Term

Definition
The time interval between two successive occurrences of a recurrent event or phases of an event 


Term

Definition
The number of times a specified periodic phenomenon occurs within a specified interval 


Term

Definition
The maximum absolute value of a periodically varying quantity 


Term

Definition
distance at which a wave repeats itself 


Term

Definition
The product obtained by multiplying the average value of a force by the time during which it acts. The impulse equals the change in momentum produced by the force in this time interval 


Term

Definition
transfer of energy from one physical system to another 


Term

Definition
a measure of how difficult it is to stop a moving object 


Term
define and give examples of transverse waves 

Definition
s wavesthose waves whose direction is perpendicular to the disturbance producing it
ex. light (3x10^8m/s) 


Term
define and give examples of longitudinal waves 

Definition
p wavesthose whose direction is parallel to the disturbance producing it
ex. sound(344m/s) 


Term
Discuss resonance. give 3 examples. 

Definition
Resonance is defined as when a system is driven or pushed at its natural frequency the amplitude of oscillation grows very large, very fast.
Ex. child on swing, troops over bridge, voice breaking a glass 


Term
Discuss how standing waves are produced 

Definition


Term
why do troops break step when crossing a bridge? 

Definition
Bc if their foot falls match the natural frequency of the bridge it will collapse 


Term
Why will sound not travel in a vacuum? Will light? 

Definition
This is because sound is the vibration of molecules, and there is nothing in a vacuum so there are no molecules to vibrate. Light can because it only needs eletric and magnetic fields to exist, and a vacuum has such fields. 


Term
A water wave has a wavelength of 12 cm and a speed of 50 cm/s. What is the wave's frequency? 

Definition


Term
Discuss Fnet=ma vs Wnet=ΔKE 

Definition
The Wnet equation can be derived from the Fnet equation. The Wnet equation is the 1st enery theorem, and states that network is equal to change in energy due to an object's motion. 


Term
Define nodes and antinodes. 

Definition
A point or region of virtually zero amplitude in a periodic system
a point at which the amplitude of one of the two kinds of displacement in a standing wave has maximum value 


Term
what is the range of frequency of hearing for humans? 

Definition


Term
Draw a wave and label the graph: T, f, A, and λ 

Definition


Term

Definition
energy due to an objects motion
energy due to an objects position 


Term
Can an object have KE and PE at the same time? 

Definition
YESmid swing there is half and half 


Term
Can KE cancel? Can momentum cancel? 

Definition
No, there can never be a negative KE
Yes, it can cancel with momentum in the opposite direction 


Term
Why do golfers follow through and hit hard? 

Definition
To increase momentum, you can make change in momentum as large as possible if you increase force and increase time (i.e., swing through for a longer time and hit harder for greater force) 


Term
Compare and contrast energy and momentum 

Definition
Conservation of momentum is one of two casesincrease or decrease
Conservation of energyenergy cannot be created or destroyed, only transformed. (Joule, 1850)
however, momentum is the application of kinetic energythe equation can be used to derive the Wnet equation. 


Term
A 1000kg rocket has 40 million joules of KE. How fast is the rocket travelling? 

Definition


Term
Does a tree that falls in the woods make a sounds when it strikes the ground? 

Definition
Yes, because sounds is mechanical energy and when the tree falls it creates waves of vibration that are sound molecules. 


Term
why did the tacoma bridge of wa collapse in 1940? 

Definition
because of resonance, the strong winds blew that the same frequency of the bridge 


Term
Why does a punch hurt more with a bare hand than with a boxing glove on? 

Definition
Because the glove works to decrease momentum of the hand, it slows down the time it takes for the hand to reach the object, so the force is less 


Term
A book of mass 1kg and with speed 200 cm/s has KE=? 

Definition


Term

Definition
displacement (or height), mass, and acceleration due to gravity 


Term

Definition
mass and velocity
(or moment of intertia and angular accelerationfor rotational KE) 


Term

Definition
No and Yes, if it has a negative height (the refrence point is above the starting position and the object is travelling down) 


Term
how does one increase the momentum of a baseball? 

Definition
Increase force (throw harder) and increase time (follow through) 


Term
What is the speed of sound in air? 

Definition


Term
what happens to an object when Wnet is performed on the object? 

Definition
There is a change in the kinetic energy of that object.
The forces on the object that are perpendicular do not change the KE, but those in the same or opposite direction of the motion do affect KE 


Term
Discuss the energy tranformations involved with a skier skiing down a steep hill 

Definition
First, the skier is stopped at the top of the hill and has GPE=mgh. Once the skier begins down the hill the GPE is somewhat transformed into KE=1/2mv^2. At the very bottom of the hill before it flattens out, the skier has GPE=0 and all KE. Once the skier reaches the flat part, he comes to rest and once again GPE=mgh, and KE=0. 


Term
Write down the three energy theorems. 

Definition
1. Wnet=ΔKE
2. MEi=MEf (no friction)
3. MElost=MEfMEi (includes friction) [fΔx=MEfMEi] 


Term
Why do cars have "giveable" bumpers? 

Definition
To decrease momentum, if the bumper gives way, then it works to increase the time for a collision which decreases the force 


Term

Definition
It can speed things up or slow things down 


Term
Define I and rotational variables 

Definition
Moment of inertia, resistance to an objects change in angular velocity
conservation of angular momentum, if I gets smaller, ω (angular velocity) gets larger 

