Science / Year 7 / Science Understanding / Physical sciences

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Curriculum content descriptions

Change to an object’s motion is caused by unbalanced forces, including Earth’s gravitational attraction, acting on the object (ACSSU117)

Elaborations
  • investigating the effects of applying different forces to familiar objects
  • investigating common situations where forces are balanced, such as stationary objects, and unbalanced, such as falling objects
  • investigating a simple machine such as lever or pulley system
  • exploring how gravity affects objects on the surface of Earth
  • considering how gravity keeps planets in orbit around the sun
General capabilities
  • Literacy Literacy
ScOT terms

Motion

Moving Image

The physics of a slinky drop

Imagine holding a slinky by the top end, with the bottom end dangling in mid-air. What do you think would happen when you let it go? Explore the physics of two equal and opposing forces working on an object in this awesome experiment!

Moving Image

Do heavier things fall faster?

Will a medicine ball or a basketball hit the ground first when dropped at the same time from the same height? In this clip, Catalyst's Dr Derek Muller investigates what influences the speed at which objects fall. Derek challenges some people in a market to make a prediction and explain their thinking, before he finally ...

Tablet friendly (Interactive resource)

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 ...

Tablet friendly (Interactive resource)

Wild ride: get a grip

Investigate the role of friction in performance of bicycle tyres. Test how the type of tread affects grip and speed. Choose tyres best suited to track and weather conditions in a time trial. This learning object is one in a series of four objects.

Interactive Resource

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.

Interactive resource

Pulleys

Help warehouse workers lift crates by using a rope and pulleys. Explore relationships between mass, force, distance and work. Notice that pulleys change the direction of a force and make it easier to lift loads. Solve a range of lifting problems by using combinations of worker numbers (force) and pulley numbers. This learning ...

Tablet friendly (Interactive resource)

It's a drag

Investigate the braking efficiency of cars and trucks. Test stopping distances under controlled conditions. Compare effects of vehicle type, tyres, road surface and weather conditions. Choose driving speed, then apply brakes and compare stopping distances. Answer questions about friction, tyres and driver fatigue. This ...

Teacher resource

Backyard Science: forces

This resource, including student videos, provide opportunities for students to identify types of forces, determine whether forces are balanced or unbalanced and compare water and air resistance. They will conduct an investigation into the relationship between friction and different types of surfaces. Students will design, ...

Interactive resource

Wild ride: on a roll

Investigate the role of physical forces in how bicycle wheels work. Test how wheel size, tyre pressure, tread and load affect rolling resistance. Then choose wheels best suited to track conditions in a time trial. This learning object is one in a series of four objects.

Interactive resource

Pulleys: change the force

Help warehouse workers lift crates using a rope and pulleys. Explore relationships between mass, force, distance and work. Notice that pulleys change the direction of a force and make it easier to lift loads. Identify the number of workers needed to lift a range of weights. This learning object is one of three objects in ...

Interactive Resource

Friction

Students use this resource consisting of eleven slides with diagrams, written explanation and voice-over to understand how frictional forces, including air resistance, can affect the motion of an object. There is a two-question quiz and a summary slide.

Interactive resource

Wild ride: in top gear

Investigate how gears work and why you need them to ride a bicycle efficiently. Test how cog size affects speed and energy efficiency. Then choose gears best suited to track conditions in a time trial. This learning object is one in a series of four objects.

Moving Image

Friction: friend or foe?

What part does the force of friction play in our everyday lives? Friction can be an advantage (friend) or a problem (foe). Join interviewer Doug Traction and professors Static, Slide, Rolling and Fluid at the National Tribology Research Centre as they have forceful fun investigating friction. This video won a prize in the ...

Interactive Resource

Gravity and the Solar System

Students use this resource consisting of seven slides with diagrams, written explanation and voice-over to understand how the movement of planets around the sun is related to gravitational forces. There is a two-question quiz and a summary slide.

Moving Image

Effects of g-force on the human body

Peter Rowsthorn visits the Australian International Air Show to answer the question, 'What effect does g-force have on the human body?' Join Pete in the cockpit of a light plane for some aerobatics with pilot David Pilkington. G-force expert Dr David Newman explains the science as Pete endures up to 6 g in the aircraft.

Interactive Resource

experiMENTALS: Magic rocking candle

This resource contains a materials and instruction list and brief explanation for students about the process of burning both ends of a balancing candle. This activity is most likely to be done as a teacher demonstration for safety and classroom management reasons, particularly at primary school level.

Interactive Resource

Sites2See: Surf safety

A webpage about surfing safety, dangerous waves and rips, and the history and science of surfing. A 'For Kids' section provides games and quizzes for young swimmers and surfers.

Interactive Resource

Gravity

Students use this resource consisting of four slides with diagrams, written explanation and voice-over to understand that gravity is a force of attraction which acts on Earth towards the centre of the planet, and that the size of the force of gravity depends on the mass of each object and the distance between them. There ...

Interactive resource

EagleCat: gears

Explore the relationships between cog size, speed, direction of motion and gear ratios. Change the settings on four interlocking cogs. For example, change the number of teeth on a green cog and look at its effect on an interlocking red cog. Answer questions about gear ratios. Look at different cog combinations to answer ...

Assessment resource

Wild ride: get a grip: assessment

Assess your ability to conduct a test, collect data and make predictions. Also assess your understanding of how friction affects bicycle tyre performance. Test the friction force applied by bicycle tyres under different conditions and record the data in a notebook. Use the collected data to select the correct tyre to use ...