Answer :
The force required to start an object sliding across a uniform horizontal surface is larger than the force required to keep the object sliding at a constant velocity once it starts.
The magnitudes of the required forces are different in these situations because the force of kinetic friction is less than the force of static friction. (d)
The magnitudes of the required forces are different in these situations because the force of kinetic friction: D) is less than the force of static friction.
A force of kinetic friction is also referred to as sliding friction and it can be defined as the force acting between moving surfaces.
Mathematically, the force of kinetic friction is given by the formula;
Fk = μFn
Where;
- Fk represents the force of kinetic friction.
- μ represents the coefficient of friction.
- Fn represents the normal force.
A force of static friction can be defined as the frictional force that resists the relative motion of surfaces.
Hence, a force of static friction is a frictional force that keeps an object at rest or stationary instead of being in relative motion.
Mathematically, the force of static friction is given by the formula;
Fs = μFn
Where;
- Fs represents the force of static friction.
- μ represents the coefficient of friction.
- Fn represents the normal force.
In this scenario, the object is able to slide across a uniform horizontal surface because the force of kinetic friction is less than the force of static friction.
In conclusion, the object won't slide at a constant velocity because the force of static friction higher than the force of kinetic friction.
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