Fall 2024 Finals Review A

Front

What is a vector quantity?

Back

A vector quantity is a physical quantity that has both magnitude and direction, such as force, velocity, and displacement.

Front

What is a scalar quantity?

Back

A scalar quantity is a physical quantity that has only magnitude and no direction, such as mass, temperature, and energy.

Front

What is the formula for calculating potential energy?

Back

Potential energy (PE) = mass (m) × gravitational acceleration (g) × height (h).

Front

Calculate the potential energy of a 3 kg object raised to a height of 5 meters. (g = 9.8 m/s²)

Back

Potential energy = 3 kg × 9.8 m/s² × 5 m = 147 J.

Front

What is the formula for calculating kinetic energy?

Back

Kinetic energy (KE) = 0.5 × mass (m) × velocity (v)².

Front

Calculate the kinetic energy of a 10 kg object moving at a speed of 3 m/s.

Back

Kinetic energy = 0.5 × 10 kg × (3 m/s)² = 45 J.

Front

What is Newton's second law of motion?

Back

Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F = m × a).

Front

If a 15 kg object is subjected to a net force of 45 N, what is its acceleration?

Back

Acceleration = Force / Mass = 45 N / 15 kg = 3 m/s².

Front

What is displacement?

Back

Displacement is the shortest distance from the initial to the final position of an object, taking direction into account.

Front

Calculate the displacement of a car that travels 60 km north and then 80 km east.

Back

Displacement = √(60² + 80²) = √(3600 + 6400) = √10000 = 100 km.