8 effect of force of ur mom Flashcards
What are the effects of force
Moving a stationary object
Stopping a moving object
Changing the speed of an object in motion
Changing direction of motion of object
Changing shape and size of object
When will an object float
When buoyant force acting on it is enough to support its weight (buoyant = weight)
When will an object submerge
Buoyant force acting on it is not enough to support its weight (buoyant < weight)
Formula for buoyant force
Actual weight - apparent weight
What is actual weight
Weight of object in the air
What is apparent weight
Weight of object immersed in fluid
Relationship between density and buoyant force
Object less dense than liquid, buoyant force is more than weight -> pushes object up to the surface -> float
Object more dense than liquid, buoyant force less than weight -> object submerges at the bottom of liquid
What is the use of Plimsoll lines
Marked on cargo ship for safety
Differences in temperature & concentration of salt -> density of sea water is different in parts of world
Used to determine the safe level for a ship to stay afloat
What is the levels of a Plimsoll line
TF - Tropical freshwater
F - Freshwater
T - Tropical zone
S - Summer
W - Winter
WNA - Winter North Atlantic
What is a lever
Bar that rotates on a fixed point (simple machine)
What is the component of a lever
Effort = Force applied on the bar
Load = Object to be moved
Fulcrum = Fixed support point
What is the advantaes of a lever
Allows us to do work easily
Allows us to use minimal force to do work
What are the classification of levers
First class = F
Second class = L
Third class = E
Which types of levers save energy & conditions?
First -> if EF > LF
Second -> Definitely saves energy - EF > LF Always
Which lever does not save enegry & other advantage & disadvantage of it
Third class -> LF > EF
Load can move greater distance than effort
Doesn’t change direction nor strength
