It is the energy stored in a body due to its shape and position.

The screw is one of the six (or seven) Aristotelian 'Simple Machines' that enable humans to do work by redirecting or focusing force.

A screw is a fastener.

Forces might be described as contact and non-contact forces.

Contact forces would include friction, pressure, etc.

Non-contact forces are more basic and include gravitational force, electromagnetic force, electro-weak force, and others.

Friction is really molecular (atomic) cohesion. There is a technical term, but being that memory isn't what it used to be, call it "stiction" (sticky + friction) and we'll be good. There are basically three ways to minimize friction. One is construction, fabrication or devices. (You choose.) Use ball bearings instead of non-moving metal-to-metal contact. Use materials that are less sticky, like teflon and such. The second way is lubrication. No explanation necessary. The last is method or technique. Use a method that distributes the friction over time. Instead of dragging both the boxes, drag one at a time. It doesn't reduce friction, but it reduces the need for large amounts of power for one evolution. Surf to the Wikipedia article, read the article and then come back here and carve this up to make a real answer. (No, I won't mind.)

reduce

shelbyjohnson

In physics a number known as the 'coefficient of friction' is used to calculate the frictional force between any two surfaces. Ff=µFn, Meaning that the frictional force (Ff) is equal to the coefficient of friction (µ) multiplied by the normal force (Fn).

If one wishes to calculate the coefficient of friction for two objects, you can pull an object of whatever material you wish along a floor of whatever material you wish. As long as the object remains at a constant speed, the force which you use to pull the object (which can be measured by a force meter) is equal to the frictional force. Once you find the normal force (to find the normal multiply the mass of the object by the acceleration due to gravity on your part of the world, Fn= mg) you simply divide the frictional force by the normal force and you have the coefficient of friction.

or just ask your teacher lol

70kph = 43.496 miles per hour.

It means that acceleration is constant.

This meaning that velocity is varying with respect to time, we see this by this formula (v - v(initial) ) / t (Time).

Yes and no. The dual stage compressor runs louder (usually), but it takes less time to fill and keep the tank at optimum pressure (recovery time), the dual stage is also the more expensive.

The size air compressor should be determined by the amount of air and/or size or number of tools you will be using at the same time.

Basically by acting as a brake for the bouncing movement. Shocks consists of pistons moving in an oil filled cylinder. As the piston moves, the oil has to squeeze past from one side of the piston to another,which slows the movement down.

Static friction is the friction the object must be able to overcome in order to move. I'm sure you've noticed that you have to work hard to get an object to move, but once its moving, it is easier to push it. That is because static friction is greater that kinetic friction.

area is scalar.because we will not say that your area in this direction and my area in this direction . so,area has only magnitude

Answer2: the product of two displacements produce a vector area, AxB this is a vector area. BxA is an opposite area.

A way to designate momentum is using P. You can simply write Pi=Pf. If you have multiple particles, use P1i, P2i, etc.

When the Earth is traveling, everything on the Earth is traveling with it, in the same frame of reference.

For example, when you are in a car or an airplane and you flip a coin in the air, the coin doesn't shoot backwards. Or, notice that when you jump upwards that the Earth didn't move from under you when you jumped.

Newton-Meters

Divide the speed of sound by the wavelength, to get the frequency. The period is the reciprocal of the frequency.

The speed of sound in air is about 343 meters/second, but it depends on temperature. The speed of sound in other materials is quite different from the speed of sound in air.

Yes, cars have less friction when they roll on the ground than when the breaks are on (sliding). That's why breaks stop the car, because the sliding friction of rubber on asphalt is very high.

In a simple case of lifting a weight using a pulley, there are two ways to do it and two different results.

First, attach a pulley to the ceiling, and a rope to the weight which is on the floor. Run the rope through the pulley. Now we simply pull down on the rope and the weight is lifted up.

In the second case, we attach one end of the rope to the ceiling, the pulley to the weight, and pass the unattached end of the rope through the pulley. Now we have to pull the rope up, and the weight is lifted.

Now let's look at each job and what happens.

In the first case, pull the rope tight without lifting and hold the rope at the top, next to the pulley. If you now pull the rope all the way down to the floor, the weight goes all the way up to the ceiling. Note also that the tension in the rope is equal to the weight being lifted and that there is only one tensioned rope pulling the weight upwards. Passing over the pulley changes the direction of the tension in the rope but doesn't change it's pulling power. Pulling that rope from ceiling to floor is exactly the same as lifting the weight from floor to ceiling.

In the second case, tighten the rope before lifting and hold the rope where it exits the pulley on the weight. Now pull and your hand moves from there to the ceiling - about the same distance (but the other way) as you moved your hand in the other case. However, notice now that the weight is only half way to the ceiling. It is hanging on a loop of rope, one side going to the hook and the other going to your hand. This suggests that the weight is shared by these two parts of the rope and therefore the tension in each piece only needs to be half the weight. Your hand is holding half the weight. The ceiling hook is still holding the other half.

To finish the job, you will have to keep pulling more rope - all the rope which is still there from hook to weight pulley and back to your hand. That's the floor to ceiling distance. In the second case, you pull twice as much rope to finish the job.

And because it takes twice as long, it only needs half the force at any stage.

Mechanical waves are waves that require a medium in which to travel, i.e., a solid or fluid. As sound needs a medium to travel, sound is a mechanical wave.

The spring constant is a measure of stiffness - the ability to resist displacement under a load. It is denoted by K where

F = kx where f = load force and x = displacement

Mass times gravity is weight. The units for weight are: -newton (N) which is equivalent to kg*m/s^2 -kilogram-force (kgf or kp as kilopond) which is eqivalent to force by which an object with mass of 1 kg is pulled in area, where gravitational acceleration is 9.80665 m/s2 1 kgf equals 9.80665 newtons.

Forces that are equal in size but opposite in direction are called balanced forces.