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Listed under:  Science  >  Mechanical energy  >  Motion  >  Speed

### TIMES Module 21: Number and Algebra: rates and ratios - teacher guide

This is a 17-page guide for teachers. This module introduces the idea of ratios and rates. Ratios are used to compare two quantities. The emphasis is usually on comparing parts of the whole. Rates are a measure of how one quantity changes for every unit of another quantity. It relates the ideas of ratios, gradient and fractions.

### Measuring Speed

Students use this resource consisting of eleven slides with diagrams, written explanation and voice-over to understand how to work out the speed of a moving object and understand how to make calculations using the relationship between speed, distance and time. There is a two-question quiz and a summary slide.

### Measuring Speed (Simulation)

Students use this resource consisting of a webpage with diagrams of three cars that students can vary the speed at which they are travelling. They can calculate the time to travel 3000m and then observe the cars as they travel the distance. This demonstrates how to work out the speed of a moving object and how to make calculations ...

### Factors that Affect Braking Distance

Students use this resource consisting of ten slides with diagrams, written explanation and voice-over to understand that the braking distance of a car depends on its speed and other factors which affect the frictional forces needed to stop the car. There is a two-question quiz and a summary slide.

### Distance-time Graphs

Students use this resource consisting of ten slides with diagrams, written explanation and voice-over to understand how to plot a distance-time graph and understand what it shows. There is a two-question quiz and a summary slide.

### Give me a brake

Investigate braking efficiency of cars and trucks by testing stopping distances under controlled conditions. Test effects of vehicle type, tyres, road surface and weather conditions. Choose driving speed, then apply brakes and compare stopping distances. Estimate distances from target markers. Answer questions about antilock ...