- Introduction Balanced & unbalanced force
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Fill in the following blank with suitable word
When a stationary car starts suddenly, the passengers are jerked …………………..
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.
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.
What type of forces – balanced or unbalanced – act on a rubber ball when we press it between our hands ? What effect is produced in the ball ?
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 shape of the object. What is the general name of the forces such as (a) X, and (b) Y ?
Fill in the following blanks with suitable words :
If there were no unbalanced force of……………….. and no…………………. resistance, a moving bicycle would go on moving for ever.
Which of the two, balanced forces or unbalanced forces, can change the shape of an object ? Give an example to illustrate your answer.
What is the usual name of the forces which cannot produce motion in a body but only change its shape ?
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 ?
State whether the following statement is true or false :
Unbalanced forces acting on a body change its shape.
Give reason for the following :
When a hanging carpet is beaten with a stick, the dust particles start coming out of it.
What do you understand by the terms “balanced forces” and “unbalanced forces” ? Explain with examples.
Fill in the following blank with suitable word:
When a running car stops suddenly, the passengers are jerked …………………..