Class 8 science grade 8

What is the formula for mechanical advantage

MA= force output( the force the robot has to use) divided by the Force input(the force the user has to do)

What is the mechanical advantage formula in pullies.

MA = Force Output/ Force Input

What is the mechanical advantage formula for wheel and axles?

ma= R input/ R output

what is the mechanical advantage formula if the input force is applied to the axle

ma= r axle/ r wheel

What is the formula of mechanical advantage, if the input force is applied to the wheel

ma = r wheel/ axle

what is the mechanical advantage formula in inclined planes

ma = length of ramp/ height of ramp

What is mechanical efficiency

percentage of input work that is turned into useful output work.

What is the formula for Mechanical efficiency

work output/ work input x 100%

What are the 2 types of friction, and what are they

static friction, force that prevents surfaces at rest from sliding at each other, kinetic friction, force that acts against a surface sliding against another surface

What is a fixed pulley

Does not change the amount of force applied only the direction. (MA usually 1)

What is movable pulley

it increases the output force and does not change the direction of the force (MA usually 2)

What is a block and tackle pulley

A pulley system made out of both moveable and unmoveable pulleys

In pullies when can you determine whether if the rope redirects the force, or increases the output force

Fixed pulleys are used to redirect the force, having the MA of 1 while moveable pullies don’t