Energy
What are 2 examples of energy in action?
A person throwing a ball, a person running
What is the force present when 2 things are rubbed together?
Friction
True/False – In using a lever, the farther the fulcrum is to the load, the less force is needed
False
What are the 2 kinds of machines?
Simple and complex
What do we call the push or pull that does work?
Force
What are 2 examples of stored energy?
A person sleeping, a person standing still
Who was the first scientist to emphasize the importance of observing carefully?
Galileo
What is a block and tackle?
A kind of pulley
How does streamlining help an airplane?
It cuts down friction
What is work?
Pushing or pulling something to move it
What are 2 forms of energy?
Stored energy and energy in action
What are gears?
Sets of wheels working together
What are the 3 parts of a lever?
Force, fulcrum, load
What are examples of each of the 6 simple machines?
Slide, seesaw, flag pole, jar lid, knife, doorknob
Who built a large temple with simple machines a long time ago?
Solomon
What are 4 kinds of energy?
Electricity, heat, light, sound
Where can a person see complex machines?
Everywhere
What is gravity?
An attraction between 2 things that pulls things towards earth’s center
What are the 6 simple machines?
Inclined plane, lever, pulley, screw, wedge, wheel and axle
What is a tool called that makes work easier?
A machine
What is the ability to do work called?
Energy
What is the definition of a complex machine?
Two or more simple machines making up a machine
What 2 things must be overcome for work to take place?
Friction and gravity
What kind of force is gained by using a machine?
Mechanical force
What is useful in measuring how useful any machine is?
Mechanical advantage