Edexcel IGCSE Physics: Double Science 復(fù)習(xí)筆記：4.2.3 Kinetic Energy
Edexcel IGCSE Physics: Double Science 復(fù)習(xí)筆記：4.2.3 Kinetic Energy
Kinetic Energy
- The kinetic energy (KE) of an object (also known as its kinetic store) is defined as:
The energy an object has as a result of its mass and speed
- This means that any object in?motion?has kinetic energy
- Kinetic energy can be calculated using the equation:
KE = ? ×?m?×?v2
- Where:
- KE = kinetic energy in Joules (J)
- m?= mass of the object in kilograms (kg)
- v?= speed of the object in metres per second (m/s)
Worked Example
Calculate the kinetic energy stored in a vehicle of mass 1200 kg moving at a speed of 27 m/s.
Step 1: List the known quantities
-
- Mass of the vehicle,?m?= 1200 kg
- Speed of the vehicle, v = 27 m/s
Step 2: Write down the equation for kinetic energy
KE = ??mv2
Step 3: Calculate the kinetic energy
KE = ? × 1200 × (27)2?= 437 400 J
Step 4: Round the final answer to 2 significant figures
KE = 440 000 J
Exam Tip
When calculating kinetic energy, make sure you know that?only?the speed is?squared?–?not?the mass or the ?
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