Forces and motion : Introduction Flashcards
Unit of force
Newton (N)
Tension force
Force transmitted through a length of rope pulled tightly by equal forces acting from both ends
Friction force
The force between two surfaces which impedes motion and results in heating
Upthrust
The upward push of a liquid or gas on an object
Air resistance
A type of friction force that acts upon objects as they travel through air
Water resistance
A type of fricition force that acts upon objects as they travel through water
Gravitational force
Force of attraction between two seperated masses
Relationship between gravitational force and mass
It gets larger as one or both objects get larger
Why does a person experience a smaller force of gravity on the moon?
The moon has a smaller mass than earth
Value of gravitational field strength / acceleration due to gravity
10
Unit for gravitational field strength
N/Kg
Unit for acceleration due to gravity
m/s^2
What is weight?
The measure of the pull of gravity on an object
Unit for weight
Newtons
Weight equation
Weight = Mass * gravitational field strength
What do we use to measure mass?
A beam balance or an electronic balance
What do we use to measure weight?
A spring balance
What is resultant force?
The single force that has the same effects as two or more forces
What is a vector quantity?
A quantity that has both magnitude and direction
What is a scalar quantity?
A quantity that has magnitude only
What is a newton?
The force required to give a mass of 1Kg an acceleration of 1 m/s^2
