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

Classified in Physics

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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 t****han 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 **

(La t al cuadrado)

**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