Question

1. the student below is pushing a heavy box across the floor. which of the following statements best describes the force represented by the arrow and its effect on the box’s motion? a. it is a non - contact force that pulls the box down. b. it is a contact force that opposes the box’s motion. c. it is a contact force that adds to the object’s forward motion. d. it is a non - contact force that attracts the box toward other objects. 16. four identical drones are flown at different altitudes (height from earth’s surface) as shown in the data below. which drone experiences the greatest gravitational attraction towards the earth? a. drone a b. drone b c. drone c d. drone d 17. abed measures the weight of four unknown samples that have the same volume. using the table below, which statement best describes the masses of the samples? a. sample 2 has the greatest mass.

Explanation:

15.

The student is pushing the box forward. The force shown is likely the pushing force which is a contact - force and adds to the object's forward motion. Non - contact forces like gravity or magnetism are not relevant here as the arrow represents the push.

The gravitational attraction between an object and the Earth decreases as the altitude of the object increases. Among the drones, the one at the lowest altitude will experience the greatest gravitational attraction. Drone A has the lowest altitude.

Weight \(W = mg\) (where \(m\) is mass and \(g\) is the acceleration due to gravity, \(g\approx9.8m/s^{2}\) on Earth). Given the same \(g\), the sample with the greatest weight has the greatest mass. Sample 3 has the greatest weight (\(0.29N\)) among the four samples.

Answer:

C. It is a contact force that adds to the object’s forward motion.

16.