Physical Science 2nd Nine Weeks Semester Exam

Front

What type of energy transformation occurs when food is consumed?

Back

Chemical to mechanical energy transformation occurs when food is consumed, as the body converts chemical energy from food into mechanical energy for movement.

Front

What is the difference between speed and velocity?

Back

Velocity is defined as speed with a specific direction, while speed is a scalar quantity that only measures how fast an object is moving.

Front

What is the melting point of a substance?

Back

The melting point is the temperature at which a solid becomes a liquid. For example, the melting point of ice is 0°C.

Front

How do you calculate current in a circuit?

Back

Current (I) can be calculated using Ohm's Law: I = V/R, where V is voltage and R is resistance.

Front

What is the Doppler effect?

Back

The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer moving relative to the wave source.

Front

Define kinetic energy.

Back

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

Front

What is potential energy?

Back

Potential energy is the stored energy of an object due to its position or state, such as gravitational potential energy.

Front

What is the formula for calculating speed?

Back

Speed is calculated using the formula: Speed = Distance / Time.

Front

What is the principle of conservation of energy?

Back

The principle of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

Front

What is the difference between conductors and insulators?

Back

Conductors allow electric current to flow easily, while insulators resist the flow of electric current.