# What will be the new position of the centre of gravity if 100kg

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WHAT IS FORCE?
It is a push or pull that can deform an object or change its state of rest of motion.

•There are 4 different types of forces: Contact, non-contact, instantaneous, constant.
•The fórmula of force is:

F= m•a

DIFFERENCE BETWEEN FORCE AND

WEIGHT

Weight is a force. Everything on earth is pulled

down towards he ground by gravity. The weight of

an object is how hard gravity pulls down on it.

Larger objects get pulled more strongly, so they

weight more than smaller objects.

When sciencists want to talk about how much

stuff is inside something they talk about mass.

CAUSES OF FORCE

Forces arise when Two or more bodies come into

contact, For example, when there is a crash or

when you push a door.

Bodies, even if they are not in contact,

exert a force on others. For example,

the force of attraction of a magnet towards

something metallic or the force of gravity itself

that the earth exerts.

WHAT A DYNAMOMETER IS?

The dynamometer is an instrument used to

measure forces or to calculate the weight of objects.

This devices have a spring with a hook in which we put the object of which we want to calculate the weight, the more weight we put, the more the spring is streched, This is how the weight is measured.

4 FUNDAMENTAL INTERACTION

- Strong nuclear force

- Electromagnetic force

- Weak nuclear force

- Gravitational interaction

NEWTON’S LAWS

LAW OF INERTIA

If you apply a force to an object of mass (m), you accelerate it in the direction of the force.

FUNDAMENTAL PRINCIPLE OF DINAMICS
Even if the same force is applied to each object, each will reach a different acceleration

Formula:  F= m • x

LAW OF ACTION REACTION

If you apply a force to an object will apply a force with the same magnitude but in the opposite direction.
Formula: P= m • g

HOOWE’S LAW

Hook law is the one that works with springs to find the wheight of the object we are measuring

The extension or compression of an elastic body is directly proportional to the force applied to it

F = Force (N)

K = Constant of elasticity (N/m)

X = Strenght (m)

PRINCIPAL FORMULA:  F= K • X

TO FIND (K): K= F:X

TO FIND (F):  F= m •.G

TO FIND (X):  X= X - X0   /  X= F:K

DIRECTION OF FORCES

Abajo: P (weight)

Arriba: N/Fn (Normal force)

Izquierda: Fr/F2 (Friction force)

Derecha: F/F1 (Tension force)

FÓRMULAS PRINCIPALES:

F= m • a . (Problemas normales)

F= K • X   (problemas de hook)

LAST UNIT

Para problemas U.A.R.M

S= S0 + V0 • t + 1:2 a • t

V= V0 + a • t

a= V - V0 (partido) t

t= V - V0 (partido) a

Para problemas U.R.M.

S= S0 + v • t

V= S - S0 (partido) t                S= v • t

V= s (partido) t

T= S - S0 (partido) v               T= s (partido) v

THEORY LAST UNIT

Trajectory: The geométric line that a moving object describes

Distance travelled: It fefers to how far an object moves along a trajectory

Displacement: It’s the distance between Two differents positions of moving objects (it’s measured in a straight line)

Speed: It’s the quantity that tells us how quickly bodies change their position
Position: It’s a point on the trajectory determinated by a coordinate point