which pulley changes the direction of force
A fixed pulley allows the direction of the applied force to be varied. It does not change the load.
A single pulley system is used to change direction of the pulling force line.
Why are pulley force multipliers? Pulley are force multipliers because they expand the distance over which it operates.
A pulley directs the force in a rope into a new direction.
I am not sure what you mean by "a surface that re-directs force" but you could use a pulley to redirect a force from a rope.
which pulley changes the direction of force
One single fixed pulley cannot give any mechanical advantage. It can only redirect the direction of the applied force.
A fixed pulley allows the direction of the applied force to be varied. It does not change the load.
A rope winds around the pulley so that two ropes hang downwards. Using one side of the rope to apply force causes the pulley to rotate and redirect the force, moving the load upwards even though the pull is applied downwards.
A Pulley is basically a kind of lever that can be used to change the direction of a force. Properly used, a pulley or system of pulleys can multiply forces
no
A Pulley is basically a kind of lever that can be used to change the direction of a force. Properly used, a pulley or system of pulleys can multiply forces
A single pulley system is used to change direction of the pulling force line.
Why are pulley force multipliers? Pulley are force multipliers because they expand the distance over which it operates.
force applied to a pulley
A pulley directs the force in a rope into a new direction.