Year 11 Term 1 Flashcards
Define force
At its core, force is an interaction between 2 objects; the interactions are push/pull and attraction/repulsion
Identify whether force is scalar or vector quantity
Force is a vector quantity
True or False: Force exist in pairs
True (action-reaction forces)
Identify the purpose of free-body diagrams
Free-body Diagrams is a technique to illustrate the external forces acting on a body
When the net force of an object is zero, the object is in:
When the net force of an object is zero, the object is in:
- Static Equilibrium
- Dynamic Equilibrium
Define external forces
External Forces are between the system and its surroundings
Define internal forces
Internal Forces are between components within the system
True or False: Given that F_net = 0, the components in the x and y-direction = 0
True
Recall Newton’s First Law of Motion
Newton’s First Law of Motion states a body at rest remains at rest, or, if in motion, remains in motion at a constant velocity unless acted upon by a net external force.
Recall Newton’s Second Law of Motion
Newton’s Second Law of Motion states the net force is equal to the product of mass and acceleration (F_net=ma)
Recall Newton’s Thrid Law of Motion
Newton’s Third Law of Motion states for each action (force), there is an equal and opposite reaction
Define weight
Weight is the force acting on an object due to acceleration of gravity
Define mass
Mass is the amount of particles in an object
Define normal force
Normal force (N) is a perpendicular force to the surfaces in contact, hence is a contact force
Weight formula
W = mg
Define tension
A force along the length of a medium, especially a force carried by a flexible medium, such as a rope or string
Identify whether tension is a scalar or vector quantity
Tension is a vector quantity
Tension formula
T = mg + ma
Define friction
Friction is a force that opposes relative motion between two surfaces in contact
Types of Friction
Kinetic friction
- Sliding friction
- Rolling friction
Static friction
Define fluid friction
Fluid Friction is the resistance created through motion in a medium of liquid or gas; drag
Kinetic friction formula
f_k = μ_k N
Static friction formula
f_s ≤ μ_s N
True or False: Friction is proportional to the surface area
False: Friction is proportional to the normal force and contact area not surface area as contact area ≠ surface area