Work and Power
What is work?
W= F d
How much Kinetic energy does an object posses if it isn't moving?
None.
How much potential energy does a tennis ball on the ground posses?
None.
Which of the following causes an object's energy to change?
a. when it rests
b. when you carry it
c. when work is being done to it
You lift a load of clothes in a basket and walk up the stairs. How much work would you do if you lift the same load of clothes up 2 flights of stairs?
a. a 1/4 as much
b. double
c. 4 times as much
double
How much work is completed if you apply a force of 1100 N and move an objects 1 m?
1100 J
How much kinetic energy does a 17kg dog posses if runs 12m/s?
1224 J
How much PE does a 1kg ball have if it is resting 5m off of the ground?
49 J
If a bow has a spring constant of 3N/m, how far back is it drawn in order to obtain 5J of PE?
1.82 m
Which is an example of a closed system?
boiling pot of water with the lid on OR a person sweating after working out?
Boiling pot of water with lid on
How much work is produced if you lift a 10kg box 10m in 2 seconds starting from rest?
500 J
A ball traveling 10m/s has 45J of KE, what is it's mass?
.9 kg
If a 2kg book posses 50J of PE, how high is it off of the ground?
2.55 m
2 jobs are being done. One quickly and one slowly. They are using the same amount of work but different amounts of____________
power
a car drives over a rough patch of pavement which makes it slow down. which statement is true below:
The rough patch preformed positive work on the car OR the rough patch preformed negative work on the car.
negative work
How much power do you produce if a 100N force causes a ball to roll 12m in 12 ?
A 3000kg truck has 6000 J of KE, what is it's velocity?
2m/s.
If an objects posses 50000J of PE and is 1200m off of the ground, what is the mass of the object in grams?
4250 g
How much work is being done pushing with a 50 N force on an object moving 10 m?
500J
What is the best high school in Georgia?
PHS!
If a pitcher throws a baseball to a catcher who is doing negative work on the ball?
The catcher
A .2kg book travels 12m from rest in 18 seconds, how much kinetic energy does it posses?
.04 J
If an object posses 1000J of PE and has a mass of 25kg, how far is it off the ground?
4m
List EVERYTHING happening to an apple as it falls from a tree
its PE decreases, its KE increases, its TME remains the same
Who is the best teacher ever
Mrs. Jones