Force in motion

Force in motion

We need force in our life and motion too because there are things which needs to have force while it is moving, and if there is no force and there is motion in an object, then the object won't move. If it was the opposite the result will be the same.

What does force in motion mean?

Force means strength and power. Motion means movement. That’s why we need forces and motions in our life. We need calculation when we want to know how fast things go, travel and other things which have force and motion. ...

How do we calculate?

If you want to calculate the average speed, distance travelled or time taken you need to use this method and remember it:

$speed=\frac{distance}{timetaken}$

This is an easy method to do, you could even find the distance travelled, time taken, but at least you need to have 2 clues to find the whole answer. There are other ways of calculation but in different ways. If you want to find for any of the other two, example the distance travelled, then you will need to put the distance travelled as the subject and the time taken multiply it by he average speed, because the time taken and the average speed are always multiplying, but if you don't have the time taken or the average speed then you will have to divide the distance travelled by one of them.

What is velocity?

It is not just the speed which is important when you go on a journey. The direction matters as well, then when you want to talk about direction as well as a speed we use the word velocity. This equation for the velocity is using the distance travelled, average speed and time taken. So it will be the same.

Those two racers are in a high speed while racing each other, they are stable in their direction, because they are in high speed and if the direction went out of control slightly and they are in high speed, then maybe the cyclist will get injured.

Acceleration

When a car is speeding up we say that it is accelerating, when it slows down we say it is decelerating.

How do we calculate it?

When we want to calculate it, the method goes like that: A lorry driver brakes hard, and slows from 25 m/s to 5 m/s in 5 seconds. What was the vehicle's acceleration?

$acceleration=\frac{changeinvelocity}{timetaken}=\frac{5-25}{5}=\frac{-20}{5}=-4m{s}^{-2}$

What is initial velocity and final velocity? Initial velocity is the beginning before motion starts or in the middle of the motion, final velocity is when the motion stops.

There is another way to calculate it and it is like that This equations which are written is the primary ones, which means that when you don’t have lets say final velocity, how will you calculate the equation?

This is the way you are going to calculate.

Observing motion

When you want to know how fast is the athletic person runs, what you need is a stopwatch in your hand, then when the person starts to run, you start the stopwatch and when the person who is sprinting stops at the end point, you stop the watch and see how fast did he run, and if you want to see if the athlete is wasting his energy, while he is running look at his movement, and you will know by that if he is wasting his energy or no.

This athletic person is running, and while he is running the scientist could know if he was wasting his energy if they want by the stop watch and looking at his momentum.

Measuring acceleration

Take a slope, a trolley, some tapes and a stop watch, then put the tapes on the slope and take the trolley on the slope, and the stopwatch in your hand, as soon as you release the trolley, start timing the trolley at how fast it will move, when the trolley stops at the end then stop the timing. After wards, after seeing the timing , record it, then you let the slope a little bit high, and you will see, how little by little it will decelerate.

Who is Newton, and what did he observe?

He was an English physicist, mathematician, astronomer, alchemist, and natural philosopher, he has three laws for physics, and they are:

1. Newton's First Law (also known as the Law of Inertia) states that an object at rest tends to stay at rest and that an object in uniform motion tends to stay in uniform motion unless acted upon by a net external force.
2. Newton's Second Law states that an applied force, F, on an object equals the time rate of change of its momentum, p. the acceleration of an object is directly proportional to the magnitude of the net force acting on the object and inversely proportional to its mass. In the MKS system of measurement, mass is given in kilograms, acceleration in metres per second squared, and force in newtons (named in his honour).
3. Newton's Third Law states that for every action there is an equal and opposite reaction.

Symbols

Distance travelled=D

Force= F

Initial velocity=U

Final velocity=V

Velocity=V

Acceleration=A

Change in velocity=∆V

Mass=M

Newton=N

Gravity= G

Weight=W

Force

Now here we are going to learn how to calculate the force, mass and acceleration. When we want to calculate the force, and we have the mass and acceleration, how are we going to calculate it? force=mass multiply acceleration This is considered in the second law of Newton. What is mass? Sometimes it is defined as the amount of matter in a body. But in Newton’s second law is defined as a numerical measure of inertia. What is inertia? The tendency of a body to maintain is state of rest or uniform motion unless acted upon by an external force. Areas of the geometrical shapes Triangle=½base×┴height

Who is Hooke, and what is his law? (July 18, 1635 – March 3, 1703.)He was an English polymath who played an important role in the scientific revolution, through both experimental and theoretical work. His law was about the spring limit, if you have stretched the spring beyond its limit, it will then change permanently, and will not return to its original place. The rubber band doesn’t obey hooke’s law. This spring is not beyond its limit, so when you remove the weight, then it will automatically return to its place.

What is thinking distance and stopping distance, and how it is connected to each other? Thinking distance is the time between you think to apply the brake in the car and stopping distance is how long it takes you to stop the car from a certain speed to a certain distance. It meant like that and the connection between those 2 is the car, they are all applied to the car. Car safety How many of car safety could you think of?

• Air bag • Safety belt • Brakes • Reverse back up sensor • Cruise control • Anti lock braking system • Electronic brake force distribution • Brake assist system • Crumple zones • Crash compatibility • Pedestrian protection system