# Ch 21: Force & Motion

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### About This Chapter

## Force & Motion - Chapter Summary

This collection of lessons explains the subtle difference between distance and displacement, as well as the difference between speed and velocity. You will review how to measure the speed of an object as well as calculate the average speed. The commonly used graphs in physics will also be introduced, in addition to the concepts of impulse and harmonic motion.

The chapter continues with acceleration, how it compares to velocity and speed, and how to calculate it. Then, you will move on to more advanced acceleration topics, including constant acceleration, the acceleration of gravity, and terminal velocity. After reviewing this chapter, you should be able to:

- Differentiate between distance and displacement
- Tell the difference between speed and velocity
- Calculate average speed
- Compare a force-time graph to a force-distance graph
- Measure acceleration using a mathematical formula
- Understand acceleration on a velocity vs. time graph
- Explain the concept of constant acceleration
- Know what the concept of kinematics is
- Use a specific method to calculate the speed of a falling object

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### 1. Distance and Displacement in Physics: Definition and Examples

Distance and displacement might seem like similar terms but in physics, understanding the difference can mean getting a question right instead of wrong. In this lesson, we will define these terms and illustrate how easy it is to confuse the two.

### 2. Speed and Velocity: Difference and Examples

Is it possible to drive with a speed of 100 mph but a velocity of 0? In this lesson, we will examine the difference between speed and velocity and use that information to answer this question.

### 3. Measuring the Speed of an Object: Physics Lab

After watching this video, you will be able to explain what the speed of an object is and how to calculate it in real life situations. A short quiz will follow.

### 4. Calculating Average Speed: Formula & Practice Problems

In this lesson, you will learn how to calculate the average speed of an object. Diagrams, graphs, and examples will help you understand this concept and its method of calculation.

### 5. Force vs. Time & Force vs. Distance Graphs

In this lesson, you'll find out how to determine impulse from a force-time graph and speed from a distance-time graph. You'll also learn how to describe the general shape of these graphs for simple harmonic motion.

### 6. What is Acceleration? - Definition and Formula

This lesson describes the difference between speed, velocity and acceleration. Examples are used to help you understand the concept of acceleration and learn to calculate acceleration with a mathematical formula.

### 7. Using Velocity vs. Time Graphs to Describe Motion

In this lesson, we will look at an example of a velocity vs. time graph. By examining the shape of the graph, it is possible to accurately describe the motion of an object, even if that motion is very complex.

### 8. Determining Acceleration Using the Slope of a Velocity vs. Time Graph

In this lesson, we will learn how to use the slope of the line on a velocity vs. time graph to calculate the acceleration of an object in straight line motion.

### 9. Introduction to Constant Acceleration

The most useful type of motion in physics is that of constant acceleration. In this lesson you will learn about constant acceleration, why it is important, and an example of motion that undergoes constant acceleration.

### 10. The Acceleration of Gravity: Definition & Formula

In this lesson, we will introduce the acceleration due to gravity. Objects in free fall are one of the few real world examples of straight line motion with constant acceleration, so they are commonly used when learning kinematics.

### 11. What is Terminal Velocity? - Definition, Formula, Calculation & Examples

In this lesson, we will learn about terminal velocity and why it is better to jump out of a plane with a parachute than without one. We will explore why objects fall at different speeds and how to calculate the maximum speed of a falling object.

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### Other Chapters

Other chapters within the GCSE Physics: Practice & Study Guide course

- The Process of Scientific Thinking
- Steps of the Scientific Method
- Analyzing & Evaluating Scientific Data
- Scientific Vocabulary & Measurement
- System Energy & Power
- Conservation & Dissipation of Energy
- Global Energy Sources
- Electric Currents, Resistance & Potential Difference
- Understanding Circuit Theory
- Electrical Energy Transfer
- Static Electricity
- States of Matter & Phase Changes
- Internal Energy & Energy Transfers
- Gas Properties & Laws
- Atomic Structure & Development of Atom Models
- Atoms & Nuclear Radiation
- Uses & Hazards of Nuclear Energy
- Forces & Their Interactions
- Moments, Levers & Gears
- Pressure & Pressure Differences in Fluids
- Understanding Newton's Laws of Motion
- Forces Involved in Braking
- Understanding Momentum
- Wave Properties & Parameters
- Understanding Electromagnetic Waves
- Magnets & Electromagnetism
- Space Physics