, it is dangerous to jump out of a moving bus.
State the various effects of force.
Give one example where a force moves a stationary body.
Give one example where a force changes the speed of a moving body.
A 1000 kg vehicle moving with a speed of 20 m/s is brought to rest in a distance of 50 metres :
(i) Find the acceleration.
(ii) Calculate the unbalanced force acting on the vehicle.
Give one example where a force stops a moving body .
When a toothpaste tube is squeezed, its shape changes. The force responsible for this is an example of :
A boy of mass 50 kg standing on ground exerts a force of 500 N on the ground. The force exerted by the ground on the boy will be :
