| Forces | Forces opposing motion | Simple Machines | More about machines! | Work |
|---|---|---|---|---|
100What is the newton?
This is the unit for force.
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100What is friction?
This is a force that opposes motion.
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100What is second class lever?
a wheel barrow is an example of this type of lever.
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100What is MA=1 and a pulley?
A machine that only changes the direction of a force has a mechanical advantage equal to ________. What is an example of this machine?
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100What is power (work divided by time)?
The rate at which work is done.
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200What is unbalanced force?
This is the type of force that causes motion. When the scale is tipped the object moves!
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200What is ice?
Walking on this surface produces little friction because it is so smooth.
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200What is a lever?
This machine is composed of a ridgid rod or plank moving around a fixed point.
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200What is a wedge?
This machine is an inclined plane with one or two sloping sides. It is used for seperating objects.
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200What is the movement of on object?
This is an example of work being done.
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300What are your hand and gravity?
When you throw a coin into the air, these are the forces acting on it as it leaves your hand.
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300What is efficiency?
A machines ___________ is reduced by friction.
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300What is an inclined plane?
A winding mountain road is an example of this simple machine.
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300What is a screw?
This is a simple machine with a groove wrapped around it.
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300What is perpendicular?
No work is done when a force is _________ to the direction of motion.
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400What are contact forces?
These are forces that result from two objects that are touching.
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400What is a gravity?
This is the force that pulls objects downward.
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400What is mechanical advantage?
The force output of a machine divided by the force input is the ______ of a machine.
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400What is mechanical advantage?
This is the amount of times a machine multiplies an input force.
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400What is 15j?
This is how much work is done if a teacher lifts 3N of books 5m onto a shelf.
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500What are magnetic forces?
This is an example of a non-contact force. It is the reason why magnets stick to your refrigerator.
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500What is thermal energy (heat)?
When machines do work, some of the input work is converted into this.
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500What is they all have a fulcrum?
this is why these three machines are basically the same: lever, pulley, wheel and axle.
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500What is wheel and axle?
Door knobs and bicycle wheels are examples of this simple machine.
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500What is 140j?
This is how much work is done if a baseball player throws a 7N baseball 20m.
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