💨💨science Flashcards
A car’s steering wheel is an example of a machine called ….. …. ……
wheel and axel
what is a unit of work?
joule
An ideal machine has an efficient of what percent?
100%
You divide the radius of a wheel by the radius of an axle. what are you calculating?
the ideal mechanical advantage
How can a machine make work easier?
Changing the direct of force needed to accomplish a task
You do 1,200 J of work using a screwdriver? The screwdriver does 900 J or work on a screw. What Is
the efficiency of the screwdriver?
75%
When you bend your arm at the elbow, the fulcrum is what part of your arm?
elbow
Compound machines are what?
combinations of simple machines
The more efficient a machine is, the closer the actual mechanical advantage is to the what?
ideal mechanical advantages
In order to do work on an object, the object must do what?
• move same distance
Muscles are attached to bones by what?
Tendons
The number of times a force exerted on a machine is multiplied by the machine is called what?
mechanical advantage
In a screwdriver, the handle is the wheel and what is the shaft?
Axle
What does a machine do with the amount of work you do?
Doesn’t decrease
When you bite into a sandwich, what do your front teeth act as?
wedge
