Term
Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel is able to push for 5 min longer. Compare the work against the wall they each do. 

Definition
Neither of them do any work. 


Term
What does the graphs that illustrates Hooke's Law (the spring force) look like


Definition


Term
A simple pendulum, consisting of a mass m and a string, swings upward, making an angle θ with the vertical. The work done by the tension force is
[image] 

Definition


Term
[image]
What is the mass of the pendulum 'bob' in the figure? 

Definition
1 kg
W = mgd
9.8/(9.8*1m) = 1kg 


Term
What is the total mechanical energy, ME, of the pendulum?
[image]


Definition
9.8 J
ME = PE+KE
ME = 9.8 + 0 


Term
What is the maximum kinetic energy of the pendulum?
[image]


Definition


Term
What is the potential energy, PE, at Point B and D?[image] 

Definition
4.9J
W=mad
W = 1kg * 9.8 * .5m



Term
At Point B and D what is the relationship between the kinetic energy, KE and[image] the potential energy, PE? 

Definition


Term
What is the speed of the pendulum at Point B and D?[image]


Definition
3.1 m/s
KE = (mv^2)/2
mad = (mv^2)/2
2mad=mv^2
2ad=v^2
sqrt(2ad)=v



Term
What is the speed of the pendulum at Point C?
[image]


Definition
4.4 m/s
((mv^2)/2) = mad
note= distance traveled is 1m



Term
A simple pendulum, consisting of a mass m, is attached to the end of a 1.5 m length of string. If the mass is held out horizontally, and then released from rest, its speed at the bottom i[image]s 

Definition
5.4 m/s
KE = mv^2/2
sqrt(2ad) = v



Term
A 4kg mass moving with speed 2 m/s, and a 2kg mass moving with a speed of 4 m/s, are gliding over a horizontal frictionless surface. Both objects encounter the same horizontal force, which directly opposes their motion, and are brought to rest by it. Which statement best describes their respective stopping distances? 

Definition
The 2kg mass travels twice as far as the 4kg mass before stopping.



Term
A 4kg mass moving with speed 2 m/s and, an otherwise identical, 2kg mass moving with a speed of 4 m/s, are gliding over a horizontal surface with friction and are brought to rest by it. Which statement best describes their respective stopping distances? 

Definition
he 2kg mass travels greater than twice as far.
retarding force



Term
A force that Object A exerts on Object B is observed over a 10second interval, as shown on the graph. How much work did Object A do during that 10 s?
[image]


Definition


Term
A force that Object A exerts on Object B is observed over a 10second interval, as shown on the graph. What is the average power output of A into B?
[image]


Definition


Term
The resultant force you exert on a shopping cart, for a 10 s period, is plotted on the graph shown. How much work did you do during this 10 s interval? [image] 

Definition


Term
The resultant force you exert on a shopping cart, for a 10 s period, is plotted on the graph, shown. What is the average power?
[image]


Definition
The average power is zero. 


Term
How much work was required to bring the 1000kg roller coaster from Point P to rest at Point Q at the top of the 50 m peak?
[image]


Definition
490,000 J
W = mad
1000*9.8*50



Term
If the roller coaster leaves Point Q from rest, how fast is it traveling at Point R?
[image]


Definition
31.3 m/s
KE = mv^2/2
mad = mv^2/2
sqrt(2ad) = v



Term
If the roller coaster leaves Point Q from rest, what is its speed at Point S (at the top of the 25m peak) compared to its speed at Point R?
[image]


Definition


Term
What was the total work done on you by all the forces in the universe between the time just before you awoke this morning and right now?


Definition


Term
Two cars, starting from rest at the same place, travel by different routes to the same destination. One of the cars passes the other as they drive through it. Which of the following statements will be true? 

Definition
The work done by gravity is the same on both. 


Term
The work done by friction, f, is equal to


Definition
equals fd, where d is the total distance moved.
The angle is always 180 degrees.



Term
A 102 kg man climbs a 5.0 meter high stair case at constant speed. How much work does he do?


Definition


Term
A ball is released, from rest, at the left side of the looptheloop, at the height shown (h = 2R). If the radius of the loop is R and there is no friction, what vertical height does the ball rise to on the other side?
[image]


Definition

