Question | Answer |
What direction do you pull a single-fixed pulley? | down |
What direction do you pull a single-moveable pulley? | up |
What is a wheel that is attached to something above the load? | fixed pulley |
A wheel that is attached to the load is called a _________ ________. | moveable pulley |
This reduces the effort (force) needed to lift a load or overcome a resistance. | mechanical advantage |
This reduces the effort needed to lift a load or overcome a resistance. | mechanical advantage |
A change in direction of the effort that results from passing a rope through a pulley. | directional advantage |
A change in direction of the effort that results from passing a rope through a pulley. | directional advantage |
What type of pulleys change the direction of the effort? | single fixed pulleys |
These pulleys reduce the effort needed to lift a load. | single moveable pulleys |
These pulleys reduce the effort needed to lift a load. | moveable pulleys |
There are six of these. | simple machines |
In a ______________ _______________ , a reduction in effort is balanced by the distance over which the effort must act. | lever system |
________ pulleys can provide greater mechanical advantage than ____________ when lifting a load. | two
one |
The _______________ number of ropes supporting a load, the less _____________ needed to lift the load. | greater
effort |
The unit used to measure effort. | newton |
An instrument used to measure force is called a ____________ ___________. | spring scale |
What is a benefit obtained by using any simple machine? | advantage |
The effort needed to lift a load can be predicted from the weight of the load and what other thing? | number of ropes supporting the load |
The benefits gained by using a simple machine are always balanced by what? | cost |
A machine is a useful tool when the __________ outweigh the cost. | benefits |