7 Forces in Equilibrium

This is a unit where you can really go to town on the problems with the vectors. You must read the specification carefully and make sure that you don’t panic if you can’t do all the problems in the post. I have included lots of vector problems which go 360° where the exam board will tend to stick to 90° only to make it easier. However, I am in the business of teaching vectors in 2D and would say I would be a bad teacher to stop just because the exam board don’t do it. You will need the skills found here if you carry on to a Physics type job later on so why not learn now. Most students say it is really hard at first but then the exam is easy and they get it after a bit of graft!

Also you may find it hard to understand the idea that…

  1. A diagonal vector can be split into two parts the horizontal and vertical parts which can be treated separately.
  2. Two forces can be added together to make a resultant.
  3. An object not moving has a sum of all vertical forces as zero and also all horizontal forces as zero.

If you find this is hard keep going as it will click!

AS Unit 7 Physics Forces in Equi (Main PDF for Lessons)

7.1 Vectors and Scalars

7.1 Trig Problems (You must have these trig skills before you start the problems)

Unit_7_Statics_Dynamics_Vectors_1 (Easy problems sheet)

7_1_Wires Example (This is an example of resolving – hanging a picture)

Unit_7_Statics_Dynamics_Vectors_2 (Rock Hard Problems Sheet beyond AS/A2)

Youtube Video Tutorials “Vectors” – Steve4Physics

M01 Scalars and Vectors Introduction
M02 Vectors – Notation, Multiplication by a scalar
M03a Vectors – Addition and Subtraction 1 of 3
M03b Vectors Addition and Subtraction 2 of 3
M03c Vectors Addition and Subtraction 3 of 3
M04 Vectors -resolving into components
M05 Using vector components

7.2 Balanced Forces

7_2_Resultant Forces Problems (quick fun problems – no answers)

72_Practical_Coplanar_Forces (practical proving coplanar forces)

7.3 The principle of moments

7_3_Density_of_Ruler_Prac (Use moments to find out density of ruler)

7.4 More on moments

7_4_Bridge_Crane_Prac (Practical showing support forces)

7_4_Putting_Your_Foot_Down_Extension (Nice but more complex sheet on moments in your feet)

7.5 Stability

7.6 Equilibrium rules

7.7 Statics calculations

Youtube Video Tutorials “Statics” – Steve4Physics

M13a Introduction to Forces. Part 1 of 4. Weight
M13b Introduction to Forces. Part 2 of 4. Normal Reaction (normal force)
M13c Introduction to Forces. Part 3 of 4. Friction
M13d Introduction to Forces. Part 4 of 4. Tension and Compression.
M14a Moment of a force (torque). Part 1 of 3.
M14b-part a. Moment of a force (torque). Part 2a of 3. Centre of Gravity
M14b-part b. Moment of a force (torque). Part 2b of 3. The Principle of Moments

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