About This Chapter
Praxis General Science: Mechanics - Chapter Summary
Refresh your memory of mechanics by studying the material in this chapter. When you review the text and video lessons, you can expand your knowledge of kinematics and various kinds of motion. In addition, you'll be reminded of how to solve equations for torque, acceleration and linear momentum. Utilizing this chapter to study for the Praxis General Science examination can help you to:
- Define scalars and vectors
- Solve problems related to torque
- Understand linear momentum and conservation of linear momentum
- Explain Newton's laws of force, motion, weight and gravity
- Discuss examples of simple machines
Review the fundamentals of mechanics from this chapter's text and video lessons, all of which include a quiz and worksheet. Accessible 24/7 via your mobile device, the lessons are presented to you by qualified educators. Use the video tags along with the play and pause features to navigate the lessons.
1. Kinematics: Displacement, Velocity & Acceleration
Discover the differences between displacement, velocity and acceleration: three of the most important terms in kinematics, which are easy to mix up. Answer questions to test your knowledge.
2. Motion: Linear, Simple Harmonic, Circular & Projectile
While you may be able to define 'motion' as it relates to science, do you know how simple harmonic, circular, linear and projectile motion differ from one another? Continue reading to find out more about these different types of motion, and then see if you can answer the questions on the follow-up quiz.
3. Linear Momentum: Definition, Equation, and Examples
Any moving object has momentum, but how much momentum it has depends on its mass and velocity. In this lesson, you'll identify linear momentum, as well as see examples of how an object's momentum is affected by mass and velocity.
4. Conservation of Linear Momentum: Formula and Examples
The law of conservation of momentum tells us that the amount of momentum for a system doesn't change. In this lesson, we'll explore how that can be true even when the momenta of the individual components does change.
5. Scalars and Vectors: Definition and Difference
In this lesson, we will examine scalars and vectors, learn why it is important to know the difference between the two and why remembering to add a direction to many of your exam answers could be the reason you get it right or wrong.
6. Newton's Laws of Force & Motion
Newton's laws of motion explain why we observe the motion we do in the world around us - they explain how forces work. In this lesson, we take a look at each of Newton's laws one by one.
7. Newton's Laws and Weight, Mass & Gravity
Did you know that mass and weight are not the same? This lesson describes the difference between the two as well as the effect of gravity on weight. Examples are used to teach you how to calculate weight based on mass and acceleration of gravity.
8. What Are Simple Machines? - Definition, Types & Examples
If you need to move or lift a heavy object, it would be wise to use a simple machine. Though these devices are far from fancy or high-tech, they are extremely helpful for getting work done.
9. Torque in Physics: Equation, Examples & Problems
After watching this video, you will be able to explain what torque is and use an equation to calculate torque in simple situations. A short quiz will follow.
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