Physics Mid-term 2021

Front

What is the principle of free fall?

Back

In a vacuum, all objects fall at the same rate regardless of their mass, due to the acceleration of gravity.

Front

What is the formula for the period of a pendulum?

Back

T = 2π√(L/g), where T is the period, L is the length of the pendulum, and g is the acceleration due to gravity.

Front

What is the acceleration due to gravity on Earth?

Back

Approximately 9.81 m/s².

Front

What is the concept of time dilation in relativity?

Back

Time dilation refers to the phenomenon where time passes at a different rate for observers in different frames of reference, particularly at high speeds.

Front

What is the relationship between mass and energy according to Einstein's theory?

Back

E = mc², where E is energy, m is mass, and c is the speed of light.

Front

What is the definition of kinetic energy?

Back

Kinetic energy is the energy an object possesses due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

What is the concept of momentum?

Back

Momentum is the product of an object's mass and its velocity, expressed as p = mv.

Front

What is the difference between speed and velocity?

Back

Speed is a scalar quantity representing how fast an object moves, while velocity is a vector quantity that includes direction.

Front

What is the formula for calculating the distance fallen under gravity?

Back

d = 1/2 gt², where d is distance, g is acceleration due to gravity, and t is time.

Front

What is the significance of the reference frame in physics?

Back

A reference frame is a perspective from which measurements are made, affecting observations of motion and time.