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