Advertisements
Advertisements
Question
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.
Advertisements
Solution
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.
RELATED QUESTIONS
Fill in the following blank with suitable word :
When a stationary car starts suddenly, the passengers are jerked …………………..
State the various effects of force.
What happens to the passengers travelling in a bus when the bus takes a sharp turn ? Give reasons for your answer.
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?
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 :
If we release a magnet held in our hand, it falls to the ground. The force which makes the magnet fall down is an example of :
Which of the following effect cannot be produced by an unbalanced force acting on a body?
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.
