Physics (4th) Flashcards
The measure of the force that can cause an object to rotate about an axis.
Torque
Torque is also called a?
Moment of a force
In torque, the force applied to the body should be __________ to the moment arm or lever arm in order for torque to take place.
Perpendicular
This is the perpendicular distance from the axis of rotation to the line of action
Lever arm
Lever arm is also called a?
Moment arm
What is the symbol for torque and its unit?
T
N.m
Torque and force has a?
Direct relationship
Torque and lever arm/moment arm has?
Direct relationship
Force and lever arm/moment arm has?
Inverse/indirect relationship
If it rotates counter-clock wise it is?
Positive torque
If it rotates clock wise it is?
Negative torque
This is commonly used term in sports. An object with ______ is going to be hard to stop
Momentum
What is the symbol for momentum?
small “p”
What is the unit of momentum?
kg.m/s or N.s (Newton seconds)
Momentum is a vector or scalar quantity?
Vector
mass, velocity, and momentum has a?
Directly proportional/direct relationship
Mass and velocity has?
Inverse relationship/indirect
Momentum can be applied in real life like?
car safety.
This is the amount of force applied in certain amount of time to cause a change in momentum
Impulse
What is the symbol for impulse?
Big letter “I”
What is the unit for impulse?
Kg.m/s or Ns
What is the real life application of impulse?
Seat belt
Airbag
In a collision, an object experiences a force for a specific amount of time that results on a change in momentum. The results of the force action for the given amount of time is that the object’s mass either speeds up or slows down (or changes direction).
Impulse-momentum theorem
a substance that continually deforms (flow) under an applied shear stress or external force.
Fluid
Is concerned with the motion of the bodies under the action of forces including special case when the body remains at rest.
Mechanics
it is the field in physics that studies the motion and properties of static fluids.
Fluid mechanics
A material defined as the ratio of its mass(m) and volume(v).
Density
What is the unit for density?
kg/m^3 (m/V)
A substance is defined as the ratio of the density of the substance and the density of water at 4 degrees celsius.
Specific Gravity (SG)
SG dont have a
unit
Formula for SG is?
psub/pwater (Density of substance / density of water [1g/ml or 1/cm^3)
This is known for as the amount of force applied per unit area
Pressure
What is the unit for pressure?
N/m^2 or Pa
“If an external pressure is applies to a confined fluid, the pressure at every point within the fluid increases by the same amount”
Pascal’s Principle
What are the types of flow?
Laminar and turbulent flow
It’s a smooth flow?
Laminar flow
It is chaotic flow?
turbulent flow
When an object is completely is partially immersed in a fluid exert an upward (Buoyant) force on the object that is equal to the weight of the fluid displaced by the object.
Buoyancy and Archimedes’ Principle
In fluid dynamics, the continuity equation states that the rate at which mass enters a system is equal to the rate at which mass leaves the system; plus the accumulation of mass within the system.
Equation of Continuity
Increasing the lever arm will result to?
Increase of torque
The impulse-momentum relationship is direct result of?
Newton’s second law
This is the study of fluids in motion?
Fluid dynamics
