Question

Which would require a greater force –– accelerating a 2 kg mass at 5 m s–2 or a 4 kg mass at 2 m s-2 ?

NCERT Class IX
Sciences - Main Course Book

Chapter 9. Force and Laws of Motion

Answer 1

Mass 1 = 2 kg
Acceleration 1 = 5 m/s²
Force 1 = 2 × 5 = 10 N

Mass 2 = 4 kg
Acceleration 2 = 2 m/s²
Force 2 = 4 × 2 = 8 N

Since, 10 N ≥ 8 N
Therefore, a greater amount of force is required to accelerate a mass of 2 kg at 5 m/s².