Types of Forces
A force is...
a push or pull
What are the 4 types of friction?
Fluid, Static, Sliding, Rolling
What is the measurement of gravity?
Weight
What direction does buoyancy act in?
Upward
What is velocity?
The two categories of forces are...
Contact and non-contact
Fluid friction can occur in...
What is the difference between weight and mass?
Weight is the measurement of the strength of gravity pulling on an object. Mass is the amount of matter in an object.
What is the main factor if an object can float?
Density
What is acceleration?
How quickly something changes speed and/or direction
Force that opposes motion and causes objects to slow
Friction
What determines how much friction an object experiences?
The roughness of the surface it is on
What makes objects fall at different speeds?
Air resistance (friction)
If an objects density is less than the liquid it is in, will it float or sink?
Float
What is Newton's 1st law of motion?
An object as rest will stay at rest and an object in motion will continue its motion unless acted on by unbalanced forces.
Force that attracts objects and pulls them towards the center of the Earth
Gravity
How can you reduce friction?
Add a lubricant
What speed does gravity pull objects at?
9.8 m/s
What is the equation for density?
mass/volume
What is Newton's 2nd law of motion?
An object accelerates when a force acts on an object with mass.
Which does not belong?
Tension, spring, applied, electric, buoyancy
Electric
Which take more force AND WHY:
Start moving an object
Keep an object moving
Start, static friction is holding the object in place
You travel to Jupiter. Would your weight be more, less or the same? Would your mass be more, less or the same?
Mass=the same
Which is less dense, hot or cold air? WHY?
Hot because the molecules are faster and more spread out
What is Newton's 3rd law of motion?
For every action there is an equal and opposite reaction.