Important Terms
The point at which a lever pivots.
Fulcrum
Third
What is the IMA of a block and tackle with one moveable pulley and two fixed pulleys?
3
(true or false) IMA is always less than AMA.
False
Screw
The tendency of an object to resist a change of motion. Also causes "whiplash".
Inertia
What type of energy do plants provide for themselves and those who eat them?
Chemical
What simple machines make a pair of scissors?
With this class of lever, the effort is between the fulcrum and the resistance force.
Third-class
The force needed to do the same work with a machine.
Effort Force
If the area over which a force is exerted increases, what happens to pressure?
It decreases
This is the force needed to do work WITHOUT a machine.
The mechanical advantage of this machine is found by dividing length of slope by height.
Wedge
_____ decreases thrust in flight due to friction.
Drag
The amount of work done or energy provided in a period of time.
Power
What creates acceleration (think in terms of forces)?
Name three types of energy we discussed that are used in a DVD player.
Electric, sound, light, kinetic
What's the mechanical advantage of having a single pulley (this answer will not be a number).
It changes the direction of the force.
Lengthen the slope.
The rate of change in velocity over time.
Acceleration
This principle states that a change in pressure at any point in a fluid results in an equal change elsewhere in the fluid.
Pascal's Principle
This type of energy refers to the amount of kinetic energy in the particles of an object.
Thermal Energy
What is the advantage of using a wedge?
A wheel and axle does not change the amount of work that is being done - what do they do?
They magnify the force that can be exerted on something.