PA: Semester Knowledge Check

Acceleration is the rate of change of velocity of an object. It is calculated using the formula: \( a = \frac{\Delta v}{\Delta t} \), where \( \Delta v \) is the change in velocity and \( \Delta t \) is the change in time.

Using the formula \( a = \frac{\Delta v}{\Delta t} \): \( a = \frac{30 m/s - 0 m/s}{10 s} = 3 m/s^2 \).

A horizontal line on a position-time graph indicates that the object is at rest, meaning its position does not change over time.

Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R). It is expressed as: \( V = I \cdot R \).

Using Ohm's Law: \( I = \frac{V}{R} = \frac{10 V}{5 \Omega} = 2 A \).

Newton's Third Law states that for every action, there is an equal and opposite reaction. This means that forces always occur in pairs.

The SI unit of electric charge is the Coulomb (C).

Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes both speed and direction.

The formula for kinetic energy (KE) is: \( KE = \frac{1}{2} mv^2 \), where \( m \) is mass and \( v \) is velocity.

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