How does the pulley make work easier?
a
It changes the mass of the piano, making it easy to raise
b
It changes the direction of the force applied to raise the piano
c
It changes the duration of time to raise the piano
d
It changes the amount of energy needed to raise the piano
b. It changes the direction of the force applied to raise the piano.
A pulley allows you to change the direction of the force needed to lift an object. Instead of lifting an object straight up, you can use a pulley to lift it in a different direction that is easier for you to apply force. This makes it easier to lift heavy objects by reducing the amount of force needed to lift them. Additionally, pulleys can allow multiple people to work together to lift a heavy object, making the process even easier.
b
b
It changes the direction of the force applied to raise the piano.
Explanation:
A pulley is a simple machine that consists of a wheel with a groove, which holds a rope or cable. When a force is applied to one end of the rope, the pulley rotates, transferring the force to the load being lifted. As the load moves upward, the force required to lift it reduces compared to lifting the load directly.
The main advantage of a pulley is that it changes the direction of the force. Instead of lifting the load straight up against gravity, the force applied to the rope can be directed downwards or sideways, depending on how the pulley system is set up. This allows the person lifting the load to use their body weight or other mechanical advantage to counteract the force of gravity. By changing the direction of the force, the pulley reduces the effort required to lift the load.
In summary, a pulley makes work easier by changing the direction of the applied force, enabling a person to lift a load with less effort.