If you have a single pulley, then you would need to exert 100N + an amount to overcome friction in your pulley.
If you have 2 pulleys, rope connected to a beam at top, descends through pulley on item lifted, and back up through pulley at the top and then down to where you are pulling. Then the force is split in half and you would exert 50N + an amount to overcome friction.
If you connect a rope to the item, up through a double pulley, down through a pulley on the item, and back up through the double pulley again and down to the person who is pulling. Then you divide the force into thirds, and the force is 33.3N + an amount to overcome friction.
Essentially count the upward pulling ropes and divide by that number. A rope simply looping over a pulley that you're hanging onto the other end of only counts as once, and would be no different from you pulling up directly on the object, or on a pulley connected to the object.
F=mg
because they love each other
Capillary actioncapillary action. - apex
soil erosion
A TENSION FORCE is pulling one end of of an object and and the other end of an object in opposite directions.ex. playing tug of war O - PERSON 1 X - PERSON 2O Xrope
Some do and some don't. In the case of someone sitting on a chair, they exert a downward force on the chair due to their weight. The chair exerts an equal and opposite reaction force on them but, since this upward force acting on the person is equal to their weight, the net force is zero and the person does not accelerate. However, consider now if the person pushed themselves up off the chair with their hands. They are now exerting an additional force on the chair with their arms along with the force due to their weight. The chair will exert a reaction force on the person that is equal and opposite to the combined downward force due to the person's weight and their arms pushing. Since it is equal to the weight plus the pushing force of the arms, it will be greater than the downward force on the person due to their weight and a net upward force will be produced, accelerating the person upwards.
No matter how much force you exert downward, it shall avail you naught. No downward force acting directly on the object can ever succeed in lifting it.
downward
in which situation you exert more force downward, standing or lying horizantilly?
When you stand on a floor, the force that you exert on the floor because of your weight is equal to the force with which the floor supports your weight.
downward force
The force that a human body can exert on a surfboard is its weight. Weight is the gravitational force acting on a body's mass, and is determined by multiplying the acceleration due to gravity (g), 9.81m/s2, times the person's mass in kilograms. The unit for weight is the Newton (N). For example, if a person has a mass of 75.5kg, his weight in Newtons will be 75.5kg x 9.81m/s2 = 741N.
If you sit on it, you push downward. The bicycle seat naturally pushes back up - if this wasn't the case, you would accelerate downward, due to the force of gravity.
gravity
You exert a force of 30 N.
The force would be the weight of the object.
In the opposite direction, and on the other object. In this case, the chair pushes upward against the person.