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How does a crow bar used to remove the top of a box change the direction of force?
How does a crowbar used to remove the top of a box change the direction of the force? By moving the handle downward you do work on the crowbar. As the crowbar moves it does work on the lid lifting the crowbar.
What is the mechanical advantage of a crowbar?
The mechanical advantage of the crowbar is 5. Given data states that there is a crowbar with 120 cm length and fulcrum of the crowbar is at 20 cm distance from the load. The crowbar is an example of lever belonging to the class I.
What is a measure of how much of the work put into a machine is changed to useful work put out by the machine?
Simple Machines
| A | B |
|---|---|
| mechanical efficiency | measure of how much of the work put into a machine is changed into useful work put out by the machine |
| friction | force that opposes work |
| power | rate at which energy is converted |
| watt | J/s |
How much work is done when a vertical force acts on an object that is moving horizontally?
Stack #160626
| Question | Answer |
|---|---|
| Horsepower is equal to | about 746 watts |
| What conditions must exist in order for a force to do work on an object? | Force and motion in same direction |
| What formula relates work and power? | power=work/time |
| How much work is done when a vertical force acts on an object moving horizontally? | Zero |
What class of lever is a crowbar?
first class levers
A teeter-totter, a car jack, and a crowbar are all examples of first class levers. First class levers are very useful for lifting large loads with little effort.
Does a crowbar change the direction of force?
How does a crowbar change the direction of force? It is a lever. Normally you would pull up to open the box. With a crowbar you are pushing down to open the box.
What is mechanical advantage and velocity of a lever?
Mechanical advantage is the ratio of load to effort of machine or we can say it is the ratio of output of machine to the input of the machine. Velocity ratio is also defined as velocity of effort to the velocity of load.
What is a sloping surface used to raise objects?
Inclined Plane: An inclined plane is a slanted surface used to raise an object. It reduces the force required to move an object by increasing the distance of movement.
Which is the force that results from the use of a machine?
The effort force is the force applied to a machine. Work input is the work done on a machine.