Midterm Flashcards
What is the rate at which you travel a certain distance
Speed
What is a quantity that has both magnitude and speed
Vector
What is the change in displacement divided by the change in time
Velocity
What is the difference between speed and velocity
Speed only has magnitude velocity has magnitude and direction
What is acceleration
The rate of change in velocity
What happens after two seconds of you drop your pumpkin off the roof?
Accelerates -20m/s
If you throw something straight up at 20 m/s after 1 second it is traveling at_______?
10 m/s
20-10=10
If you throw an object up at 1m/s and Sally throws one up at 3 m/s how do the distances compare
Maximum hieght is 9x higher
What is the force of gravity always equal to
Mg
When you fire a bullet sideways and drop one which hits the ground first
Same time
What happens if you drop a bottle outside you car window with no air resostance
Lands next to car
With oar resostance where will the bottle land
Behind the car
An objects resistance to the change in motion is called _____
Inertia
What is the measure of an objects inertia
Mass
What happens when there is no net force on an object
Equilibrium
What happens if you increase the angle at which you are pulling an object
Fpx decrease and fn decreases
If you increase the angle on a frictionless ramp the normal force will_______
Go down
What does friction depend on
Force and type of surface
Friction doesn’t depend d on_______
Surface area or velocity
Is static friction = to less than or greater than your push
Greater or equal to
Is kinetic friction less than or greater then your push
Less than
What happens to friction if you pull with a greater angle
It goes down
What is momentum
Inertia in motion
What does impulse equal
Force x time
What
Is an in elastic collision
Stick together
What is an elastic collision
Start apart go apart
Explosion
Start together go apart
What is work equal to
Force times distance
Power = _______
W/t
In ramp qu agitations what does fgx equal and what does fgy equal
Fgx= sin Fgy= cos
In pulling problems what does fpx= and fpy=
Fpx= cos
Fpy=sin
What equation do you use to find fgx on a ramp problem?
Fgx= fg sin(angle)
