# Mass & Forces Welcome to the GCSE Physics Ninja Mass & Forces course.

These video lessons are based on question-and-answer flashcards. You can either make your own or purchase the printable flashcards from the shop.

 Mass & Weight Centre of Mass & Turning Forces 1. Mass vs. weight 30. Centre of mass 2. Weight 31. Finding the centre of mass 3. Weight equation 32. Symmetric objects centre of mass 4. Weight calculation 33. The turning effect of a force Forces & Newton's Laws 34. Moment equation 5. Three effects of forces 35. Moment calculation 6. Forces are vectors 36. Principle of moments 7. Newton's first law 37. Principle of moments calculation 1 8. Resultant force on a scooter 38. Principle of moments calculation 2 9. Resultant force calculation 39. Levers 10. Newton's second law 40. Two conditions needed for equilibrium 11. Newton's second law calculation 41. Why objects can fall over 12. Newton's law of force pairs 42. Stability of different objects Friction & Falling Objects 43. Self-righting toy 13. Friction Momentum 14. Frictional forces in a fluid 44. Momentum 15. Falling object in a fluid 45. Momentum calculation 16. Skydiver force arrows 46. Momentum in an explosion or collision 17. Skydiver motion 47. Ice hockey collision 18. Parachute force & motion 48. Crumple zones 19. A mouse and the Empire State building 49. Impulse equations Stopping Distance 50. Force of a cricket ball 20. Braking Pressure 21. Stopping distance 51. Pressure 22. Thinking distance 52. Pressure in liquids 23. Braking distance 53. Pressure equation Springs 54. Pressure calculation 24. Force - extension experiment 55. Pressure vs depth in a liquid 25. Different force - extension graphs 56. Pressure beneath a liquid 26. Spring equation 57. Submarine pressure calculation 27. Spring constant calculation 58. Gas pressure 28. Describing a force-extension graph 59. The barometer & atmospheric pressure 29. Elastic and plastic deformation 60. Liquid in a U-tube 61. Hydraulic machines

## What will I learn in this course?

When you have completed this course, you will be able to...

• Understand the difference between mass and weight.
• Explain the effects of forces.
• Calculate the resultant force on an object.
• Use Newton's laws to analyse the motion of an object subjected to forces.
• Explain the effect of friction forces on falling bodies.
• Understand the factors affecting stopping distance.
• Interpret force - extension graphs for different materials
• Calculate extension of a spring using Hooke's Law.
• Explain the difference between elastic and plastic deformation.
• Understand the term centre of mass and use it to determine the stability of objects.
• Explain and calculate the moment due to a force.
• Become familiar with the idea of momentum and its conservation.
• Be able to use impulse to calculate forces and time of impact.
• Explain how a force can cause pressure and perform calculations.
• Calculate pressure vs. depth in liquids.
• Use the idea of particles to describe how a gas exerts a pressure on the walls of a container.
• Understand how machines that use pressure can be force multipliers.