Contact and Non-contact forces. And Gravity Flashcards
What do vector quantities and scalar quantities have in common?
They both include magnitude.
What is the difference between vector quantities and scalar quantities?
Vector includes both magnitude and direction whereas scalar quantities does not include direction.
Examples of vector quantities
Velocity Momentum Force Acceleration Weight
Example of Scalar quantities.
Speed
Mass
Distance
Temperature
What are the two categories of forces?
Non-contact and contact
What is a non-contact force?
Non-contact force is a force that can act without the need of two objects touching.
Examples of non-contact force.
Gravity
Magnetism
What is a contact force?
A force that requires two objects to be touching in order to act.
Examples of contact force.
Friction
Tension
Air resistance
What do we use to measure weight?
Newton meter (calibrated spring balance)
Is weight a vector quantity?
Yes
Is wight a scalar quantity?
No
What is a vector represented with?
An arrow
What does the length of the arrow and the direction of an arrow in a vector represent?
The direction of the arrow represents the direction.
The distance represents the magnitude.
What are forces always in an interaction pair always in?
Equilibrium and in opposite direction.
Forces always act from where?
Centre of mass.
What is the different between mass and weight.
Mass is constant whereas weight changes depending on location.
What is gravitational field strength?
The strength of gravity where you are.
What changes somethings gravitational field strength?
When mass changes, gravitational field strength changes. They are directly proportional to one another.
What is the unit of gravitational field strength and what is it measured in?
Gravitational field strength (g) is measured in newtons per kilogram (N/kg).
What is the relationship between wight and mass?
They are directly proportional.
What is the formula for weight?
Weight(N) = Mass(kg) x Gravitational Field Strength (N/KG)
