Mechanics: Newton's Laws of Motion

Newton's Laws of Motion: Audio Guided Solution

Extra Problem 14:

A train has a mass of 6.37x10⁴ kg and is moving with a speed of 94.8 km/hr. The engineer applies the brakes which results in a net backward force of 2.45x10⁵ Newtons on the train. The brakes are held for 3.4 seconds. How far (in meters) does the train travel during this time?

Audio Guided Solution

Habits of an Effective Problem Solver

• Read the problem carefully and develop a mental picture of the physical situation. If necessary, sketch a simple diagram of the physical situation to help you visualize it.
• Identify the known and unknown quantities in an organized manner. Equate given values to the symbols used to represent the corresponding quantity - e.g., m = 3.52 kg; a = 4.2 m/s/s; F_net = ???.
• Use physics formulas and conceptual reasoning to plot a strategy for solving for the unknown quantity.
• Identify the appropriate formula(s) to use.
• Perform substitutions and algebraic manipulations in order to solve for the unknown quantity.

Read About It!

Get more information on the topic of Wave Basics at The Physics Classroom Tutorial.

• Forces
• Mass and Weight
• Newton's Second Law
• Determining Acceleration From Force Values
• Determining Individual Force Values
• Friction Force
• The Kinematic Equations

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