P8: Forces in Balnce Flashcards
What is a scalar quantity?
A quantity that only has magnitude
What is a vector quantity?
A quantity that has both a magnitude and direction
How can a bector quantity be drawn and what does it show?
As an arrow
The length of the arrow represents the magnitude
The arrows points in the associated direction
What is a force?
A push or pull acting on an object die to an interaction with another object
What are the 2 categories of forces?
Contact forces
Non-contact forces
Give 3 examples of contact forces?
Friction
Air resistance
Tension
Give three examples of non-contact force?
Gravitational forces
Electrostatic forces
Magnetic forces
Is force a vector or scalar quantity?
Vector
It has both a magnitude and an associated direction
Give 3 examples of vector quantities?
Velocity
Displacement
Force
Give 3 examples of scalar quantities?
Temperature
Time
Mass
Speed
Distance
Energy
What is weight?
The force that acts on an object due to gravity and the object’s mass
What quantities does weight depend on?
The objects mass
The gravitational field strength at the given position in the field
What is the unit used for weight?
Newtons (N)
What is the unit used for gravitational field strength?
N/Kg
What is meant by an object’s centre of mass?
The single point where an object’s weight can be considered to act through
