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yes
Simple
In order to change direction, the applied force (represented as a Vector) must change DIRECTION. A change in magnitude of the Force is not necessary.
Pulleys change the direction of a force.
A first degree lever, with the fulcrum between the force and the load, will change the direction of the force. Think of an adult on the ground pushing down on a see-saw to lift a child on the other end up into the air.
yes
A straw is not a simple machine. Simple machines are mechanical devices that change the direction of a force. A straw does not redirect the direction of the force.
wheel and axle
Simple
Simple machines lets you trade force for distance, or the other way around. Or they change the direction of a force.
by simple moving of its needle,or by change the direction of needle.
In order to change direction, the applied force (represented as a Vector) must change DIRECTION. A change in magnitude of the Force is not necessary.
An axel is a simple machine that relies on change in direction to make work easier. Furthermore, a simple machine is a device that makes work easier by increasing force or changing the direction of a force without electricity or other power sources.
Pulleys change the direction of a force.
A first degree lever, with the fulcrum between the force and the load, will change the direction of the force. Think of an adult on the ground pushing down on a see-saw to lift a child on the other end up into the air.
Except first order lever, both second and third order levers will not change the direction of force. Hope I have given the right one. I am not sure about the idea behind the question.
No, a shelf support is likely a cantilevered beam, that is not a simple machine. Simple machines exploit leverage to increase or change the direction of force, a cantilevered beam merely supports a force.