Monson Test 2
Terms in this set (30)
What is a force?
Any influence that tends to accelerate an object
What is a force considered to be?
A push or pull
How is a force measured?
Is a force a vector or scaler?
What is a scaler?
A quantity that can be completely described by one value: MAGNITUDE
What is a vector?
A quantity that includes MAGNITUDE and DIRECTION (requires more than a number...ex. 1 m/s)
How is a vector represented?
- by arrows
- length of arrow represents the magnitude
- tip of arrow points to the direction
What is a net force?
When more than once force acts on an object, the combination of all forces acting
Is a net force a vector or scaler?
What does a net force change?
It changes an object's state of motion
What is mechanical equilibrium?
When the net forces on it are equal to zero (all forces are balanced)
How is mechanical equilibrium measured?
E (weird e) F = 0
- e stands for vector sum
- f stands for all force
In the end all forces must equal...
What are the different types of forces?
2) support force
What is weight?
The force that pulls on you
What is another name for weight?
What varies something's weight?
Where someone is (earth, moon, etc.)
What never changes no matter where you are?
What is mass?
Describes how much matter something is made of
What is support force?
The force that a surface PUSHES on you to support you
What is another name for support force?
Normal force, contact force
What is tension?
The force that a string has on an object
What can tension only do?
How is tension measured?
What is friction?
The force that OPPOSES the direction of the intended motion of an object
What happens when friction occurs?
Tow different surfaces are 'scraping' against each other
How is friction measured?
What is Newton's first law of motion?
Every object continues in a state of rest (static equilibrium) or of uniform speed in a straight line (dynamic equilibrium) unless acted upon by a net force
Can Ian object in equilibrium have only one force acting on it? Why or why not?
No - it must have at least tow forces or the net force would not equal zero
What is also considered to be in equilibrium when moving?
An object moving at constant speed in a straight line path whether at rest or steadily rolling a straight line path