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Newtons Laws of Motion
The three laws proposed by Sir Isaac Newton to define the concept of a force and describe motion, used as the basis of classical mechanics.
1,508 Questions
How does Newtons second law relate to speedometers?
Newton's second law states that the acceleration of an object is directly proportional to the force acting on it and inversely proportional to its mass. In the context of a speedometer, this means that the force applied to the vehicle's wheels by the engine will determine the acceleration, which in turn affects the speed displayed on the speedometer. More force results in greater acceleration and faster speeds displayed on the speedometer.
Simply because physicists discovered that it is a product that is conserved.
In collisions of two objects for example, if you add up the momentum before the collision the momentum will be the same after the collision.
Note that momentum is not something that has a concrete reality.
A rock sitting on the ground has zero momentum relative to us here on earth but has alot of momentum relative to someone on mars. It can not have zero momentum and alot of momentum at the same time, it depends on ones frame of reference. My point is that momentum is not at 'concrete" thing.
Refer to the 'Conservation of linear momentum' in Wikipedia.org, "The World's Encyclopedia"
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What term is used to describe the difference in duration of large and small arcs of a pendulum?
The term used to describe the difference in duration of large and small arcs of a pendulum is called "isochronism." It refers to the property of a pendulum where its period of oscillation remains constant regardless of the size of the swing.
True or false the greater the surface area of an object the greater the air resistance?
True. Air resistance is proportional to surface area, with larger surface areas creating more drag as the object moves through the air. This can result in the object experiencing greater resistance and slowing down.
Before you step off of the train, your body is moving past the walkway at the same speed as the train.
Its natural tendency is to keep moving in the same direction at the same speed, but once you step onto the walkway, that means your body wants to move along the walkway at the speed of the train. You have to slow your body down gradually, which you can only do by deftly manipulating the contact between the walkway and your feet.
If you stepped off and expected to just stand there, your feet might stay on the walkway, but the rest of you still needs to keep going at the speed of the train, resulting in a phenomenon known as "falling down".
If the 2 forces are equal and opposite direction can you cancel the acceleration Why?
Yes, if two forces are equal in magnitude and opposite in direction, they will cancel each other out. As a result, there will be no net force acting on the object, and according to Newton's second law (F=ma), with no net force, there will be no acceleration of the object.
What is a sentence for centripetal?
If you mean centripetal force,
I was surprised when I saw that the water was not spilled when it was swung around in a circle, but then I learned that centripetal force kept it inside.
If you lift a 20 N book to a height of 0.5m how much potential energy does the book have?
The potential energy of an object raised above the ground is given by the formula PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height. Assuming the book has a mass of 2 kg (20 N ÷ 9.81 m/s^2), the potential energy would be PE = 2 kg × 9.81 m/s^2 × 0.5 m = 9.81 J.
What is proof of the ehrenfest's thereom?
Statement:The ensemble average behavior of a wave function resembles that of a classical particle.
Proof:
We have followed the mathematical formulation governed by Schrodinger's picture
(a)(1)
Last term in above equation vanishes, since does not depend upon explicitly. From (a) and its complex conjugate, (1) can be written as (2)
Let's evaluate the second integral in the square brackets of (2). (3)
According to divergence theorem, LHS of (3) is nothing but surface integral of the quantity in parentheses. (4)
Since the volume integral is being evaluated over entire space, the wave function is presumed to vanish at large distances and so does LHS of (4). Thus, (5)
This makes (2) to look like (6)
Once again, the quantity in square brackets of (6) can be simplified as (7)
Using end result of (7) in (6), (8)
Let's now calculate the time derivative of expectation x - component of momentum: (9)
Invoking Schrodinger's equation (a) and its complex conjugate again, (9) proceeds as follows: (10)
First integral has two terms. It turns out that second term of the integral cancels first. This can be seen below - (11)
or (12)
LHS of (12) vanishes due to the same argument as given for (4). Thus, (13)
Hence first step of (10) and (13) suggest that the first integral in (10) vanishes. Moreover we obtain a rather simplified form of (10) that proves Ehrenfest's theorem:
What is Change in momentum times time?
Impulse = [(change in momentum)/time]*time
[(change in momentum)/time] = Force
And when force acts for a period of time, that impulse changes the momentum of the object.
You can also rewrite the impulse equation as: I = F*t
However, for change in momentum times time, the units would be (kg*m/s)*(s) = kg*m. These units are not in common usage.
Is testing carpet cleaners a good science fair project?
Yes, testing carpet cleaners can be a good science fair project as it involves designing experiments, collecting data, and analyzing results. You can evaluate the effectiveness of different cleaners, their impact on stains, or their eco-friendliness. Make sure to follow proper safety precautions and document your process accurately.
Rolling friction is the resistance encountered by an object when it rolls over a surface. It is typically less than sliding friction because the object's shape allows for smoother movement. Rolling friction occurs between the object and the surface it is rolling on.
Advantages of tunneling electron microscope over conventional microscopes?
Tunneling electron microscopes offer higher resolution imaging capabilities due to their ability to achieve atomic-scale resolution. They also provide information about the electronic structure of materials by measuring the tunneling current between the sample and the tip. Additionally, tunneling electron microscopes can operate in a vacuum environment, allowing for imaging of delicate or sensitive samples without interference from air molecules.
The maximum force of static friction acting on the sled is 147.15 N (50 kg x 9.81 m/s^2 x 0.30). Once the force exceeds this value, the sled will start moving. Once the sled is in motion, the force of sliding friction acting on it will be 49.05 N (50 kg x 9.81 m/s^2 x 0.10).
How can you prove inertia exist?
Inertia exist because of the Law of Motion of Sir Isaac Newton states that " bodies at rest will remain at rest and objects in motion will continue moving at constant speed in a straight line unless acted upon a net force.
If a ball is rolled off a ramp how do you tell how far it will go before it hits the floor?
say ramp angle = 30deg from horizontal, launch velocity = 10 m/s, launch point is 1m above floor
break launch velocity vector into horizontal and vertical components
horizontal = cos 30 * 10 = 8.66 m/s, vertical = sin 30 * 10 = 0.5*10=5 m/s
the horizontal component is constant so if you multiply the time the ball spends going up and down by 8.66 this represents horizontal travel
take g as -10 m/s^2, u=5, v=0 ,s=?, t=?
find height reached and time taken, t=v-u/g = 0.5secs, s=(u*t)+((g*t^2)/2)=1.25m, now add how long to fall 1.25 m+ original height (1m) = 2.25m
remember g is now +10 m/s^2, u=0, s=2.25m ,t=?
then t= sq root(s*2/10)=0.671secs(falling), add to 0.5 secs(rising) = 1.171secs, multiply by 8.66m/s then horizontal travel = 10.14 metres
What is a nickname for the first law of motion?
Newton's first law is sometimes called the law of inertia.
mass = 1.9 kg
distance (s) = 0.825 metres
time (t) = 0.4 seconds
initial velocity (u) = 0 metres/sec
to find acceleration (a)
shuffle s = ( u * t ) + ( 0.5 * a * t^2 ) to isolate a
a = s - ( u * t ) / ( 0.5 * t^2 )
a = ( 0.825-0 ) / ( 0.5 * 0.16 )
a = 0.825 / 0.08
a = 10.3125 ( m / s ) / s
force required to give 1.9 kg mass an acceleration of 10.3125 ( m / s ) / s
f = m * a
f = 1.9 * 10.3125
f = 19.59 newtons
If the box is sliding along at a constant speed, the net force acting on the box is zero.
If the net force was not zero, the box would either be speeding up or slowing down.
Non-zero net forces acting on objects cause the objects to accelerate. Therefore, if the net forces is not zero, the velocity of the object could not be constant.
In the angular momentum equasion what does the lower case omega mean?
The lower case omega (ω) represents angular velocity in the angular momentum equation. It is a measure of how quickly an object is rotating around an axis and is typically measured in radians per second.
If you apply a fixed number of newtons on an object over time does it accelerate?
It depends on whether the force is unbalanced against another. If so, then yes; it will accelerate according to the formula F = ma or a = F/m. Note that force does not accumulate - applying one newton every minute for ten minutes is not the same as applying ten newtons for one minute.
How is momentum conserved after a collision?
Completely
If you add all the energy of all the resultants of the collision together, you will arrive at the same value as the sum of the energies of all the components before the collision.
How does newton's first law affect soccer?
newton's first law effects soccer because if you kick the ball it will keep moving until acted on by another force.it also effects this sport because the layers will keep moving until they are acted on by another force
How to Derive newtons first law from second law?
The derivation is as follows:
Consider an isolated system of two bodies A and B. An isolated system is such that no force acts on the system.
This is the Newton's third law of motion for a body exerting some force on another.
Hope it is clear!
Best wishes!!
The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.
To put it as it is often put:
Force equals mass times acceleration (F = ma): the net force on an object is equal to the mass of the object multiplied by its acceleration.
