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Chapter 1: Force and Pressure - Coggle Diagram
Chapter 1: Force and Pressure
what is force
when we push or pull an object, we exert a force
effects of force
change the direction of moving objects
change the speed of moving objects
change the state of rest or motion of a body
cause objects to turn
change the size and shape of objects
types of forces
contact forces
frictional force
frictional force acts when 2 surfaces are in contact with each other
friction acts in the opposite direction to motion
how to reduce friction
apply lubricants like grease or oil to the surfaces in contact
preventing or reducing contact between the two objects
attach ball bearings to the surfaces in contact
having a smooth body reduces water and air resistance
having a streamlined body shape
non-contact forces
magnetic force
force of attraction or repulsion between two magnets
can act at a distance
gravitational force
force of attraction between two bodies
Weight of a body is the gravitational force acting on it
weight
gravitational force acting on a body
SI unit: newton(N)
formula
W=mxg
mass
amount of matter in a body
SI unit: kilogram(kg)
pressure
force acting per unit area
formula
P=F/A
the smaller the area, the greater the pressure. the greater the area, the smaller the pressure
knife's cutting edge is very thin, allowing the knife to cut objects easily
caterpillar tracks on tanks increase the area of the tank touching the ground, reducing pressure on the ground and allowing the tank not to get stuck in mud
SI unit: pascal(Pa)