Lesson 1

44問 • 1年前

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• A body at rest will remain at rest, and a body in motion will remain in motion unless it is acted upon by an extenrnal force. Ex: - A dropped ball continues falling - An apple resting on a table does not spontaneously move

first law

• The force acting on an obejxt is equel to the mass of the object is time it's acceleration • F = ma • 1 N = 1 kg m/s2 ( 1 Newton is one kilogram-meter per second squared) Ex: - It takes more effort moving a heavy box than the light one - It hurts more getting hit with a fast moving baseball than a slower one. Each ball has the same, but force depends on the acceleration

second law

• for every action, there is an equel and opposite reaction Ex: - If you are wearing roller skates and you push another person wearing skates, you both move - When walking, the feet push backward on the ground while the ground pushes the feet forward

third law

Amount of matter in an object

mass

Use triple beam balance to measure mass

mass

Unit of mass

kg (kilogram)

A measure of gravitational force attraction of an object (g)

weight

Depends on where the object is (your weight on earth is not the same as your weight on the moon)

weight

It is measure using spring scale

weight

Weight is measure using

spring scale

Weight = mass × gravity

formula of weight

Units of weight

N (kg m/s2)

A push or pull which occurs between two objects

force

Are forces that require direct physical contact between to objects

contact forces

A force typical push or pull

applied force

Happens when two objects rub against each other

friction

A type of frictional force that acts upon objects as they travel through air

Air resistance

Is the support exerted upon an objects that is contact with another stable object

Normal force

Are forces that act on objects without the need of physical contact

Non contact forces

Is a non contact force that can be either attract or repel magnetic objects

magnetic

The strength of the ______ depends on the type of magnetic material and the distance between the object

magnetic

The forces that attraction between any two objects in the universe, the mass of an object and it's distance determine the strength of its gravitational force

Gravitational force

Can pull planets together in the solar system, and can make object stay on the surface of the earth

gravitational force

Affect the force of gravity. The greater the mass and the closer the objects, the stronger the gravitational force

mass and distance

Non contact force of electrical charges

electric force

Is a flow of electric changes, and it can create a force between objects, the strength of the electric force depends on the amount on the objects and the distance between them

electricity

Done only when the object which is force is applied moves through certain distance

Work

Work is expressed as

W = F∆d

Defined as the rate of doing work

power

The amount of moving object is called

Kinetic energy

If an object is at rest and is an state of equilibrium then we would say that the object is at static equilibrium. Static means stationary or at rest

static equilibrium

In physics, it is the rotational equivalent of a linear momentum

angular momentum

Angular momentum = Moment of inertia × angular velocity

L = I × W

Linear momentum = Mass × velocity

P = M × V

Is a description of motion, the kinematics of rotational motion describes the relationship among rotational angle, angular velocity, angular acceleration, and time

rotational kinematics

best known as Newton's law of universal gravitational due to the universality of gravity

nation's law of gravitation

Discovered that the gravity is universal as all objects attracts each others I thought a force of gravitational attraction

newton

This states that every particle of matter in the universe attracts every other particles with a force that is directly proportional to the product of the mass of the particles and inversely proportional to the square of the distance between them

Newton's law of universal gravitational

Used instroment called a torsion in 1798 to determine G, the presented accepted value is G=6.67×10-11 N × m2/kg2

Henry Cavendish

A measure of how much the material or matter is in object

mass

Is a measure of gravitational force exerted on an object due to gravity

weight

Are proportional to each other within the acceleration die to gravity as proportional constant

mass and weight

gained by an object due to gravitational force

acceleration

Is the nergy stored in an object due to its position above earth surface

gravitational potential energy

MIL - Part 1

Claire Sadaya · 100問 · 1年前

MIL - Part 1