Key Concepts Of Physics Flashcards
What is the formula for calculating speed?
Speed = Distance / Time
Fill in the blank: The unit of force is _______.
Newton
What is the law of conservation of energy?
Energy cannot be created or destroyed, only transformed.
Which of the following is a vector quantity? A) Mass B) Speed C) Velocity D) Temperature
C) Velocity
What is the gravitational force on Earth approximately equal to?
10
What is the difference between mass and weight?
Mass is the amount of matter in an object; weight is the force exerted by gravity on that mass.
True or False: An object in motion will stay in motion unless acted upon by an external force.
True
Fill in the blank: The device that measures temperature is called a _______.
Thermometer
What is the formula for calculating kinetic energy?
Kinetic Energy = 1/2 * mass * velocity²
What is the principle of moments?
For a system in equilibrium, the sum of clockwise moments about a pivot equals the sum of anti-clockwise moments.
Which type of energy is stored in a compressed spring?
Elastic potential energy
What is the SI unit of power?
Watt
What does the term ‘efficiency’ mean in physics?
Efficiency is the ratio of useful energy output to total energy input, usually expressed as a percentage.
Fill in the blank: The force of gravity between two objects depends on their _______ and the distance between them.
Masses
What is the definition of work done?
Work done is the energy transferred when a force moves an object over a distance.
True or False: A conductor allows electric current to flow easily.
True
What is Ohm’s Law?
Voltage = Current × Resistance
What is the difference between series and parallel circuits?
In a series circuit, components are connected end-to-end; in a parallel circuit, components are connected across common points.
Fill in the blank: The energy stored in a battery is known as _______ energy.
Chemical
Which type of wave requires a medium to travel through?
Mechanical wave
What is the frequency of a wave?
The number of waves that pass a point in one second.
True or False: Sound travels faster in air than in water.
False
What is the formula for calculating gravitational potential energy?
Gravitational Potential Energy = mass × gravitational field strength × height
What is meant by ‘thermal conduction’?
The transfer of heat through a material without the movement of the material itself.
Fill in the blank: The process of changing from a liquid to a gas is called _______.
Evaporation
