Chap-8 Flashcards
What is force?
Force is a pull or a push upon an object
a)Force is a vector quantity that has____ and ___. b)Force also has ___
a) magnitude ; direction
b )point
S.I. unit for force is ?
Newton,(N)
Newton’s Third Law states what ?
Newton’s Third Law states that for every action force, there is a reaction force of the same magnitude but in the opposite direction
Effects of force ?
-Force can change shape, size and motion of the object
1.Moving a stationary object
2.Stopping a moving object
3.Changing the speed of an object that is in motion
4.Changing the direction of an object that is in motion
5.Changing the shape and size of an object
Explain Buoyant Force and Density .
Buoyant force = Actual weight - Apparent weight
1.The denser the object, the lesser the buoyant force than the object. Thus, the object submerge
2.The less dense the object, the higher the buoyant force than the object. Thus, the object float
What is Effort in Lever?
Force applied on the bar
What is Load in Lever?
Object to be moved
What is Fulcrum in Lever?
Fixed support point
How many Classification of levers are there ? Explain them .
FLE
123
What is the formula for The Moment of Force ?
Moment of force = Force(N) x Perpendicular distance from the pivot to the (m)
Define pressure .
Pressure is defined as force per unit area (direction of force is perpendicular to the surface area)
What is S.I unit for pressure ?
pascal (Pa)
What is the formula to calculate pressure ?
Pressure = Force (N) / Surface area (m2)
The frequency of collision between the air molecules and the walls of the container will produce a force that pushes against the walls which is called ?
air pressure / gas pressure