Multiple chioce section for Phys 131 Exam #1

In science, and physics in particular, what is a model

A simplified picture of reality, but one that still captures the essence of what we want to study

The strength of the electric force exerted by one ion on another scales inversely as the square of the distance between the ions. Suppose the force between two ions is 1.00 nN. If the distance between the ions doubles, the force will be (3pts)

0.25 nN

A ball is tossed straight up in the air. At its very highest point, the ball’s acceleration vector

points down

The slope at a point on a position-time graph of an object is

the objects velocity at that point

A heavy red ball is released from rest 2.0 m above a flat, horizontal surface. At exactly the same instant, a yellow ball with the same mass is fired horizontally at 3.0 mis. Which ball hits the ground first? (2

they hit at the same time