Forces, Movement, Shape And Momentum
Overview
Forces are at the heart of physics. They change an object's speed, direction or shape, and understanding how forces combine is essential for predicting what happens when you push, pull, brake or fall.
In this lesson you will learn about different types of force, scalar and vector quantities, resultant forces, Newton's second law (F = ma), weight and gravitational field strength, stopping distance, terminal velocity, Hooke's law and elastic behaviour.
Objectives
- Describe the effects of forces between bodies such as changes in speed, shape or direction
- Identify different types of force such as gravitational or electrostatic
- Understand how vector quantities differ from scalar quantities
- Understand that force is a vector quantity
- Calculate the resultant force of forces that act along a line
- Know that friction is a force that opposes motion
- Know and use the relationship: force = mass x acceleration
- Know and use the relationship: weight = mass x gravitational field strength
- Know that the stopping distance of a vehicle is made up of the sum of the thinking distance and the braking distance
- Describe the factors affecting vehicle stopping distance
- Describe the forces acting on falling objects and explain why falling objects reach a terminal velocity
- Investigate how extension varies with applied force for helical springs, metal wires and rubber bands
- Know that the initial linear region of a force-extension graph is associated with Hooke's law
- Describe elastic behaviour as the ability of a material to recover its original shape after deformation forces are removed
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Forces, Movement, Shape And Momentum. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- A force can cause a change in: A) Mass only B) Speed, direction or shape C) Temperature only D) Density only Answer: B
- The resultant force on a stationary object is: A) Equal to its weight B) Zero C) Equal to friction D) Infinite Answer: B
- Which equation relates force, mass and acceleration? A) W = mg B) F = ma C) v = u + at D) P = mv Answer: B
- Terminal velocity occurs when: A) Weight exceeds drag B) Drag exceeds weight C) Drag equals weight D) Both forces are zero Answer: C
- Hooke's law applies: A) At all forces B) Only beyond the elastic limit C) Within the elastic limit D) Only to metals Answer: C
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Practice Mock Questions
Want to practice mock questions on Forces, Movement, Shape And Momentum? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
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