# Search results

## Refine by topic

Main topic
Specific topic
Related topic
Listed under:  Science  >  Mechanical energy  >  Friction

### Balloon car challenge

In this practical activity, students design and build a balloon-powered car and race it to better understand the ideas related to rocket propulsion. The resource includes a step-by-step teacher guide and student worksheets.

### Friction

In this learning sequence, students explore frictional forces. They investigate how friction changes with different contact surfaces in wet, dry and icy conditions, and the effect this has on braking. Finally they apply this learning to the real-world situation of tram travel, and explore why sand is used on tram tracks ...

### Useful Friction

Students use this resource consisting of six slides with diagrams, written explanation and voice-over to understand how friction is needed in movement and braking. The fact that friction produces heat and causes wear is also mentioned. There is a two-question quiz and a summary slide.

### Factors Affecting Thinking Distance

Students use this resource consisting of nine slides with diagrams, written explanation and voice-over to understand that the stopping distance of a car depends on the alertness of the driver as well as its speed and frictional forces. There is a two-question quiz and a summary slide.

### Stopping Distances: animation

Students use this resource consisting of a webpage in which students can vary either the vehicle (car or truck) and the road surface (dry, wet, icy) to explore the effect on stopping distance. This could be used as an introduction to friction.

### experiMENTALS: Keys on a shoelace

This resource contains a materials and instruction list and brief explanation for students to show that keys on a shoelace can do some unexpected things.

### 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 ...

### Air-raid shelter in Brisbane, 1942

This black-and-white photograph shows two women and two uniformed servicemen in a backyard featuring a homemade air-raid shelter during the Second World War. The two men, Private Dick of the AIF and US soldier Tom Squires, are standing in the shelter with Anthea Dyke while Doreen Smythe is jokingly pointing a hose at them. ...

### Judge Kevin Parker talks about 'beyond reasonable doubt', 2008

This is an edited sound recording of Kevin Parker, vice-president of the International Criminal Tribunal for the former Yugoslavia (ICTY), outlining the process of reaching a judgement. Parker stresses that a guilty verdict can only be based on a case being proven 'beyond reasonable doubt' through evidence brought before ...