KZN Physical Science Grade 12 June 2024 P1

Overview

• Total Marks: 100
• Grade: 12
• Time: 2 Hours
• Subject: Physical Sciences P1 (Physics)

Multiple-Choice Questions (12 Marks)

• 1.1: B
• 1.2: A
• 1.3: D
• 1.4: B
• 1.5: D
• 1.6: B

Question 2 (21 Marks)

Newton's Second Law

• Acceleration is proportional to net force; inversely proportional to mass.
• Net force equals rate of change of momentum.

Forces and Free Body Diagram

• Label: Weight, Friction, Normal, Tension, Applied Force.
• Penalties for additional forces or incorrect diagram.

Calculations

• Equations provided for object and block systems.
• Ratio of forces and related calculations.

Question 3 (16 Marks)

Free Fall

• Motion with only gravitational force acting.

Calculations

• Time calculation using formulas for both downward negative and positive.
• Trajectory equations for tennis ball and stone.

Graphs

• Initial velocities, firing time, and graph parallelism must be indicated.

Question 4 (16 Marks)

Impulse and Momentum

• Impulse equals force times time.
• Linear momentum is conserved in isolated systems.

Calculations

• Momentum calculations before and after scenarios.

Question 5 (21 Marks)

Mechanical Energy

• Total mechanical energy remains constant in an isolated system.

Non-conservative Forces

• Forces where work depends on path taken, not position.

Calculations

• Energy and force path calculations.

Power

• Rate of energy transfer or work done.

Question 6 (14 Marks)

Doppler Effect

• Frequency change due to relative motion of sound source and listener.

Spectral Lines

• Shift towards longer wavelengths indicates star motion.

Practical Applications

• Used to determine artery health and fetal heartbeat.

Total Marks: 100