What is Laws of motion: Definition and 214 Discussions
In physics, a number of noted theories of the motion of objects have developed. Among the best known are:
Classical mechanics
Newton's laws of motion
Euler's laws of motion
Cauchy's equations of motion
Kepler's laws of planetary motion
General relativity
Special relativity
Quantum mechanics
F parallel - F applied - rolling resistance = ma
I don't know how to calculate for rolling resistance. If the bicycle is not slipping rather it is rolling, should I ignore rolling resistance? And if I ignore that I would get,
F parallel - F applied = ma
F applied = F parallel -ma...
"Reversibility means that we never lose information, that at a fundamental level we can always retrodict the past as well as predict the future in the laws of physics".
Susskind in his Theoretical minimum Lecture 2 describes about the laws which are true and which are not. He tells the law of...
The question is solved in a single step by taking the blocks as a system and using conservation of linear momentum in the horizontal direction as there is no net force acting in the horizontal direction.
Conserving the momentum we get,
m x v + M x 0 = (m+M)v',
so,,v' = mv/(m +M).where v' is the...
F.B.D Of first block
(I have shown only the horizontal Forces)
f1(max) = μ (1kg)(g) = 0.5 * 10 = 5N
F.B.D Of the second Block
f2(max) = μ (3kg)(g) = 15N
Now the string will become taut and the tension will start acting when f = t = 5N
But for 0<f<5N there will be no motion between the 1 kg...
About 50 years ago, the San Diego Zoo, in California, had the largest gorilla on Earth: its mass was about 3.10 × 102 kg. Suppose a gorilla with this mass hangs from two vines, each of which makes an angle of 30.0° with the vertical. Draw a free-body diagram showing the various forces, and find...
I think you would do force of gravity= mass x acceleration
acceleration of gravity= 9.8 m/s
mass 75 kg
75kg x 9.8 m/s
=735 N
i don't know if that's right but i have no idea how to calculate it after he lands, any help would be greatly appreciated!
$$\Box A_\alpha +\mu^2 A_\alpha = 2\beta A_\mu \partial_\alpha A^\mu + \frac {4\pi}{c} J_\alpha$$
where ##A=(\Phi, \vec A)## and ##J=(\rho, \vec J)##
using a static configuration first where ##α=0##
and then a dynamic one where ##α=i##
knowing that ##E= - \nabla^2 \Phi - \frac {\partial...
The euler lagrange equation I am using is:
$$\frac {\partial^\beta \partial L}{\partial(\partial^\beta A^\alpha) }= \frac {\partial L} {\partial A^\alpha}$$ Now the proca lagrangian i am using is $$L= -\frac {1}{16\pi} F_{\alpha\beta} F^{\alpha\beta} + \frac {\mu^2} {8\pi} A_\alpha A^\alpha -...
Hello to everyone :smile:
I'd like to study this problem.
You have a 2D guide, described by an equation y = y (x) in a reference interval x ∈ I = [a, b], placed in a cartesian vertical plane Oxy.
The guide is frictionless and the only force that is acting is the gravity force.
On this track, a...
Quantum mechanics has argued for years that space is not a vacuum.
Arguments attempting to brush aside quantum mechanics vacuum theory claiming, it's 'just a quantum mathematical theory' can now put to rest.
In this article, laboratory experimentation demonstrates that the Casimir Effect can...
If it were supposed that time were a 4th non-spatial dimension how would it influence the gravitational movement ?
The problem I have when trying to solve this invented problem is that Newtonian physics works in coordinates and that there are a lot of ways to find 4d 3+1 hyperbolic-spherical...
I used work energy theorem between initial top point and point x along the incline(downwards) i got the expression of v then diffrentiated it to get a maxima but it gives me a wrong ans which is 10/6 but the actual ans is 10/3 please tell me what i did wrong
I tried making the fbd of both blocks the block on the incline will have mgsin30 friction force, tension and centrepetal force's cos component similarly second block will have mg tension and friction where normal will be centrepetal force after solving my ans is not matching
At the moment of throwing the ball the ball will have a vertical vel of 4 and horizontal of 3 wrt to elevator so as seen from inside the elevator the ball will behave like a projectile where g(eff) = 8 and with time period 1 sec hence range will be the displacement which should be 3 m but ans...
Homework Statement
How to apply constraints in the system to get a relationship between the displacements of block of mass m and pulley of mass M.?
Homework Equations
∑T.a= 0
The Attempt at a Solution
Assuming tension in both strings to be T .
-T × a1 ( for the block) + 2T × a2 ( for the...
I'm a little confused with the application of laws of motion on a man climbing a rope. Suppose a man of mass Mg is climbing a rope with an acceleration a. Rope is massless. Now if look through the frame of the piece of rope held by the man, there is a force Mg downward by man, ma downward...
Homework Statement
A gun fires bullets each of mass 1g with velocity of 10m/s by exerting a constant force of 5 g weight. Find the number of bullets fired per second (take g=10 m/s2).
Homework Equations
F=ma
M1U1 + M2U2 = M1V1 + M2V2 (conservation of linear momentum)
The Attempt at a...
Homework Statement
[/B]Homework Equations
[/B]The Attempt at a Solution
In the second question at 5:32,why doesn't the block have a spring force.In FBD of 2nd block it should have been mg-(T+kx)=ma right?
Hi,
I had a thought recently which gave rise to a rather interesting query. A helicopter works and is able to fly due to Newton's third law of motion. The propellers rotate at a high speed and exert a force on the air beneath them. By N3L, the air therefore exerts an upwards force on the...
Imagine, There's a ball in deep space traveling with a constant velocity of 25m/s and is having mass 25kg.
Now as I said, ball is traveling with a constant velocity that simply means acceleration=0 and now if we calculate the force with F=ma we will end up with 0. But if that ball collide with a...
Hello Everyone !
I am interesting to find descriptions of the series of experiments that Newton made for determining the laws of motion. In English of course.
Homework Statement
A student is cleaning a block board by moving a light duster up and down as shown. (Coefficient of friction between the duster and board is ##MU##
The duster will not move no matter how large the force is if ?
Homework Equations
No equations given
The Attempt at a Solution...
Homework Statement
Determine the speed with which block B rises in figures if the end of cord at A is pulled down with a speed of 2ms^-1
Homework Equations
Given Velocity downwards at A=2m/s
The Attempt at a Solution
Really stuck... Couldn't even start the question solving...I know all...
Homework Statement
In the situation given all surfaces are friction less pulley is ideal and steering is light. Find accn of block 2
Homework Equations
Given F=mg/2
The Attempt at a Solution .[/B]
Got answer as G/2 instead of G/4 ...(actual answer is g/4)
Since F=mg/2 and block 1 is hanging...
Homework Statement
In the following diagram a massless pulley is pulled by a constant force of magnitude P. There is no friction between the block and the floor. The acceleration produced in the block if mass m is? PIC ATTACHED
Homework Equations
Took a1/2=a2 where a1 is accn of block and a2...
When a keep two blocks one over another...And apply a foce on the block which is below...Why does the upper block falls down..Why dosent it move with A? assumin there's no friction between A and B?
Homework Statement
With the equations of motion in polar coordinates given by ##r(t)=pcos{kt^2}, φ(t)=kt^2## determine the velocity intensity of a point ##M## on the circumference of a cylinder which is rolling without friction on a horizontal plane at time ##t## is the velocity of the center...
Homework Statement
2. The attempt at a solution
Let rightward acceleration of the block (A+B) be $$a$$.
Let downward acceleration of block (A) be $$a'$$ down.
For block A:
$$mg-T=ma'$$
$$N+ma=0$$
For block B:
$$T+N=Ma$$
On solving $$N=-\dfrac{m^2g}{M+2m}$$ by taking $$a=a'$$.But...
Suppose there is a beaker filled with water placed on a weighing machine. Suppose the reading is x kg. Now, if i immerse a solid block inside the beaker without touching the walls or the bottom of the beaker, will the reading given by the weighing machine increase or not?
Suppose there is a pulley(of negligible mass) and a string(of negligible mass) passes through the groove and two equal masses are attached to each end of the string. Now, if the whole arrangement is attached on a spring balance what will be the reading of the spring balance. Will it be zero?
Homework Statement
Two cardboard boxes full of books are in contact with each other on a friction less table.Box H has twice the mass of Box G. If you push on box G with a horizontal force F, then box H will experience a net force of?
2. The attempt at a solution
Let book G's mass be = m...
Homework Statement
xg=x*(dv/dt)+v^2 is a differential equation
Which has a solution of the form v=at
Where a is a constant.Find a
Homework Equations
dv/dt=v*(dv/dx)
V=dx/dt
A=dv/dt=d^2x/dt^2The Attempt at a Solution
I assumed 'a' as a function of g
That is a=kg for some constant k
And...
Homework Statement
In order to raise a mass 'm' a man ties it to a rope and passes the rope over a friction less pulley. He climbs the rope with an acceleration 3g/2 relative to the rope. If the mass of the man is m/2 and the mass of the rope is negligible, the tension in the rope is
a) 3mg/2...
Homework Statement
Wasnt able to upload file, therefore an external link
https://drive.google.com/file/d/0B0FIIKckKOcKWFcxcmtJRVRXZTA/view?usp=drivesdk
A force F= mg is applied on C, all pullies are frictionless and we need to find the reading of the spring balance, basically the tension...
Hi, I'm a frehshman in High school writing a paper about Isaac Newton. One of my paragraphs is about the laws of motion. I came across a tidbit of information - there are instances in which Newton's laws are not correct. One example I found was that, at speeds approaching that of light, an...
can a resultant external force on a body change its mass but keep velocity of its centre of mass constant ? Is it practically possible -
##\vec{F}_{ext}=\vec{v}_{com}\frac{\mathrm{d} M}{\mathrm{d} t}##
where F is nonzero
Homework Statement
what is the value of F needed so that block begins to move upward on frictionles incline plane .
Homework EquationsThe Attempt at a Solution
i made an attemp and got the answer - Mgtan(thetta)
but the real answer is - mgtan(thetta/2)
Homework Statement
Consider a wedge of mass ##m## whose upper surface is a quarter circle and is smooth. The lower part is rough. A small block of same mass is kept at the topmost position and the initial position is shown in figure. The block slides down the wedge.
Find the minimum value of...
If anyone could tell me how to answer these questions that would be fantastic. Thank you so much!
1. A box that weighs 66.2 N on Jupiter is taken to Pluto. The weight of the box on Pluto will be ____. (acceleration on pluto is 0.42) Would you find the mass first?
2. The hand in the image...
Homework Statement
A block of mass ##M = 1 kg## is placed of a fixed rough incline of inclination
##\theta=sin^{-1} \frac{7}{10}## and coefficient of friction ##\mu=\frac{1}{\sqrt{51}}##. It is connected to a spring of spring constant 100 N/m. Initially the spring is in natural state with...
Homework Statement
A rope of uniform mass per unit length ##\lambda## and length ##L## lies curled on a table, with a short length ##\delta l## of it hanging through a hole in the table. At time zero, the rope begins to slide through the hole. At what time ##t_c## (in seconds) does the end of...
Homework Statement
[/B]
A sphere of radius $1m$ and mass $25 Kg$ is put on another sphere of radius $5 m$ and $7 Kg$ which is placed on a smooth ground. Now the upper sphere is pushed very slightly from it's equilibrium position and it begins to fall.
Now when the line joining the centre of...
Homework Statement
Two identical blocks of mass M are tied with a mass-less string of length L. If the string is pulled with a force F right at the midpoint of string L, the blocks will move towards each other. What will the velocity be when the blocks collide. The blocks start from rest and...
An open knife edge of mass 200 g is dropped from height 5 m on a cardboard. If the knife edge penetrates distance 2 m into the cardboard, the average resistance offered by the cardboard to the knife edge is:
There is this T.a rule in laws of motion which can be applied to a system to solve problems regarding constraint motion. Here's an example
This example is pretty simple so I've decided to show the application of the rule here.
Consider the FBD of m,
T is in the same direction as the...