September Exams Flashcards
How’s an image made
Refracting light
Real vs virtual
Real - light rays come together / virtual - they don’t
Inertial mass
How hard it is to change the velocity of an object
Inertia
Objects stay still / same speed if no resultant force is applied
Newton’s 2nd law
Acceleration of an object is proportional to the resultant force acting on the object. It’s inversely proportional to the mass if the mass is greater the acceleration is smaller
Acceleration in fluid
The object is object falling in a fluid initially accelerate due to gravity, eventually resultant force = 0 and objects balanced meaning it travels at its terminal velocity (constant speed)
Acceleration meaning
How fast something speeds up/slows down, rate of velocity change
What’s the atmosphere
Thin layer of air around the Earth, gets less dense with increasing altitude
What happens to ur pressure if ur higher up in the atmosphere and why?
the density of gas particles is higher CLOSER to the Earth so more collisions between particles in an object so pressure is higher.
The higher up you are the less gas particles, weight, is above you so LESS pressure HIGHER UP
What happens if forces cancel eachother out
They are balanced so object is moving at a constant speed or stationary
Scalar vs vector quantities + examples
Scalar = magnitude (size) - speed Vector = magnitude and direction - force
Magnitude meaning
Size
Alternating vs direct current
Alternating-current continuously changed its direction, going back and forth a direct current is always flowing in the same direction
Mains supply Voltage and Hz
Voltage = 230 Hertz = 50
Potential difference meaning
Difference of electrical potential between two points
