motion
definition of distance
how far does something travel
definition of trajectory
the flight path of a projectile
what is tension force
pulling force caused by a non-rigid object
what does the universal gravitation law say?
there's a gravitational force of attraction between any 2 masses and the magnitude of the force depends on the mass of the objects and the distance between the centers of those masses
what is diffraction
when waves bend around an object or opening
what is the difference between speed and velocity
speed (scalar): how fast something moves
velocity (vector): how fast something moves and which direction it travels
If I'm firing a cannonball, at what angle will the canon need to be if I want max distance?
45 degrees
what is applied force
push/pull from anything
T=fd
what is this formula for?
torque
how much work is it to lift a 20 kg sack of potatoes vertically 6.5 m?
w=mad
20(9.8)(6.5)=1274 J
in a position-time graph, what does a negative slope mean?
negative velocity
definition of projectile
any object hurled through the air in which gravity is the only force affecting its motion
what is the 2nd law of motion?
an object will accelerate or change direction when a force is applied
what happens to the force if you increase the distance between two masses by 5x?
F/25
waves that don't need matter to move are called _______.
electromagnetic waves
what is one formula for acceleration
Vf-Vi/time
in the vertical direction, there's acceleration due to ____?
gravity
what is the 3rd law of motion?
for every action, there is an equal but opposite reaction
force and mass are ___ proportional
directly
what is the power when a voltage of 120 V drives a 2 A current through a device?
P=IV
2(120)=240 W
gravity
A ball is thrown horizontally from the roof of a building 50 m tall and lands 45 m from the base. What was the ball's initial speed?
14.1 m/s
An object of mass 300 kg is observed to accelerate at the rate of 4 m/s squared. Calculate the force required to produce this acceleration.
f=ma
300(4)=1200 N
what has to be the same on both sides of the fulcrum for a see-saw to balance?
torques on both sides must be the same
what is constructive interference?
2 (or more) waves overlapping which causes the amplitude to increase