when force applied= frictional force
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when we apply a force on wall or when we try to move a truck by applying force but we cannot
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If both forces are equal,then the object is at rest or moving at a constant velocity. There is no acceleration.
For the object to start moving or accelerate, the applied force MUST always be greater than the frictional force. The larger the difference the greater the INITIAL ACCELERATION. (Remember that resistance to motion is the square of velocity. That is why the maximum speed of cars is limited).
Where some of the answers are wrong here is that they don't understand the meaning of the Force used in the formula Force = Mass x Acceleration. This force is NOT the force required to balance the resistance at rest or in motion. It is the additional force that is needed to move the object. Let's call this initial additional force P and the friction opposing force F which changes with motion.
P will continue to accelerate the object until the increase in resistance to motion causes it to drop to zero. That does not mean there is no more force applied to the object. F is still there, though increased in value and the object moves at a constant velocity.
In the formula above, when the object is not accelerating does not mean that the applied force becomes zero and the object can still move. ONLY P, the accelerating force, becomes zero. There is still the resistance balancing force, F, and momentum keeping it moving at a constant velocity until a change in resistance is encountered
For the object to start moving or accelerate, the applied force MUST always be greater than the frictional force. The larger the difference the greater the INITIAL ACCELERATION. (Remember that resistance to motion is the square of velocity. That is why the maximum speed of cars is limited).
Where some of the answers are wrong here is that they don't understand the meaning of the Force used in the formula Force = Mass x Acceleration. This force is NOT the force required to balance the resistance at rest or in motion. It is the additional force that is needed to move the object. Let's call this initial additional force P and the friction opposing force F which changes with motion.
P will continue to accelerate the object until the increase in resistance to motion causes it to drop to zero. That does not mean there is no more force applied to the object. F is still there, though increased in value and the object moves at a constant velocity.
In the formula above, when the object is not accelerating does not mean that the applied force becomes zero and the object can still move. ONLY P, the accelerating force, becomes zero. There is still the resistance balancing force, F, and momentum keeping it moving at a constant velocity until a change in resistance is encountered
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