Question

Question 3 (1 point)

Answer 1

The force of friction is equal to the pushing force, and the acceleration is zero

Explanation:

In this problem, we are pushing a piano along the floor, in the horizontal direction.

There are 2 forces acting in the horizontal direction on the piano:

• The applied force, $F_a$, acting forward
• The force of friction, $F_f$, acting backward

Therefore, the net force in the horizontal direction is

$\sum F = F_a - F_f$

According to Newton's second law, the net force is equal to the product between the piano's mass (m) and its acceleration:

$\sum F = ma$

Combining the two equations,

$F_a - F_f = ma$

However, we are also told that the piano moves at constant speed, therefore the acceleration is zero:

$a=0$

And so,

$F_a - F_f = 0\\F_f = F_a$

which means that the force of friction is equal to the applied force.

Learn more about Newton's second law:

brainly.com/question/3820012

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