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Mechanics
Mechanics is the branch of physics that deals with the interactions of objects and forces in the observable world. Questions asking about projectile motion, conservation of energy, and calculus based mechanics are perfect for this topic, but questions about repairs that a mechanic would do belong in our vehicles categories.
2,416 Questions
How are balanced force and net force similar?
Both balanced force and net force refer to the overall force acting on an object. Balanced force occurs when the total force is equal in magnitude and opposite in direction, resulting in no change in an object's motion. Net force is the overall force that remains after all forces acting on an object are combined, determining its acceleration or deceleration.
What is the Difference between sound power level and sound pressure level?
Sound power or sound intensity I is a sound energy quantity.
Sound pressure p is a sound field quantity.
Sound intensity is sound pressure squared. I = p².
See related link.
What is a sewing needle made of?
A sewing needle is typically made of metal, such as stainless steel or nickel-plated steel, to provide durability and strength for sewing various fabrics. Some specialty needles may have coatings or finishes to help reduce friction and prevent rust.
Can the sum of the torques on an object be zero while the net force on the object is nonzero?
Yes. Consider an object with no torques acting on it (therefore the sum of the torques is obviously zero) but with a force directed through its center of mass.
How about a freely spinning wheel on a shaft? Would have to be in a vacuum.
Ok wait, the answer is yes. Consider a horizontal beam attached at one end that is 6 ft long. If a force (x) is applied at the end of it in the downward direction and another force is applied that is twice as powerful (2x) in the upward direction 3 ft from the attached end the net torque is zero but the net force is x in the upward direction.
Why is the volume is a scaler quantity?
Volume is a scalar quantity because it only has magnitude and no direction associated with it. It is simply a measure of the amount of space occupied by an object and does not have a specific direction in which it acts.
How do you find the net force when the forces are going in the same direction?
You add them together. If there is no other force in the opposite direction it is also recognized as zero.
Are Work And Energy Always Equal?
No, work and energy are related but not always equal. Work is a measure of the transfer of energy from one system to another, while energy is the ability to do work. In certain situations, such as when energy is transformed into different forms, work and energy may not be equal.
Strain is a dimensionless quantity that represents the deformation of an object relative to its original size. It is calculated as the change in length divided by the original length, making it unitless. This is because strain is a ratio of two lengths, and as such, it does not require a unit to quantify its value.
The energy of the electron in electron volts can be calculated by using the formula E (in electron volts) = V (volts) * e, where "e" is the elementary charge of an electron (approximately 1.6 x 10^-19 coulombs). Plugging in the values, E = 9000 V * 1.6 x 10^-19 C ≈ 1.44 x 10^-15 electron volts.
Why there are so many lines in grating?
The many lines in a grating allow it to diffract light at different angles, enabling it to separate different wavelengths of light. This makes gratings useful in spectroscopy applications where the components of light need to be analyzed. More lines increase the resolution of the grating.
Can somebody help with a question regarding the equation of continuity?
This is not the answer, but here is the question:
Oil is flowing with a speed of 1.12 m/s through a pipeline with a radius of 0.318 m How many gallons of oil (1 gal equals 3.79 10-3 m3) flow in one day?
Answer:
volume flow= sxAxday= 1.12x3.14x.3182x24x3600=30742.26613 m3/day
Gallons = 3042.26613/3.79E-3=8.111415 Million Gallons per day.
What does bus mean in electronics?
In electronics, a bus refers to a communication pathway that allows different components within a system to exchange data and information. Buses can transfer data, address information, control signals, and power between various devices such as processors, memory modules, and peripherals. A bus typically consists of multiple parallel conductors or connections that enable efficient and organized communication between components.
Could you use wood for static friction?
Wood, or any other material, could be used to introduce static friction to a system. The choice of material(s) depends on how much static friction the system requires. Each material has its unique coefficient of friction.
Why - when salt is added to water - does the freezing point decrease?
In order for water to freeze, the molecules must align themselves in an orderly fashion. When there are impurities, such as salt (but any impurity will do), they prevent the water from reaching this ordered state as easily. This requires the water to be colder before it freezes.
The salt is an impurity which when added to the ice, causes the melting point to be lowered. so if the temperature is 20 degree C, and you add salt to the ice, the melting will be lowered. It will melt faster than the one without the salt.
How many miles per minute is 18 miles per hour?
To convert 18 miles per hour to miles per minute, divide by 60 (since there are 60 minutes in an hour).
(18 \text{ miles per hour} = \frac{18}{60} = 0.3 \text{ miles per minute}).
What tool is used to measure when a liquid becomes a solid?
Eyes and sense of touch,
Ice pick.
A More Technical Perspective:
In a laboratory setting the change of state between a liquid and a solid is marked by a loss of heat energy while the temperature of the material remains the same. This is due to the energy surrendered by the material as its molecules take on a more "energy economic" configuration. As a consequence the devices need would be a thermometer to measure temperature change and a calorimeter to measure the rate of heat loss.
Alternately the freezing point could be determined by plotting temperature change (with a thermometer) with time in a constant temperature bath. The freezing point would be marked by a flat section in the graph as heat was released by crystallization rather than heat lost due to heat capacity.
How long does it take for a Delorean to reach 88 miles per hour on its oun power?
A stock DeLorean DMC-12 would take around 25-30 seconds to reach 88 miles per hour on its own power.
Decreasing the surface area in contact with the table will increase the pressure at that contact point. This can lead to an increase in the coefficient of kinetic friction, as the roughness at the microscopic level can become more significant.
How many hours equal 1098 miles at 70 miles per hour?
To calculate the time taken to cover 1098 miles at 70 miles per hour, you divide the total distance by the speed. So, 1098 miles / 70 miles per hour = approximately 15.69 hours.
How many mph equal one G force?
You can not equate miles per hour to G forces. If you were traveling at 1000 mph, for example, but at a constant speed, you would fell no extra force since you are not accelerating.
What would the world be like without friction?
Trivial Effects of a World Without The Limiting Force of Friction:
Automobiles, ships, and most aircraft would be useless: If you could ever get them moving, steering would be impossible, and stopping safely would be almost impossible. It would be worse than trying to move around on slick, wet ice everywhere. Everything would have to be tethered (tied down). It would be very difficult, or impossible, to pick up a coin from a flat surface. It would be difficult to pick up, and hold, a glass of water, and to keep from spilling it.
Without Friction, There Would Be No life.
There would be many other consequences as well, in a frictionless world. Everyone, and everything not tied down, would be sliding all over the place, including the water in our lakes, rivers and oceans. Gravity would become the defining force, and the continents would become unstable and easy prey to it. Indeed, life itself would quickly become doubtful at best, but almost certainly, impossible.
Others Have Said:
The world with no friction would be chaos. Nothing would stay where you put it. Everything would slide around. With friction, most things stay where you leave them, except things like a ball on a slope.
You would never feel the wind again. Meteorites would not slow down, liquefy, or break up before hitting Earth, so each would strike Earth's surface with greater mass, and more force than friction would allow.
Basketball would be really entertaining to watch, but not fun to play. Friction allows the players' shoes to grip the floor, and their hands to grip the ball. Without friction they'd be falling down all the time and they couldn't hang onto the ball, much less catch it.
In a frictionless world, if a ball were rolled (set in motion), it would never stop rolling. Walking or standing would be impossible. Obviously, everything concerning Earth's surface, and how we use it, would be very different.
When does is an object at zero velocity only for an instant but its acceleration is not zero?
this case is observed when you throw a ball at a wall.the ball comes to momentary rest after after striking the wall.but it experiences a retarding force.at that time the retarding force is non zero,so acceleration is non zero.but velocity is zero.same is the case when you throw an object up into air.there is constant acceleration of 9.8m/s^2 but at the top of trajectory the velocity is zero.
Is it true that the net force acting on an object is equal to the rate of change of its momentum?
Yes, that statement is a concise way of expressing Newton's second law of motion. The net force acting on an object is indeed equal to the rate of change of its momentum. This relationship helps explain how forces cause objects to accelerate or change direction.
How do you convert 55 feet per second to miles per hour?
To convert 55 feet per second to miles per hour, you would first need to convert feet to miles by dividing by 5280 (since 1 mile = 5280 feet). Then, multiply the result by 3600 (since there are 3600 seconds in an hour) to get the speed in miles per hour. In this case, 55 feet per second is approximately equal to 37.5 miles per hour.
Yes, a force acting perpendicular to a horizontal force on a body can cancel out the horizontal force if the two forces are equal in magnitude and opposite in direction. This is known as the equilibrium condition, where the net force acting on the body is zero.
