Physics Revision Flashcards
(20 cards)
What causes gas pressure?
Gas pressure is caused by moving gas particles colliding with surfaces.
What is Archimedes’ Principle?
Objects experience upthrust equal to the weight of fluid displaced. Float if upthrust ≥ weight.
What is a moment in physics?
A moment is the turning effect of a force around a pivot.
Formula: Moment = Force x Distance from pivot
What do gears do?
Gears transfer turning force.
Large → small gear = faster; Small → large gear = more force.
What is density?
How tightly mass is packed into a space.
Formula: Density = Mass ÷ Volume
What is the formula for calculating density?
Density = Mass ÷ Volume
What is pressure?
How much force is applied to an area.
Formula: Pressure = Force ÷ Area
What is the formula for calculating pressure?
Pressure = Force ÷ Area
How does pressure in liquids change with depth?
Pressure increases with depth and liquid density.
Formula: Pressure = Density × Gravity × Depth
What is the formula for pressure in liquids?
Pressure = Density × Gravity × Depth
What causes atmospheric pressure?
Caused by air’s weight.
True or False: Pressure in liquids is constant regardless of depth.
False
What is the relationship between gear size and force?
Small gear to large gear equals more force
This principle is often used in mechanical systems to amplify force.
What causes planets to orbit the Sun?
Gravity
This gravitational force is what keeps planets in their elliptical orbits around the Sun.
What keeps satellites in motion around planets?
Forward speed and gravity
Satellites maintain their orbit by balancing the gravitational pull of the planet with their forward momentum.
Define weight in a scientific context.
Force of gravity on an object
Weight is dependent on both the mass of the object and the gravitational acceleration acting on it.
What is the formula for calculating weight?
Weight = Mass × Gravity
This formula illustrates how weight varies with changes in mass or gravitational force.
State Newton’s First Law of Motion.
Objects stay still or moving unless a force acts
This law emphasizes the concept of inertia.
What does Newton’s Second Law of Motion state?
Force = Mass × Acceleration
This law quantifies the relationship between force, mass, and the acceleration of an object.
What is the essence of Newton’s Third Law of Motion?
Every action has an equal and opposite reaction
This principle explains interactions between two bodies and is fundamental in understanding motion.
