Shortcut Methods
Newton’s Second Law of Motion
- To find acceleration (a), use the formula:
a = F/m
- Where:
- a = acceleration (m/s²)
- F = force applied (N)
- m = mass of the object (kg)
Newton’s Third Law of Motion
- To find normal force (N) exerted by a surface, use the formula:
N = mg
- Where:
- N = normal force (N)
- m = mass of the object (kg)
- g = acceleration due to gravity (approximately 9.81 m/s²)
Shortcut Method:
- To directly find the final velocity (v) in case of collision problems involving momentum conservation:
(m₁v₁ + m₂v₂) / (m₁ + m₂)
- Where:
- m₁ = mass of object 1 (kg)
- v₁ = initial velocity of object 1 (m/s)
- m₂ = mass of object 2 (kg)
- v₂ = initial velocity of object 2 (m/s)
