# Physics Review - Basic Introduction | Summary and Q&A

915.1K views
January 2, 2017
by
The Organic Chemistry Tutor
Physics Review - Basic Introduction

## TL;DR

This video provides a brief overview of various physics topics including unit conversion, kinematics, vectors, projectile motion, forces, energy, and rotational motion.

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### Q: How can you convert grams to kilograms?

To convert grams to kilograms, divide the number of grams by 1000. For example, if you have 470 grams, divide it by 1000 to get 0.47 kilograms.

### Q: What is the difference between distance and displacement?

Distance is the total length traveled, while displacement is the change in position from the starting point to the end point. Displacement includes both the magnitude and direction of the movement.

### Q: How do you calculate average speed?

Average speed is calculated by dividing the total distance traveled by the total time taken. For example, if you traveled 100 miles in 2 hours, your average speed would be 50 miles per hour.

### Q: What is the formula for calculating acceleration?

The formula for acceleration is acceleration = change in velocity / change in time. It shows how fast an object's velocity is changing over time.

### Q: How does friction affect motion?

Friction opposes motion and can either stop or slow down an object's movement. It increases when the surfaces are rough and decreases when they are smooth. Friction can be beneficial, such as when it allows us to walk without slipping, or it can be detrimental, such as when it causes wear and tear on machinery.

## Summary & Key Takeaways

• The video introduces basic concepts in physics such as unit conversion, kinematics, vectors, projectile motion, forces, energy, and rotational motion.

• It provides examples and practice problems for unit conversion, converting centimeters to meters, kilometers per hour to meters per second, and other conversions.

• The video explains the difference between distance and displacement, and how to calculate average speed and average velocity.

• It covers key principles of acceleration, including calculating acceleration using Newton's second law and understanding the relationship between velocity, acceleration, and mass.