In this guide, we will explore the concept of work, energy, and efficiency in the context of physics. Specifically, we will focus on Aktiviti 13 in the Buku Teks Fizik Tingkatan 4 KSSM (Kurikulum Standard Sekolah Menengah) textbook. This activity aims to help students understand the relationship between force, displacement, and work done, as well as the concepts of kinetic energy, potential energy, and efficiency.
Efficiency = (Work done / Energy input) × 100% = (980 J / 2000 J) × 100% = 49% In this guide, we will explore the concept
W = F × s = 50 N × 2 m = 100 J
Efficiency is a measure of how much of the input energy is converted into useful work. It is calculated using the equation: Efficiency = (Work done / Energy input) ×
A machine lifts a 100 kg load to a height of 5 m in 10 seconds. If the machine requires an input energy of 5000 J, calculate its efficiency. KE = ½ × m × v^2 = ½ × 5 kg × (2 m/s)^2 = 10 J
KE = ½ × m × v^2 = ½ × 5 kg × (2 m/s)^2 = 10 J