The wheel and axle increases your force over a longer distance.
100
A fixed pulley does not change the amount of force applied. What does it change?
the direction of the force
200
When does a wedge work?
When forces are applied.
200
What part of a lightbulb is a screw?
The end that does not light up.
200
What is a lever?
A lever is a rigid bar that is free to pivot, or rotate, on a fixed point (fulcrum).
200
What is a wheel and axle?
A wheel and axle is a simple machine made of two cylindrical objects fastened together that rotate around a common axis.
200
What type of pulley does a crane use?
Block and tackle
300
What is a wedge?
A wedge is a device that is thicker at one end and thinner at the other, or two inclined planes back to back.
300
How does a screw work?
The threads of a screw act like an inclined plane to increase the distance over which you exert the input force, As the threads of the screw turn, they exert an output force on the wood, pulling the screw into the wood.
300
How is a lever classified?
Levers are classified according to the location of the fulcrum, input force, and output force.
300
When you use a screwdriver, do you apply an input or output force to the handle?
input force
300
What is the mechanical advantage of a block and tackle?
3
400
Which wedge has a greater mechanical advantage: a long thin knife or a short thick knife?
The long thin knife has the greatest mechanical advantage.
400
What holds a screw in the wood?
friction between the wood and the screw
400
What kind of lever is the biceps and elbow?
Third-class
400
Find the mechanical advantage with the wheel radius being at 50 centimeters and the axle radius being at 25 centimeters.
2 centimeters
400
A pulley is attached to the object being moved. What kind of pulley is it?
moveable pulley
500
Tell how to figure the mechanical advantage.
The length divded by the width.
500
How is the mechanical advantage figured?
The length around the treads divided by length of screw.
500
Tell how to find the mechanical advantage of a lever.
Distance from fulcrum to input force divided by the distance from fulcrum to output force.
500
Tell how the mechanical advantage is figured for a wheel and axle.
radius of wheel divided by the radius of the axle.
500
How do you find the mechanical advantage of a pulley?
The mechanical advantage of a pulley is equal to the number of sections of rope that support the object.