Question

a 5kg block is pulled across a table by a horizontal force of 40 N with a frictional force of 8 N opposing the motion. calculate the acceleration of the object

Answer 1

Acceleration = Net force/mass

here,

Net force = 40 - 8 = 32 N

friction will negative because acceleration is against the frictionso,

acceleration = 32/5

= 6.4 m/s²

Answer 2

Answer:

The acceleration of the block is $6.4m/s^{2}$

Explanation:

Given that,

A 5kg block is pulled across a table by a horizontal force of 40 N with a frictional force of 8 N opposing the motion.We are required to calculate the acceleration of the object.

Let us write the given data in symbolical form as shown below-

$m=5kg\\F=40N,f=8N$

According to Newton`s law,the net force on the system is product of its mass and acceleration.Therefore,we can write-

$F-f=ma$

Substituting the known values in the above relation,we get

$40-8=5a= > a=\frac{32}{5}=6.4m/s^{2}$

Therefore,the acceleration of the block is found to be $6.4m/s^{2}$

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