Length, Time & Motion

Welcome to the GCSE Physics Ninja Length, Time & Motion 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.

What will I learn in this course?

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

  • Become familiar with the quantities and units used to measure length, time and motion.
  • Measure short time intervals with reasonable accuracy.
  • Use a micrometer screw gauge to measure very small lengths.
  • Measure and calculate the density of a substance.
  • Understand how to interpret distance-time graphs and velocity-time graphs.
  • Calculate distance travelled, speed and acceleration of an object using a graph, or an equation.
  • Explain how objects can move in circular motion.
  • Perform calculations on simple pendulums.
  • Understand what vectors are, and how to find a resultant vector graphically.

Length, Time & Motion

Measuring QuantitiesVelocity-time graphs
1. Measurement units and quantities18. Gradient of a velocity-time graph
2. Power of ten notation19. Describing motion in a velocity-time graph
3. Measuring short time intervals20. Skydiver velocity-time graph
4. Measuring length, volume and time21. Acceleration gradient calculation
5. Using a micrometer screw gauge22. Distance travelled from a graph
6. Density calculation23. Distance travelled calculation
7. Gold nugget density calculation24. Freefall acceleration
8. Density of lead vs. mercuryCircular motion
Motion equations25. Moving in a circle
9. Speed vs. velocity26. Circular motion examples
10. Average speed equation27. Direction of centripetal force & acceleration
11. Average speed calculation28. Whirling a ball on a string
12. Acceleration equationSimple pendulum
13. Acceleration-calculation29. Simple pendulum time period & frequency
Distance-time graphs30. Simple pendulum calculation
14. Gradient of a distance-time graph31. Simple pendulum time period and length
15. Describing motion in a distance-time graph32. Simple pendulum measurements
16. The gradient of a straight lineVelocity vectors
17. Calculating speed from a distance time graph33. Quantities with magnitude and direction
34. Finding a resultant vector