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A force of 20 N moves a body with an acceleration of 2 $ms^{-2}$. What is its mass? (10kg)
Solution:
Force = F = 20 N
Acceleration = a = $2 ms ^{-2}$
Mass = m = ?
F = ma
Or $m = \frac{F}{a}$
$m = \frac{20}{2}$ = 10 kg
The weight of a body is 147 N. What is its mass? (Take the value of g as 10 $ms^{-2})$ (14.7 kg)
Solution:
Weight = w = 147 N
Acceleration due to gravity = g = 10 $ms ^{-2}$
Mass = m = ?
w = mg
or m = $\frac{w}{g}$
m = $\frac{147}{10}$
m = 14. 7 kg
How much force is needed to prevent a body of mass 10 kg from falling? (100 N)
Solution:
Mass = m = 50 kg
Acceleration = a = g = 10 $ms ^{-2}$
Force = F = ?
F = m a
F = $10 \times10$
F = 100 N
