Question

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

Answer 1

Answer:

Explanation:

ewton's 2nd Law:

Newton's 2nd Law states that the acceleration of an object is proportional to the total sum of forces, or net force, acting upon that object:

∑

F

=

F

n

e

t

=

m

a

where  

m

is the mass of the object.

Answer and Explanation:

The net force on the block is

F

n

e

t

=

40

−

8

=

32

 

N

in the direction of the applied force. Substituting this value and the given mass into the statement of Newton's 2nd Law, we can calculate the resulting acceleration:

F

n

e

t

=

(

5

)

a

=

32

so

a

=

32

5

=

6.4

 

m

/

s

2

Answer 2

Answer:

6.4 m/s^2 is the acceleration.

Explanation:

apply F=ma formula after subtracting friction from force applied.