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43 Cards in this Set
- Front
- Back
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A machine is...
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something we use to make work easier
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There are two types of machines, _________ and __________
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simple and complex
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Simple machines have...
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few or no moving parts
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Complex machines are...
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made up of simple machines and need energy to work.
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What simple machine uses a wheel and rope to lift and lower objects?
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A pulley
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An _________ is a slanting surface that connects a low level with a high level.
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inclined plane
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Which simple machines lift, lower or move objects?
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Pulleys, inclined planes, wheel & axel, lever & fulcrum, screw
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A _____ is used to hold things together or lift objects.
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screw
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A screw is also a type of _________.
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inclined plane
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What are a wheel and axel?
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A wheel is a circular object that turns around an axel. We use it to move or lift objects.
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We use a ____ to cut objects. It has at least one slanting edge.
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wedge
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A lever is...
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a ridgid bar with a support called a fulcrum. We use it to lift or move objects.
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Energy to power complex machines can come from...
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people, electricity or fuel.
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We use __________ to change direction when we ride a bicycle.
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handlebars
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Name the levers on a bicycle.
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Handlebars, pedals and brake levers
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What do you use to stop a bicycle?
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The brake levers and breaks
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Gears are ______ that do what?
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Pulleys. The force from them travels along the chain to the back wheel.
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Everything we can see, touch, taste, smell and has a mass and volume is made up of _____.
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Matter
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Mass is...
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How much matter an object has. We can measure it in grams and kilograms.
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Volume means...
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the amount of space that matter takes up
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What are the three states of matter?
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Solid, liquid and gas
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Which state of matter has a definite shape and volume?
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Solids
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Which state of matter only has a definite volume?
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Liquids
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Which state of matter expands to fill its container and has no definite shape or volume?
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Gas
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The word for "to get larger in size or volume" is...
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Expand
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When matter changes shape and state, we call it a ___________ change.
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physical
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A physical change can happen when we do what things to a substance?
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Heat, freeze, bend, twist, stretch or squash an object.
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When a new substance is produced, we call this a _________ change.
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chemical
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A mixture is...
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something that contains two or more substances.
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A heterogeneous mixture is...
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a mixture where it's easy to see the different substances.
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A homogeneous mixture is...
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a mixture where you can't see the different substances.
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A ______ material is difficult to break.
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resistant
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A _____ material can bend easily.
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flexible
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A _____ material breaks easily if we try to change its shape.
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fragile
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A ______ material doesn't bend easily.
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rigid
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An ______ material returns to its orginal shape after we bend or stretch it.
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elastic
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When water can't pass through an object, the object is...
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waterproof
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We can pass light through _______ objects.
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transparent
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Heat conductors are...
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materials that heat passes through easily.
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Heat insulators are...
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materials heat can't pass through easily.
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The three Rs are...
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reduce, reuse and recycle.
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Natural materials can come from...
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animals, plants, or minerals.
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Manufactured materials come from...
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materials that are transformed in a manufacturing process.
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