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Statics
Statics is the branch of mechanics that describes bodies which are acted upon by balanced forces and torques so that they remain at rest or in uniform motion. In statics, the bodies being studied are in equilibrium.
434 Questions
What is the decrease in weight caused by the upward force of displaced fluid?
It is named after Archimedes of Syracuse, who first discovered this law. According to Archimedes' Principle, "any body fully or partially submerged in a fluid is buoyed up by a force equal to the weight of the fluid displaced." When a body is fully immersed the weight of fluid displaced is equal to the volume of the body times the density of the fluid. So this amount will be the reduction in apparent weight of the body. If the body is floating, its apparent weight is reduced to zero, so the weight of fluid displaced must equal the weight of the body. In this case only part of the volume of the body needs to be immersed to displace its weight in fluid, because the body has a lower density than the fluid.
What item has the lowest friction?
Ice has the lowest friction of common surfaces due to its smooth and slippery surface.
How fast will a puck slide off a table if the table is 5 ft tall and the puck slides at 2ms?
Neglecting friction, if a puck is sliding at 2 m/s it will still be sliding at 2 m/s when it slides off the table. Immediately before hitting the floor, its velocity in the x-direction will still be 2 m/s but it will have accelerated to a y-velocity of approximately 6.4 m/s, yielding a total speed of 6.6 m/s.
Solids liquids and gases. which ones are hard to deform?
When we talk about deformatation, we are referring to two properties, namely Elasticity and Plasticity. These properties are measured using constants known as " Moduli of Elasticity". There are 4 such moduli: Young's Modulus Axial Modulus Rigidity Modulus Bulk Modulus The larger the value of the Bulk Modulus, the harder it is to compress the material.
Static is caused by the buildup of electrical charges on the surface of an object, usually due to friction between two surfaces. When these charges accumulate, they can discharge as a spark, leading to the familiar crackling sound and potential electric shock. Dry air and certain materials, such as plastics and synthetic fabrics, can contribute to static buildup.
Hooke's law states that the force needed to extend or compress a spring by a certain amount is proportional to that amount. Mathematically, it can be expressed as F = kx, where F is the force applied to the spring, k is the spring constant, and x is the displacement from the equilibrium position.
To minimize tire wear, the static friction force between the tires and the road should be maximized. This can be achieved by increasing the angle of banking of the curve. The banked angle should be adjusted so that the centripetal force required to keep the car moving in a circle is provided mostly by the static friction force rather than the normal force.
The system that you describe is said to be statically indeterminate since, there are more than 2 wires (minimum required to support the cement bag with inclined support).
There are three unknowns in the system that is the tensile forces in the wires. You should use three equations as follows to solve this.
- Vertical equilibrium: Sum of vertical components of tension in all wires is equal to the weight of 380N
- Horizontal equilibrium: Sum of horizontal components of tension in all wires add to zer
- Compatibility condition: The vertical component of elongation of all wires is the same.
Formulate the three equations and solve the algebraic equation to get the tension in each wire.
Draw a free body diagram for the moon?
If you mean the Moon's movement around the Earth, the Earth's gravitation pulls the Moon towards the Earth. There is no opposing force that acts on the Moon (otherwise, the Moon wouldn't accelerate towards the Earth, i.e., change its direction).
A horizontal bar is fixed to the wall at one of the ends What is the torque at the fixation point?
The reaction at the fixation point(let's mark it 'A' point) will consist of reaction force and reaction torque.
The net force for static item, consisting of sum of all the forces and the net torque have both to equal zero.
To calculate force and torque at the fixation point, we need to know two things: mass of the bar and horizontal displacement of bar's center of mass from the fixation point.
Since there are no forces acting in the horizontal plane, we can only take z(height) axis into consideration for forces.
Reaction plus force of gravity have to be zero:
RA + Q = 0, where
Q denotes weight and is equal to Q = m * g, where m is mass of the bar.
Calculated,
RA = -Q,
which means that reaction force is equal to weight, but directed in opposite way.
Sum of all the torques in the bar has to be zero:
MA + Q * l = 0, where
MA is reaction torque at the fixation point,
Q as above
and l is distance from fixation point to bar's center of mass.
Calculated:
MA = -Q * l
What is eqiulibrium of concurrent force system?
A concurrent force is a force that acts through the same point. When it is in equilibrium all the forces are balanced so there is no net or overall force.
In fact, Newton's first law leads to the definition of inertia & equilibrium. when state of object does not change with time , we say the body is in equilibrium . According to the first law for equilibrium there must be zero force on the object.
Give an example of two surfaces that would have a low coefficient of friction?
Friction is the static electricity of two things that are rubbed against each other. Ice would have a low coefficient of friction, as things could easily slide across it. This would also make sense for something like marble, which is very smooth.
How can you test your static strength?
You can test your static strength by performing exercises like the plank, wall sit, or static holds with weights. These exercises require you to hold a position for a period of time, challenging your muscles to generate force without movement. Tracking how long you can maintain these positions can help you gauge your static strength.
The angle of internal friction is a measure of the resistance of a material to shear stress. It represents the maximum angle at which a material can be stable without collapsing or flowing. It is an important parameter in geotechnical engineering for analyzing soil behavior under different loading conditions.
Advantages and disadvantage of friction?
Advantages of friction
1. It enables us to walk with out slipping. To enhance friction, it is advisable to use shoes with rough sole while walking on slippery floors. For a similar reason, crutches are provided with rubber tips at their bottom to provide sufficient friction.
2. The breakers and tiers of our cars and bicycles depend on friction to function properly.
3. The ridges in the skin of our fingers and palms enable us to grasp and hold objects due tofriction.
4. To prevent patients being uncomfortable in bed rubber sheets with spongy under surfacesare placed over mattresses. The friction between the spongy under surfaces and the mattress prevents the rubber sheet from slipping and wrinkling.
5. Nails and screws are held in wood by friction.
6.High resistance in storage.
7.A horse can pull a cart unless friction furnishes him a secure foothold.
Disadvantages of Friction
1. Production of heat, noise and wear in machine parts rubbing against one another.
2. Heat produce by friction may be sufficient to cause the abrasion of the skin, resulting in friction burn. Rubber tubes such as gastric and duodenal tubes, rectal tubes and catheters may burn or irritate the membrane over which they pass unless measure are taken to prevent friction.
3. Friction reduces the efficiency of engine and other machines.
4.due to friction,engines of auto mobiles consume more fuel which is a money loss.
Static Dimensions are dimensions taken when the body is in a fixed (static) position. They consist of skeletal dimensions (between the centers of joints, such as between the elbow and the wrist) or of counter dimensions (skin surface dimensions such as head circumference. Many different body features can be, and have been, measured.
In an experiment do the variables always change?
In an experiment, the variable that is being manipulated (independent variable) is intentionally changed by the researcher to observe its effect on another variable (dependent variable). Other variables, known as control variables, are kept constant to ensure that any observed changes are due to the manipulated variable.
What is the variable setup in an experiment called?
The variable setup in an experiment is called the experimental design. This design includes all the factors and conditions that are manipulated or controlled in the experiment to test the research hypothesis.
What are the advantages and disadvantages of friction?
Advantages of Friction
In some situations, friction is very important and beneficial. There are many things that you could not do without the force of friction.
- Walking: You could not walk without the friction between your shoes and the ground. As you try to step forward, you push your foot backward. Friction holds your shoe to the ground, allowing you to walk.
- Writing: Writing with a pencil requires friction. You could not hold a pencil in your hand without friction. It would slip out when you tried to hold it to write. A pencil eraser uses friction to rub off mistakes written in pencil lead. Rubbing the eraser on the lead wears out the eraser due to friction, while the particles worn off gather up the pencil lead from the paper.
- Driving car: Your car would not start moving if it wasn't for the friction of the tires against the street. With no friction, the tires would just spin. Likewise, you could not stop without the friction of the brakes and the tires.
- Friction Pen: Inventors have invented useful items like the friction pen/highlighter. You are able to erase the pen/highlighter mark. The problem is that the rubber at the back gets dirty easily.
- There wouldn't be a Universe without friction.
Disadvantages of Friction
Friction can cause problems or be a nuisance that you try to minimize.
- Makes movement difficult: Any time you want to move an object, friction can make the job more difficult. Excess friction can make it difficult to slide a box across the floor, ride a bicycle or walk through deep snow. An automobile would not move forward very well unless its friction was not reduced. Oil is needed to lubricate the engine and allow its parts to move easily. Oil and ball bearings are also used in the wheels, so they will turn with little friction.
- Wastes energy: In any type of vehicles as a car, boat or airplane--excess friction means that extra fuel must be used to power the vehicle. In other words, fuel or energy is being wasted because of the friction. Fluid friction or air resistance can greatly reduce the gas mileage in an automobile.
- Heats parts: The Law of Conservation of Energy states that the amount of energy remains constant. Thus, the energy that is "lost" to friction in trying to move an object is really turned to heat energy. You've seen how people will try to start a fire by vigorously rubbing two sticks together. Or perhaps you've seen an automobile spin its wheels so much that the tires start to smoke. These are examples of friction creating heat energy. Just rub your hands together to create the same effect. Besides the problem of losing energy to heat, there is also the threat of a part overheating due to friction. This can cause damage to a machine.
- Wears things out: Any device that has moving parts can wear out rapidly due to friction. Lubrication is used not only to allow parts to move easier but also to prevent them from wearing out. Some other examples of materials wearing out due to friction include the soles of your shoes and a pencil eraser.
- Carpet burn is because of friction.
Compromise
A compromise is needed between too much friction and not enough.
For example, if you wanted to slide a heavy box across the floor, you would want to reduce the friction between the box and the floor, so that it would be easy to move. Lubrication of some sort is often a way to reduce friction.
Friction is necessary in many applications to prevent slipping or sliding. But also, it can be a nuisance because it can hinder motion. A good compromise is necessary to get just enough friction or a proper combination of frictions
Tempered water is water that has been heated or cooled to a specific temperature range to make it suitable for various applications, such as mixing with hot water to achieve a desired temperature or preventing scalding. Tempering water helps ensure safety and comfort in scenarios where precise water temperature control is important.
When air bubbles rises in water its volume increases what happens to its mass and density?
The mass of the air bubbles remains the same as they rise in water, but their density decreases. This is because as the volume of the air bubbles increases, they displace more water, causing their density to decrease relative to the surrounding water.
Velocity ratio is the ratio of the distance moved by the effort to the distance moved by the load in a simple machine. It represents the trade-off between force and distance in a machine. A higher velocity ratio indicates that the machine can move the load a greater distance with a smaller input force.
Yes, friction is useful because it helps to provide traction for walking and driving, prevents objects from sliding off each other, and allows us to grip objects. However, excessive friction can also lead to wear and tear on surfaces.
What are the three dimensional planes?
The three-dimensional planes are the XY plane (horizontal plane), the YZ plane (vertical plane), and the XZ plane (lateral plane). These planes intersect at the origin in three-dimensional space and provide a framework for locating points and objects.
