You need to lift a piano to the third floor. Which simple machine would not work?

We do not use a number of gears in a ______________.

Which of the following is not considered as a simple machine?

The distance from (a) to (b) is 20cm, the distance (a) to (c) is 80cm, the mass at (b) is 1kg. What mass would have the block at (c)?

What is the efficiency of  a machine that requires 100J input energy to do 35J of work?

The moment of a force is called

The ratio of the work output to the work input is ______________.

A car has a 1000 kg mass. We want to move it with a machine able to multiply the force applied 8 times. Calculate the effort we have to do to move the car.

What are the two variables which determine the mechanical advantage of a simple machine?

A _____________ is a pair of equal, unlike, parallel, forces which acting on a rigid body at different points produce a turning effect in the same direction.