Physics Flashcards
What is the formula for calculating force?
Force = Mass x Acceleration
True or False: Energy can be created or destroyed.
False
Fill in the blank: The unit of power is ___ .
Watt
What is the principle of conservation of energy?
Energy cannot be created or destroyed, only transformed.
What is the acceleration due to gravity on Earth?
9.81 m/s²
Which of the following is a vector quantity? (a) Mass (b) Speed (c) Velocity
c) Velocity
What is the definition of work in physics?
Work is done when a force causes displacement.
True or False: An object in motion will remain in motion unless acted upon by an external force.
True
What is the formula for kinetic energy?
Kinetic Energy = 0.5 x Mass x Velocity²
Fill in the blank: The law of universal gravitation states that every point mass attracts every other point mass with a force proportional to the product of their ___ .
masses
What is the unit of measurement for electric current?
Ampere
What does the symbol ‘c’ represent in physics?
The speed of light in a vacuum.
True or False: In a vacuum, all objects fall at the same rate regardless of their mass.
True
What is the formula for potential energy?
Potential Energy = Mass x Gravity x Height
What is the difference between speed and velocity?
Speed is scalar; velocity is vector and includes direction.
Fill in the blank: The ___ is the measure of the average kinetic energy of the particles in a substance.
temperature
Which law states that for every action there is an equal and opposite reaction?
Newton’s Third Law of Motion
What is the SI unit of force?
Newton
True or False: The total momentum of a closed system remains constant.
True
What is the formula for calculating pressure?
Pressure = Force / Area
Fill in the blank: The ___ of an object is the amount of matter it contains.
mass
What is the principle of moments?
For an object to be in equilibrium, the sum of clockwise moments about a pivot must equal the sum of anti-clockwise moments.
What is the relationship between frequency and wavelength in a wave?
Frequency = Speed / Wavelength
True or False: A wave can transfer energy without transferring matter.
True
What is the law of reflection?
The angle of incidence is equal to the angle of reflection.
What does Ohm’s Law state?
Voltage = Current x Resistance
Fill in the blank: The ___ is the distance traveled by a wave in one complete cycle.
wavelength
