Question

question 2 *

1. the cart is traveling at a velocity of - 4.0 m/s. select the statements that best describes the motion of the cart.

a. the cart’s position changes by 4 meters to the right every second.
b. the cart’s position changes by 4 meters to the left every second.
c. the cart’s velocity changes by 4 m/s to the right every second.
d. the cart’s velocity changes by 4 m/s to the left every second.

question 3 *

1. a student claims that the cart is moving because it must be experiencing unbalanced forces. select the response that correctly evaluates this student’s claim.

a. the student is correct because only objects that are experiencing unbalanced forces can move.
b. the student is correct because an object experiencing balanced forces will remain at rest.
c. the student is incorrect because experiencing unbalanced forces can cause an object to come to rest.
d. the student is incorrect because objects moving at a constant velocity experience balanced forces.

Explanation:

Question 2:

Step1: Understand velocity sign

Velocity is a vector. A negative velocity indicates motion in the negative - direction. If we assume the positive direction to the right, a velocity of - 4.0 m/s means the cart moves 4 meters to the left every second.

Question 3:

Step1: Recall Newton's first law

According to Newton's first law, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. An object moving at a constant velocity has zero net force (balanced forces).

Answer:

Question 2: B. The cart’s position changes by 4 meters to the left every second.
Question 3: D. The student is incorrect because objects moving at a constant velocity experience balanced forces.