Question

you can complete this review up to 3 times. it will be worth 2.5 points extra credit onto the exam.
question 4
1 pts
a train moves along its track at a constant speed in the same direction over time. select all statements below that apply to the train.
the train is in equilibrium
the net force o the train is non - zero.
the train is not in equilibrium
the net force on the train is equal to zero.

Explanation:

Step1: Recall Newton's First Law

Newton's First Law states that an object in motion with constant velocity (constant speed in a straight line) has a net force of zero and is in equilibrium. A train moving at constant speed in the same direction has constant velocity.

Step2: Analyze each statement

• "The train is in equilibrium": Since velocity is constant, net force is zero, so it is in equilibrium. This is correct.
• "The net force on the train is non - zero": Constant velocity means acceleration \(a = 0\). From \(F_{net}=ma\) (Newton's Second Law), \(F_{net}=0\). So this is incorrect.
• "The train is not in equilibrium": As we saw, net force is zero, so it is in equilibrium. This is incorrect.
• "The net force on the train is equal to zero": Using \(F_{net}=ma\) and \(a = 0\) (constant velocity), \(F_{net}=0\). This is correct.

Answer:

The train is in equilibrium, The net force on the train is equal to zero.