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Listed under:  Science  >  Forces and energy  >  Mechanical energy  >  Motion  >  Speed
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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.

Interactive

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 ...

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Ramps and rollers

This activity invites students to explore the phenomena of rolling objects down a ramp and investigate the question, 'What happens to a roller when you change the ramp by making it steeper?' Students experiment by rolling balls or cylinders down a ramp, and observe how the ramp's steepness affects how far their roller rolls ...

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Parachutes | Questacon

In this activity, students investigate the motion of falling objects, with and without a parachute. They explore whether different objects fall at different speeds and predict how different materials for making parachutes will perform. They then design, make and test their own toy parachutes. The activity includes a list ...

Interactive

Forces and Motion: Basics

This interactive simulation explores speed, acceleration and unbalanced forces in a simple system. In a series of simulations students identify when forces are balanced vs unbalanced; determine the net force on an object with more than one force acting on it; and predict the motion of an object with zero net force or given ...