8 force is not with you shut up Flashcards
What is force
Pull or push upon on object
What are types of force
Gravitational force
Normal force
Weight
Elastic force
Buoyant force
Frictional force
What is gravitational force
Force that points towards the centre of the Earth
Causes all objects thrown upwards to fall back to Earth
What is normal force
Force produced when an object is in contact with a surface
(Perpendicular to object)
What is weight
Gravitational force acting on it
What is elastic force
When a material is stretched or compressed
What is buoyant force
Thrust force acting on an object that is floating on the surface of a fluid
What is frictional force
Force that resists movement between two surfaces that are in contact with each other
What is the direction of frictional force
Opposite direction of motion
What quantity is force
Vector quantity, has magnitude & direction
What is magnitude
Quantity or value of a measurement
What is the point of application
Exact location at which a force is applied to a body
How to measure force & what is the principle used
Spring balance
Spring extension - Magnitude is obtained by reading the scale on the balance
What is the SI unit of force
newton (N)
On Earth, I N -> ?
100g
or 1kg = 10N
What is Newton’s third law
For every action force, there is a reaction force of the same magnitude but in the opposite direction
Explain action-reaction pair of object on a table
Book on table experiences gravitational force = weight
A reaction called normal force exists in the opposite direction
Book remains on table because magnitude of the weight (action) = normal force (reaction)
Explain the action-reaction pair of an object that floats on water
Object on water experiences gravitational force = weight
A reaction called buoyant force exists in the opposite direction
Object floats on water because magnitude of weight (action) = buoyant force (reaction)
Explain the action-reaction pair between two trolleys in contact with each other and launched with a spring mechanism
Trolley 1 w/ spring: Exert elastic force on trolley 2 (action)
Trolley 2: Exert elastic force of same magnitude in the opposite direction (reaction)
When two trolleys initially touching each other are launched, they will move at same distance but in opposite direction
