A body of mass 20 kg when applied a force of 100N , moved a distance of 50m and acquires a velocity of 8m/s. Find friction force
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A body of mass 20 kg when applied a force of 100N , moved a distance of 50m and acquires a velocity of 8m/s. Find friction force
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Given :
To find :
Solution :
To find the friction = ?
◈ First, we have to find the acceleration of the object.
◈ To find the acceleration of the object, we will use the equation of motion.
V² = u² + 2as.
Put the values in the formula.
➡ a = v²/2s
➡ a = 8×8/2×50
➡ a = 16/25 m/s².
∴ Acceleration of the object is 16/25 m/s².
Now,
To find the frictional force = ?
We will use the formula,
Fnet = ma
➡ 100 - f = 20 × 16/25
➡ 100 - f = 64/5
➡ f = 500-64/5
➡ f = 436/5
➡ f = 87.5 N.
Hence :