Question

there are five questions for this scenario.
a person is pushing a 75 kg bookshelf across a floor in a room on earth. the room is filled with air.
the bookshelf is moving at a constant velocity of 4 m/s to the left.
bookshelf moving to the left
(b) the 75 kg bookshelf is moving to the left at a constant velocity. what is the net force on the bookshelf?
a) 7.5 n
b) 750 n
c) 300 n
d) 0 n
e) 4 n
f) 75 n

Explanation:

Step1: Recall Newton's First Law

Newton's First Law states that an object in motion with constant velocity (or at rest) has a net force of zero acting on it, because acceleration \(a = 0\) (since velocity is constant). The formula for net force is \(F_{net}=ma\), where \(m\) is mass and \(a\) is acceleration.

Step2: Determine Acceleration

The bookshelf is moving at a constant velocity, so its acceleration \(a = 0\space m/s^2\).

Step3: Calculate Net Force

Using \(F_{net}=ma\), substitute \(m = 75\space kg\) and \(a = 0\space m/s^2\). Then \(F_{net}=75\space kg\times0\space m/s^2 = 0\space N\).

Answer:

D. 0 N