Physics Flashcards
(15 cards)
Estimations ~ Two floor house ~ Diameter of of the pupil of your eye ~ Hear beat in an hour when relaxed ~ Weigh of an apple in newtons ~ Mass of air in bedroom ~ Pressure do you exert on the ground standing on one foot
~ 7-8m ~ in dark = 5.0 mm, in bright = 1.0mm -> 1.0 - 5.0mm ~ 3600 - 4800 ~ 100g apple = 1N ~ 40kg ~ 20 000 Pa
Scalars
Vectors
Scalars: Measurements that have size, or magnitude
- Mass (kg)
Vectors: Magnitude and also have a direction
- Weight (N)
- Force (N)
Internal energy
Is the total kinetic and potential energy of the molecules of a body
Thermal energy
Is a (net) amount of energy transferred between two bodies, at different temperatures
Amplitude
The maximum displacement of the system from equilibrium
Damping
The amplitude of the oscillations
Half-life
The time taken for half of the nuclei in a sample to decay
Displacement
Displacement is defined as the distance travelled in a particular direction from a specific origin
Speed = distance / time
Velocity = displacement / time
Km h ^-1 = km / h
Acceleration
Acceleration is defined as the in velocity per unit time
a = v / t
ms^-2 = ms^-1 / s
Different types of force
- Friction
- Normal or Supporting or Contact force
- Tension and Compression
- Air resistance or Drag
- Upthrust or Buoyancy
- Lift
- Thrust
- Weight
Binding energy
The amount of work required to pull apart the constitution of a nucles
Gravitational field
Gravitational field strength (g)
Gravitational field: a region of space where a mass experiences a force because of its mass
Gravitational field strength (g): The force per unit mass experienced by a small test mass placed in the field
g = F/m Unit: N kg(-1) - vector quantity
Gravitational field
Gravitational field strength (g)
Gravitational field: a region of space where a mass experiences a force because of its mass
Gravitational field strength (g): The force per unit mass experienced by a small test mass placed in the field.
g = F/m Unit: N kg(-1) - vector quantity
Electric field
Electric field strength (E)
Electric field: a region of space where a charged object experiences force due to its charge
Electric field strength (E): The force per unit charge experienced by a small +ve test charge placed in the field.
E = F/q Unit: NC(-1) - vector quantity
Coulomb’s law
Coulomb’s law states that the force experienced by two point charges is directly proportional to the product of their charge and inversely proportional to the square of their separation.
