Physics
what is pressure measured in
pascals
What is net force?
combination of all forces acting on an object
What forces are at work: Book siting on a desk
Normal force, gravity, maybe friction
Formula for pressure
p=force/area
How did Archimedes' principle come about?
Putting the crown in water!
Difference between mass and weight?
weight has to do with gravity. mass does not
What forces are at work: Writing with a pencil
Applied force, gravity, normal force, friction
What is Newton's first law?
Inertia: objects in motion to stay in motion and objects at rest to stay at rest, unless a force causes its velocity to change
What two things affect the density of an object?
mass and volume
Acceleration in a circular motion is know as
centripetal acceleration
What forces are at work: Free falling object from the sky
Air resistance, gravity
Speed
Draw a force diagram: You slid a book on the table to the person next to you.
*see photo*
Force of gravity on earth
9.8 m/s^2
What forces are at work: Pushing a box across the floor
Applied force, normal force, gravity, friction
Find velocity: Car traveled 50 meters north in 10 seconds.
5 m/s North
Physics students drop a leaf and a shoe from the same height and record the time it took to reach the floor. Why did they reach the floor at different times if gravity is the same on each?
Air resistance
What is motion?
change in position over time
What forces are at work: Throwing a ball into the air
applied force, air resistance, gravity
Force we get from Newton's third law?
Normal force