Work, Energy, Power
Pendulum and rollercoaster
Calculating Work and Power
Calculating Energy
St. Paddys Trivia
100
Define energy and record the correct units
Energy is the ability to do work, and the units are Joules
100
Identify where the pendulum has the maximum potential energy
A B C
Positions A and C
100
A force of 15 N is applied to an object over an 8 meter distance. How much work is done?
W = F x d
W = 15 x 8 = 120 J
100
A 7 kg mass is lifted 2.5 meters from the ground. Calculate the change in potential energy. Use formula PE = m x g x h
171.5 J
100
How long is the shortest St. Paddy's Day Parade?
a. 26 ft
b. 98 yds
c. 98 ft
d. 26 yds
d
200
Define work and it's units
Work is force times distance and the units are joules
200
Identify on the pendulum where the kinetic energy is at a maximum
A B C
Position B
200
A student did 120 J of work running up a flight of stairs in 7 seconds. Calculate the student's power
17.14 Watts
200
A 8.5 kg mass is lifted 3 meters from the ground. Calculate the change in potential energy. Use formula PE = m x g x h
250 J
200
What city dyes its river green every St. Patrick's Day?
a. Manchester
b. Budapest
c. Amsterdam
d. Chicago
What is d
300
Define power and its units
Power is work over time and its units are Watts
300
Identify where the pendulum's kinetic energy is a minimum
A B C
Positions A and C
300
You run up a flight of stairs, then you walk up the same flight of stairs. In which case did you use the most energy?
Same
300
A 50 kg runner is moving at a speed of 2.5 m/s. Calculate the runners kinetic energy
156.25 J
300
What was Saint Patrick's real name?
a. Seamus
b. Darragh
c. Maewyn
d. Aengus
What is c
400
Define Potential Energy and give its formula
Potential energy is energy due to an object's position and the formula is PE = mgh
400
Where on the rollercoaster is the potential energy the smallest?
Bottom of the hill
400
You run up a flight of stairs, then you walk up the same flight of stairs. In which case did you use the most power?
Running
400
What is the kinetic energy of an 80 kg football player running at 8 m/s?
2,560 J
400
Where was St. Patrick born?
a. Ireland
b. Germany
c. Britain
d. Norway
What is c britain
500
Define Kinetic Energy and give its formula
Kinetic energy is energy due to an object's motion and its formula is KE = (1/2)mv^2
500
Where is the potential energy at a maximum on the rollercoaster?
At the top of the first hill
500
A monkey pushes a wheelbarrow with a constant force of 145 N. The monkey moves the wheelbarrow 60 meters in 25 seconds. Calculate the work and the power.
8,700 J
348 W
500
According to Irish Lore, what did Saint Patrick drive out of Ireland?
a. snakes
b. demons
c. rats
d. witches
What is a. snakes