Chap. 1,2, & 3 Flashcards
What is one unit of measuring force?
Pound
What is force?
Any influence capable of producing a change in the motion of a body
How many ways can force change the motion of a body?
- It can cause a body to move
2. It can retard or stop a body which is moving
What is resistance?
Any force which can stop or retard the movement of a body.
What are examples of resistance?
Friction and inertia
What is always present between the contacting surfaces of two objects when they are moving across one another?
Friction
The reluctance of a body to a change in motion is __________.
Inertia
How is inertia directly related to the quantity of matter in a body?
The more mass or matter, the heavier an object is the harder it is to move.
Energy is ________.
A force which can cause a body to move
How can inertia be energy?
A moving body exhibits a reluctance to be stopped, and can strike another body and cause its motion(to move).
What are some forms of energy?
Mechanical, heat, electrical, light, chemical, and sound.
Law of conservation of energy
Energy can neither be created or destroyed, but it may change from one form to another
Electrical energy can change into ________.
Light, heat, mechanical, or sound energy.
What is an important consideration when dealing with energy?
Identifying the state or condition it is in when found.
Kinetic energy is ________ energy. It causes ________ by contacting an object’s surface.
Moving, movement
What is potential energy?
Stored energy
Why does potential energy has the ability to become kinetic energy?
It’s physical make up or it’s position above reference point
Joule is the unit for work in the _____.
Metric system
Can kinetic energy be converted into potential energy?
Yes
The movement of an object through a distance and the ability to get things done is _______.
Work
______ is the unit for measuring work in hydraulics.
Foot-pound(ft. lb)
The expression which describes work is:
Work = distance moved x force exerted
Ft. lbs) (ft.). (lbs
What is the speed or rate at which work is done?
Work
The description of power is:
Distance moved Force exerted
X
(ft.). (lbs)
Power= ______________________________
Time(seconds)
