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To move an object on a horizontal table, one needs to apply:
unbalanced force
an equal amount of perpendicular forces on the object in both upward and downward directions
balanced force
only a single force perpendicular to the object
unbalanced force
To initiate motion in a stationary object on a horizontal surface, an unbalanced force must be applied. This is because, according to Newton's first law of motion, an object will remain in a state of rest or uniform motion unless acted upon by a net external force.
To initiate motion in a stationary object on a horizontal surface, an unbalanced force must be applied. This is because, according to Newton's first law of motion, an object will remain in a state of rest or uniform motion unless acted upon by a net external force.
Think of a heavy book sitting on a desk; it stays put because the desk pushes up exactly as hard as gravity pulls down. To slide it, you must push hard enough to overcome the 'stickiness' (friction) between the book and the desk, effectively creating an 'unbalanced' situation.
FnetтАЛ=FappliedтАЛтИТfkтАЛ
FnetтАЛ=ma
When an object rests on a table, it experiences balanced forces: the gravitational force (FgтАЛ=mg) acting downward and the normal force (N) acting upward. These forces sum to zero. To move the object, one must apply an external horizontal force that exceeds the static frictional force (fsтАЛ=╬╝sтАЛN). Once the applied force overcomes this resistance, the net force becomes non-zero, resulting in acceleration as described by Newton's second law, FnetтАЛ=ma.
Balanced forces result in zero net force, meaning no change in state of motion.
Unbalanced force is required to change the state of rest or uniform motion.
Static friction opposes the initiation of motion.
Newton's First Law is often called the Law of Inertia.
Pushing a box across a floor.
Starting a car from a standstill.
Option B (equal amount of perpendicular forces) describes a state of equilibrium, which results in no motion.
Option C (balanced force) also results in equilibrium, keeping the object at rest if it started at rest.
Option D (only a single force perpendicular) would not initiate horizontal motion as it does not have a component in the direction of intended movement.
A is correct тАФ An unbalanced force is necessary to overcome static friction and accelerate an object from rest.
Remember that 'Balanced Forces' imply a state of equilibrium (velocity is constant, which includes 0), while 'Unbalanced Forces' always cause an acceleration.
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