opposite poles of magnets, attract each other, repel each other , same poles of magnets , attract each other , repel each other, Contact forces only work if the objects touch, false, true, Non- contact forces work without the objects touching , false , true , magnets is a contact force, false , true , gravity is a non- contact force, true, false , pressing a button is a contact force, false , true, electrostatic force is a , contact force , non- contact force, opening a door and throwing a ball is a , non- contact force , contact force, mop, knife, ruler, thermometer, screwdriver is an example of , tools, complex machine, machines can help us , move things, lift things, carry things, build or make things , read a story and sing a song, a screw is…, two inclined planes joined together, an inclined plane around a cylinder , a wheel and axle , is a surface that connects a higher point to a lower point , consist of two parts., a pulley is…, a wheel with a rope or chain around it, an inclined plane around a cylinder , a wedge is…, consist of two inclined planes joined together , a solid bar that rests on a fulcrum, sn inclined plane is…, consist of two parts, a surface that connects a higher point to a lower point , a lever , has got a solid bar that rests on a fulcrum , a wheel with a rope or chain , a wheelbarrow and scissors are , simple machine , complex machine , The difference between simple and complex machines is that a complex machine consists of two or more simple machines working together., true, false , help us find information more quickly , planes , wheels and axels, computers and internet, light bulbs , helped us communicate easily with people far away, fridges, telephones and mobile phones, radio and television , steam engines, helped us transport things over long distances , wheel and axels, computers and internet , washing machines , mobile phone , helped us see at night, internet, planes , television , light bulbs , important for sharing information , household machines , radio and television , steam engines , wheels and axels, helped people save time, fridges, washing machines, dishwashers and irons, light bulbs , mobile phones , planes, helped us travel to other countries faster , telephones , dishwashers, computer , planes , people used it to power large machines in factories , steam engines , radio , internet , irons .

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