PA: Semester Knowledge Check

Front

What is acceleration?

Back

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.

Front

How do you calculate acceleration if a car starts from rest and reaches a velocity of 30 m/s in 10 seconds?

Back

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

Front

What does a horizontal line on a position-time graph indicate?

Back

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

Front

What is Ohm's Law?

Back

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: \( V = I \cdot R \).

Front

How do you calculate current in a circuit with a 5 Ω resistor connected to a 10 V battery?

Back

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

Front

What is Newton's Third Law of Motion?

Back

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

Front

What is the SI unit of electric charge?

Back

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

Front

What is the difference between speed and velocity?

Back

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.

Front

What is the formula for calculating kinetic energy?

Back

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

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.