Physics: Simple Machines and Relativity

Which simple machine is represented by a screw?

In a sailboat there is a compound pulley to raise a sail (like a flag on a flagpole.) Using the K'nex pulley, we pulled the string a _____________ distance than the “sail” was raised, making it ___________ to raise the sail.

In science, work refers to the use of __________ to move a load (object) through a distance. (hint- Work=____ x distance)

For gears, we made a K’nex crank fan. There were 2 gears: the driver gear (which was connected to the hand crank) and the driven gear (which was connected to the fan.) Which set-up with the gears made the fan go the fastest?

Which simple machine is represented by a see-saw?

Which simple machine is represented by a hammer?

The mathematical calculation that tells how much easier a simple machine has made work is called ___________ advantage.

Simple Machines make work easier by spreading the effort needed over a longer distance, thereby requiring less __________ .

In a simple machine, the word “__________” refers to the force that is applied to one part of the machine in order to do work.

Special relativity says that measurement of motion depends on 2 things:

With an inclined plane, moving a load up a ramp is easier than lifting it straight up because the effort needed is less. However, the _____________ it is moved is longer.

Which simple machine is represented by a ramp?

Simple machines make __________ easier to do.

In a wheel and axle simple machine, like the Knex well that we made in class, the handle that we turned to raise the bucket was the ________ and the pole that the string was wrapped around was the ________.

True or False: In the theory of relativity, all motion can be measured against a fixed point called, “the ether.”

Using the K-nex ramp in class, we discovered that moving the object up the steeper ramp required more ___________ of force than moving the same object up a longer, less steep ramp.

For a lever, we made a K’nex balance, which acted as a simple lever, another simple machine. By moving the load (which was a paper clip with washers on it) closer to the fulcrum, we needed _________ effort (weight) to balance it.

In the early 1900’s a scientist named _________ ___________ developed the theory of relativity.

Which simple machine is represented by a bicycle?

Relativity means that details about 1 thing are considered as compared to other things. For example, the height of a 3 year old is considered _______, as compared to an infant, but _________, as compared to a 12 year old

In the wheel and axle simple machine, like the well, the larger the wheel you crank, the more distance it is for each turn of the handle, but the _____________ it will be to turn the wheel.

General relativity says time runs ___________ near a gravitational field.

What are the two types of relativity?