Newton's First & Second Laws Video Lessons

Concept

# Problem: Which of the following examples describes a situation where a car is experiencing a net force? a. The car is holding constant speed down a straight hill because the driver is applying the brakes. b. The car is moving at constant speed in a straight line. c. The car is holding constant speed around a curve. d. The car is stopped on a hill.

###### FREE Expert Solution

We'll need to apply Newton's first law to identify the situation with a net external force.

Newton's first law: An object remains in its state of uniform motion unless acted on by an external force.

An object at rest remains at rest or if in motion, remains in motion at a constant speed in a straight line unless acted on by a net external force.

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###### Problem Details

Which of the following examples describes a situation where a car is experiencing a net force?

a. The car is holding constant speed down a straight hill because the driver is applying the brakes.

b. The car is moving at constant speed in a straight line.

c. The car is holding constant speed around a curve.

d. The car is stopped on a hill.