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:
DIFFERENCE BETWEEN FORCE AND
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
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
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)
F= m • a . (Problemas normales)
F= K • X (problemas de hook)
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