0
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
Which information is needed to determine the horizontal distance a projectile travels?
-- the initial horizontal speed of the projectile
-- the time it remains in flight before it hits the ground
What does m-s mean in this phrase-downward gravity field of 10 m-s2?
m/s2 means metres per second squared and it means gravity is the accelation of a body towards the centre of the earth.
Will a wider area create more friction?
Actually, contact surface area has absolutely nothing to do with friction. This is due to pressure that will equalize over any area. All that matters is the material of the two surfaces in contact.
Force = (m1)(m2)(G)/(r2)
16 = (m1)(m2)(G)/(r2)
if we double each mass, and double the distance between them as well then the eq becomes
force = (2m1)(2m2)(G)/(2r)2
force = 4(m1)(m2)(G)/4r2
force = (m1)(m2)(G)/(r2) = 16 N.
The force remains unchanged.
Explain Can there be forces acting on an object if the object is a rest?
Yes. Forces with identical value but with opposite direction will produce no displacement.
What is used to make distant things appaer near?
Telescopes,
binoculars,
Eye glasses,
Any magnifying instrument.
When a 20 kg box is lifted 5 meters above the floor How much work is done?
w=?
f=20 kg
s=5 m
w=f s
w= 20 *9.86*5
w=1000joules
What is the difference between auto and manual GEARBOXES?
Automatic and Manual gearboxes are essentially the same, except that the driver does the shifting for a manual gearbox(my personal preference), and a computer shifts for an automatic gearbox.
Name a substance other than water that exists in solid liquid and gas?
Any substance can be a liquid, solid or gas, provided it has the right amount of energy; water is the only one to naturally occur in all three states on Earth, though.
What is the expression of the power consumed by an electric appliance fed by a DC?
Power consumed by the appliance = (DC supply voltage) x (DC current)
Why do materials have different coefficient of friction?
Different materials have different coefficients of friction because the materials have different microscopic bumps and valleys which cause the friction to begin with. Coefficients of friction are constant for each material.
How does a simple machine make a hand brake work?
A simple machine uses a single applied force to do work against a single load force. Ignoring friction losses, the work done on the load is equal to the work done by the applied force. They can be used to increase the amount of the output force, at the cost of a proportional decrease in the distance moved by the force.
F = ma 12000kg X 4 m/s squared 48000 Newtons.
What is the equation for conservation of mechanical energy?
WE+WF=ΔK+ΔU
Here,
WE=0
WF=0
Hence, for
If you need more information, then see the link below.
What is the difference between static friction and limiting static friction?
When two bodies that are not moving relative to each other are in contact, the friction force acting between their surfaces is known as static friction or limiting friction. This friction force will prevent one of the bodies from moving over the other, or sliding down a slopped surface, except an applied force is greater than it.
Static friction Fs, also known as limiting friction, is the maximum friction force that is produced and which must be overcome for a body to move over, or slide down the surface of another body.
Laboratory experiment to demonstrate static friction: experiments can be carried out in the lab to show the presence of static friction on the surfaces of two unmoving bodies as follows:
Consider a body A on a plane surface, and a force is gradually and increasingly applied on it using a spring balance, as shown in the figure below.
At any instant, the friction force F between the surfaces adjusts itself to be equal and opposite to P, so that the body is in equilibrium.
As the force P is gradually increased, a point is reached when the body A is just about to move. The body is said to be in limiting equilibrium at this stage, and the value of P, which is noted by the spring balance represents the value of the maximum frictional force, which is also known as the static or limiting friction, Fs that is acting on the surfaces.
If P is increased further, beyond the static or limiting friction, the body begins to move with steady speed. The frictional force now acting is known as Kinetic Friction, also known as Sliding or Dynamic Friction, Fd. Dynamic friction is usually found to be less than static friction.
A good example of the action of static friction is at the contact between a car's tire and the ground. Even when the car is in motion, the section of the tire in contact with the ground is not actually moving (it is the wheel that is moving) relative to the ground, therefore static friction is present, and enables the car's wheel to roll on the ground without losing balance.
A moving object with no forces acting on it will?
Continue to move along its path. "An object in motion tends to stay in motion and an object at rest, tends to stay at rest."
What actually affect buoyant force?
-- volume of the object immersed in fluid
-- density of the fluid in which the object is immersed
When working with lever problems what do the variables Fr Fe Dr and De stand for?
When we work with levers, we look at the lever and at the fulcrum. There are 4 variables in the scenario, and they are the force being applied on one side of the lever, and the force being applied on the other. Then there is the distance from the fulcrum that one force is being applied, and lastly the distance from the fulcrum to where the other force is being applied. The forces are Fr and Fe, and the distances from the fulcrum are Dr and De. (We often actually use F1, F2 and D1, D2.) If everything balances out and a static (stationary) condition exists, F1 x D1 = F2 x D2. (For your variables, Fr x Dr = Fe x De.) The products of the force on one side and distance from the fulcrum on that one side equals that same thing on the other side. Simple and easy.
How does a perfume spray bottle function?
There are different kinds, but they're all essentially "atomizers" (a better term would be "misters," as they don't actually turn the liquid into individual atoms or even molecules, but they do turn it into a mist). The "pump type" sprayers are basically force pumps. They force a quantity of liquid at high pressure through a mixing baffle that breaks it into small droplets and expels them into the air. The kind with a little balloon type device that you squeeze are aspirators. They force air at high speed (and therefore low pressure, according to Bernoulli's law) over a tube with liquid at the bottom; the low pressure draws the liquid up into the tube, where it is again mixed with the high speed air and sprayed out the nozzle.
there is a opening where the perfume comes out you aim at the spot where you want the perfume and then you push down on the cap
What is mass divided by length?
Mass divided by linear displacement (length or distance) is density, often called linear density or lambda.
If no external torque acts on a body will its angular velocity remain conserved?
If Torque(τ) = 0, L=Iω=constant.
Therefore, ω will remain conserved if the moment of inertia (M.I.) of the body about a given axis of rotation remains constant.
