Year 7 Semester 2 Revision PHYSICS: 1. Define Force and what unit is it measured in __________________________________________________________________________________ __________________________________________________________________________________ 2. Define and give examples of: Balanced force:______________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ Unbalanced force:____________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ 3. Calculate net force for the following, indicating which direction the object will move 4. Explain what friction is using a real world example:______________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ 5. How could you reduce the amount of friction between two surfaces? _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ 6. Simple machines makes doing work easier by reducing the amount of force needed. Give an example where using a simple machine would be beneficial. _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ 7. Use the word bank below to name the simple machine in each picture EARTH AND SPACE: 8. In the table below explain what a natural and synthetic resource is and give at least 1 example Natural Resources Explanation Synthetic Resources Explanation Examples Examples 9. Identify what kind of eclipse is occurring below: a. Name:____________________________________ b. What we see: _______________________________ c. Name:__________________________________ d. What we see:____________________________ 10. When is the Earth tilted towards the sun what season do we experience? ___________________________________________________________ 11. Fill in the gaps using the missing words: Earth seasons high equator degree two tilt Tides winter towards hours hotter rays gravitational a. The ___________ interaction between the ________ and Moon causes__________. In 24 ________we experience 2 _______tides and _____ low tides. b. The Earth is on a 23.5_________tilt. This ____ is the reason why we experience ________, when the Earth is tilted _________ the Sun we experience Summer and when the Earth is tilted away, we experience _________. c. The ___________ is an imaginary line running horizontally through the center of the Earth. It is _________ at the equator because it is always facing the suns _________. 12. Complete the table below explaining what renewable energy and nonrenewable energy is then list three examples for each. Renewable NonRenewable Examples Examples 13. Label the different moon phases below using the words in the box. Some words you may need to use more than once. Year 7 Semester 2 Revision PHYSICS: 14. Define Force and what unit is it measured in force is a push or pull that is measured in newtons 15. Define and give examples of: Balanced force: balanced force is when two forces are the same, e.g. a ball sitting on a desk or a car moving at constant speed Unbalanced force: Unbalanced force is when two forces are acting with different amounts e.g. one person pulls on a string harder than another person, a ball slowing down 16. Calculate net force for the following, indicating which direction the object will move 6 + 3 = 9N Right 5 – 4 = 1N Left 2 + 4 – 5 = 1N Right 17. Explain what friction is using a real world example: Friction is the force that opposes motion, it works in the opposite direction to the movement of an object. When a car drives along the road, the road and air supply friction which can stop the car from moving 18. How could you reduce the amount of friction between two surfaces? To reduce friction you can add oil, water or a layer or air between the surfaces, use balls or rollers 19. Simple machines makes doing work easier by reducing the amount of force needed. Give an example where using a simple machine would be beneficial. Lifting a fridge onto a truck, moving a heavy object, chopping wood etc. 20. Use the word bank below to name the simple machine in each picture Pulley Wheel and axel lever inclined plane screw wedge EARTH AND SPACE: 21. In the table below explain what a natural and synthetic resource is and give at least 1 example Natural Resources Explanation Natural resources are found in nature Synthetic Resources Explanation Synthetic resources are man made Examples Wind, water, biomass, sun Examples Plastic 22. Identify what kind of eclipse is occurring below: e. Name: lunar eclipse f. What we see: no moon or a dark reddish moon g. Name: solar eclipse h. What we see: no sun, ring of light around the moon 23. When is the Earth tilted towards the sun what season do we experience? summer 24. Fill in the gaps using the missing words: Earth seasons high equator degree two tilt Tides winter towards hours hotter rays gravitational d. The gravitational interaction between the Earth and Moon causes tides. In 24 hours we experience 2 high tides and two low tides. e. The Earth is on a 23.5 degree tilt. This tilt is the reason why we experience seasons, when the Earth is tilted towards the Sun we experience Summer and when the Earth is tilted away, we experience winter. f. The equator is an imaginary line running horizontally through the center of the Earth. It is hotter at the equator because it is always facing the suns rays. 25. Complete the table below explaining what renewable energy and nonrenewable energy is then list three examples for each. Renewable Renewable energy sources are sources that have unlimited amount of supply and are derived from natural resources Examples Wind, water, solar, geothermal NonRenewable Non-renewable resources are resources that only have limited supply and will eventually run out Examples Oil, coal, nuclear 26. Label the different moon phases below using the words in the box. Some words you may need to use more than once. Half moon crescent moon gibbous moon full moon New moon crescent moon gibbous moon Half moon *Take note 1. Disadvantages of wind power a. Needs to be located somewhere with constant wind b. Can be noisy c. Threat to wildlife 2. Gases in the atmosphere that can absorb heat are called greenhouse gases 3. The relationship between seasons in the southern hemisphere and the northern hemisphere is that they will be opposite. When the south experiences summer the north will experience winter
