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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
Why does a large spring constant indicate a stiff spring?
It takes a larger force to compress or pull a spring the same distance as a spring with a smaller spring constant. This is shown in Hooke's law.
x=F/k
k---is the spring constant
F---is the force applied to the spring
x is the distance the spring has been compressed
What advantages do parametric equations have instead of numeric values?
Parametric equations not only give a more general solution to a problem, but they also display the relationship between the parameters, thus providing a better understanding of the what the solution suggests.
When velocity is negative and acceleration is zero what happen the object in the motion?
It accelerates in the opposite direction. Its velocity increases in the opposite direction to the direction that has been assigned positive.
The vertical distance between the release point and the ground.
How many forces make up the net force?
However many there are exerted on the object. Usually there is gravity, friction, and another force exerted on the object.
What is the formula for Net Force?
The net force on an object is simply the vector sum of all forces that act on an object. For more information, do some reading about "vector sum".
How does amplitude affect sound?
Amplitude decides the intensity (loudness) of the sound. Intensity is directly proportional to the square of the amplitude of vibration.
Can a vector with a non zero component be zero?
No. The answer does assume that "components" are defined in the usual sense - that is, a decomposition of the vector along a set of orthogonal axes.
Why do balanced forces always have a net force of 0?
When forces are in equilibrium, the net force is always zero. This is because each and every force in every direction balances out.
For example, a person is hanging by a harness from a rock climbing course. He is stationary (not moving). This means his weight force of 780N is equal to the force the rope and harness has (-780N - due to opposite direction).
780N + -780N = 0N (Hence the net force is zero).
Alternatively, you can use F = ma (Newton's Second Law) to show this problem.
Fnet = ma
= 78kg x 0ms-2
= 0N (hence the net force is zero.
What is the significance of hysteresis?
Hysteresis is the delay between an observed outcome and the quantity of change applied.
When a ferromagnetic material is magnetized in one direction, it will not relax back to zero magnetization when the imposed magnetizing field is removed. It must be driven back to zero by a field in the opposite direction. If an alternating magnetic field is applied to the material, its magnetization will trace out a loop called ahysteresis loop. The lack of retraceability of the magnetization curve is the property called hysteresis and it is related to the existence of magnetic domains in the material. Once the magnetic domains are reoriented, it takes some energy to turn them back again. This property of ferrromagnetic materials is useful as a magnetic "memory". Some compositions of ferromagnetic materials will retain an imposed magnetization indefinitely and are useful as "permanent magnets". The magnetic memory aspects of iron and chromium oxides make them useful in audiotape recording and for the magnetic storage of data on computer disks.
Variations in Hysteresis Curves
There is considerable variation in the hysteresis of different magnetic materials.
What is the importance of newtons laws of motion to road safety?
Slowing (negative acceleration) to stop, or slow to keep out of an accident. Forces to change direction, particularly on slick roads.
If you are moving at 10 knot what is the conversion to miles per hour?
10 Knots = 11.507794 MPH If 1 knot = 1.1507794 mph, then 10 X 1.1507794 = 11.507794
What equations describe centripetal acceleration?
You can do the following. Make a diagram to illustrate the initial velocity at a certain position, and the velocity after a short time, delta-t. Calculate the change of velocity (delta-v) during that time. Divide delta-v by delta-x to get the acceleration. Finally, calculate the limit as delta-t tends toward zero - that is, figure out what happens when delta-t gets smaller and smaller.
A dimensionless number which is a ratio of kinematics viscosity to thermal?
The ratio between the kinematic viscosity and the thermal diffusivity is called the Prandtl Number.
Mass X Acceleration is used to calculate what?
Force
----------------------------------------------
The above is correct Force = mass * acceleration
but note that momentum = mass * velocity
6 x 40 = 240 miles
How does adhesion and cohesion affect each other?
Adhesion is where water molecules stick to other things, and cohesion is where the water molecules stick to each other. The combination of this makes it so that together, they can climb up things like roots of a tree to give the tree water.
When the proton is at location A what are the magnitude and direction of the parallel component?
d|p|/dt * p^ = d(mv)/dt = (magnitude) = 0
and the direction = Zero magnitude
As frequency increases the energy of a wave increases or decreases?
As frequency increases the energy of a wave also increases.
Tendency to stay at rest or stay moving?
The tendency of a body to remain at rest or motion is called INERTIA. It is accounted in Newton's first law of motion saying force is required to remove inertia from a body
If something has a change in motion it has what?
For any object to change its motion, it must be accelerated and experiences acceleration. Note that a change in motion is a change in velocity. The object either speeds up, slows down or changes direction, and one of those or some combination is a velocity change. Only acceleration will change velocity. We need to offer the reminder that velocity is speed with a direction vector attached to it. An object can travel at a constant speed and be changing direction. This is a change in velocity because of the change of direction. And a change in velocity is, as stated, initiated by acceleration.
How does your credit card get erased?
A credit card is a piece of plastic with a strip of magnetic information on it. When this strip is exposed to a strong magnetic field, like in an MRI, PET scan, or CAT scan it can get erased because the magnetic field removes the magnetic information.
Is the hip joint an example of a first class lever?
Hip joint act as both first class lever and third class lever, as per which work we are doing and which muscles are working on hip for that particular work.
When we stand in single leg, then force exerted by hip abductor muscles is "power " and neck of femur is "power arm"; centre of femoral head is "fulcrum"; and body weight is "load" and centre of head of femur to symphysis pubis is "load arm". So here hip joint work as first class lever.
But when we do straight leg raising (SLR), then "power" is exerted mostly by the hip flexor muscles [comprise the psoas major (PM), iliacus (IL), rectus femoris (RF), sartorius (SAR), adductor longus (AL), and tensor fasciae latae (TFL)] in between hip joint and knee joint (here length "power arm" is different for different muscles, but we can assume that "power arm" is hip joint to knee joint. Here "load" is weight of leg and "load arm" is hip joint to foot. So in this case, hip joint work as third class lever.
Can a gun be fired under water?
Yes a gun can be fired under water.
You can look it up on youtube the're plenty of videos showing it.
