Machines
A device the changes the strength or direction of a force is called this.
What is a machine?
The metric base unit for distance is this.
What is the meter?
What is a fluid?
Forces at the most simple level are this.
What is a push or a pull?
The name for the force that a fluid exert on an object due to hydrostatic pressure that causes it to sink or float.
What is buoyancy force?
A machine that uses pressure from a liquid (normally water) to do work is called this.
What is a hydraulic system?
The metric base unit for force is this.
What is the Newton (kg*m/s2)?
Messy bumpy flow that does not flow is straight lines is called this.
What is turbulence?
The difference between pressure and force is this.
What is a pressure is a force divided by an area?
A hot air balloon rises for this reason.
What is the hot air is less dense than the cold air around it so is pushed up by the colder air?
A machine that uses pressurized gas to do work is called this.
What is a pneumatic system?
The metric base units (there are two possible answers) for volume is this.
Double: The relationship between these is this.
What are meters squared and Liters?
Double: What is 1000L = 1m3?
A gooey fluid like corn syrup that flows slowly is said to be this.
What is a viscous fluid?
The difference between hydrostatic and hydrodynamic pressure is this.
What is hydrostatic pressure is the pressure of all the fluid above you pushing down on you because of gravity and hydrodynamic pressure is the pressure you apply to a hydraulic or pneumatic system?
Large cargo ships often pull in ballast water while they are unloading cargo. They do it for this reason.
What is they are trying to maintain a stable density so do not float higher in the water as the cargo is removed?
The difference between theoretical and actual mechanical advantage is this.
You can determine the efficiency of a machine by doing this.
What is theoretical mechanical advantage is determined by the geometry of the machine (example the ratio of length of the distance between the load and fulcrum to the distance between effort and fulcrum on a lever arm) and actual mechanical advantage is determined by measuring the actual output and input force and taking their ratio on a real machine.
The efficiency of a machine is the ratio of the actual mechanical advantage to the theoretical mechanical advantage and is always less than 1 in real machines.
The metric base unit for mass is this and the metric base unit for weight is this. The difference between theses is this.
What is the metric base unit for mass is kilograms and the metric base unit for weight is Newtons (kg*m/s2)? The difference between these is mass is the amount of stuff something is made of and weight is the force of gravity pulling that mass down.
The difference between liquid and gas in fluid mechanics is this.
What is a liquid is non-compressible and a gas is compressible?
A piece of mining equipment exerts 800N of force over an area that is 2 m2. The pressure is this.
What is 400 Pascals (Pa)?
What is the density is the same as the fluid it is floating in?
You make a pneumatic system has to pistons connected by a tube. When the pistons are measured the input area is 3cm2 and the output area is 9cm2. When the machine is tested with a force probe the input force is 1N and the output force is 2N. The efficiency of this machine is this.
What is 2/3 or 66% efficiency?
The metric base unit for pressure is this. Its relationship to the force unit is this.
What is the pascal (Pa)? A pressure is force over an area so a Pa = N/m2.
This property of a fluid can be determined by knowing the mass and volume of that fluid.
What is density?
Hydrostatic pressure depends on these three things.
What is the acceleration of gravity, the density of the fluid, and the depth in the fluid where the measurement is taken?
If you preformed the same hydrostatic experiment on earth and on the moon where you controlled the atmospheric pressure in a jar and used water as the fluid in both cases and then saw if an object drop in the jar would float or sink. On earth you had an object sink to the middle of the jar and then hang there. When you do the same experiment on the moon the object would do this for this reason.
What is the object on the moon would float higher in the jar because there is less gravity so to keep the pressure the same it must come to a higher level in the water?