Pulley
Lever- Wheel and Axle
Screw
Wedge
Inclined Plane
100
What does a pulley do?
It lets you to change the direction of the force required to lift it.
100
what is the formula for a lever?
100
What year was the screw invented?
1770
100
What simple machine can be used to split things apart & also it can hold a door open?
Wedge
100
What does an inclined plane look like from the side?
triangle
200
Who founded the pulley
Archimedes
200
What is the mechanical advantage for wheel and axle?
M.A = Radius of the wheel/radius of the axle = R/r.
200
what were screws used to do?
they were used as fasteners for fixing two relatively thin pieces of material together.
200
What is one purpose of the wedge?
To separate or cut through an object.
200
Is a staircase an inclined plane? Why or Why Not
Yes because in order to get to a higher level or another floor in a building or home, stairs become a plane traveled to accommodate the climb.
300
How do you find the velocity of a pulley?
Velocity ratio = diameter of the driven pulley ÷ diameter of the driver pulley.
300
Why don´t we just remove the wheel and turn the axle?
turning the axle directly requires too much effort
300
true or false the length around the threads of a screw as the length of an inclined plane and the length of the screw as the weight
false
300
How do you find the mechanical advantage of the wedge?
Find the ratio of the length of the slope to width of the slope.
300
What is a disadvantage of using an inclined plane to lift a heavy object?
The object must be moved a greater distance.
400
Three weights A, B and C of mass 2 kg each are hanging on string passing through a frictionless pulley. What is the tension in the string connecting weights B and C?
13N
400
A lever is used to raised a 12 kilograms mass with a effort that is only 4 kilograms. What is the mechanical advantage ?
3
400
A screw can be thought of as an inclined plane wrapped around a?
Cylinder
400
which of the following items are wedges?
the blade of a pizza cutter? a cusion? a pencil? a piece of pizza?
Blade of a pizza cutter
400
An inclined plane reduces the amount of force needed to move an object by
increasing the distance the object moves.
500
The mass of a body measured by a physical balance in a lift at rest is found to be m. If the lift is going up with an acceleration a, its mass will be measured as
m
500
third class levers give a speed advantage because they...
the move a load through a large distance than the effort moves the same time
500
what is the difference between a male and female screw? And what does the male thread do?
Male threads are on the outside, like a bolt. Female threads are on the inside, like a nut.
The male threads screw into the female threads.
500
is a tooth a wedge Why or Why not
Yes, it is able to split and or break things apart.
500
Students pulled the same mass up an inclined plane that was 20 cm, 30 cm, and 40 cm long. Each time, they used a spring scale to measure the force needed to pull the mass up the inclined plane. What did they conclude?
The least amount of force was needed on the 40 cm inclined plane.