Physics
Mechanical advantage of a machine is defined as : 1. Load x Effort 2. 3. Load + Effort 4.
Related Questions
For an ideal machine, the efficiency is :
- greater than unity
- less than unity
- equal to unity
- depends on the value of load
A pulley is used because it :
- has the mechanical advantage greater than one
- has 100% efficiency
- helps to apply the force in a convenient direction
- requires more effort to raise a less load.
Wheel is used with axle because :
- sliding friction is less than the rolling friction
- rolling friction is less than the sliding friction
- they work as the inclined plane
- they help us to change the direction of force.