Formulas
What is the formula for potential and kinetic energy?
mgh and 0.5mv^2
Scenario: child jumping on trampoline. What is the most obvious case of energy or work being performed?
Elastic potential energy
Acceptable answers:
Kinetic Energy
Gravitational Potential Energy
A 30 kg bulldog is riding a 2 kg skateboard with a velocity of 5 m/s. What is the kinetic energy of the dog and the skateboard together?
400 J
Which type of collision conserves momentum?
Both!
Mr. Clarence buys a Newton’s cradle. He wants to record how much Kinetic Energy is Transferred from one bead to the next. If he raises the hieght by 3m, the mass of each bead is 4.5kg, and the gravity is 10 m/s^2. What is the Kinetic energy when the bead is at it’s lowest point?
135 Joules
*credit to Aarohi*
What is the formula for Mechanical energy?
Potential Energy + Kinetic Energy
Scenario: Jet fighter plane flying overhead. What is the most obvious display of energy or work done?
Sound energy
Acceptable answers:
Kinetic energy
Potential energy
The acceleration due to gravity on Mars is 3.8 m/s^2. Astronaut Mark Watney is holding a 1.9 kg potato 1.5 meters off the surface of mars. What is the gravitational potential energy of the potato?
10.83 J
Which type of Collision conserves Kinetic Energy?
Elastic Collisions
DAILY DOUBLE
What is the second largest continent?
What is the formula for calculating the spring constant in terms of elastic potential energy and displacement?
Scenario: The sun transferring energy to the earth. What is the most obvious form of energy transferred in this scenario?
Light Energy
Acceptable answers:
Thermal Energy
Chemical Potential Energy
A car that weighs 100kg starts from rest and goes to 30m/s in 2 seconds. Assume the car maintained its acceleration. How much work did the car do after 85 meters?
127,500 Joules
*credit to Paxton*
A moving block has a mass of 5kg moving at 14m/s to the right on a frictionless surface when it collides perfectly inelastically with a pendulum at rest whose mass is 2kg. This is a closed system.
What is the velocity right after the collision?
How high does the ball travel? (g = 10m/s^2)
10 m/s
5 m
When is the Ides of March? (Julius Caesar's death)
March 15th
What is the formula for the conservation of mechanical energy?
Initial Mechanical energy = Final mechanical energy
Initial PE + KE = Final PE + KE
Total mechanical energy remains the same
How would you describe Thermal Energy?
The kinetic energy of particles moving in an object
A pendulum with a mass of 2kg is lifted 8m from its base height and then released. Assume it is a closed system and g = 10 m/s^2, find the velocity at the lowest point.
(radical 160) m/s
or 4 radical 10
*Credit to Nicole*
A 120kg fat person collides (consumes) with a 2kg hot dog that was stationary. The man’s initial speed was 10 m/s. What is the final velocity of both the fat man and the hot dog? Assume perfectly inelastic collision in a closed system.
9.84 m/s
*credits to Maya*
How many feet are in a line of iambic pentameter?
5 feet
What is velocity equal to in terms of Kinetic energy and mass?
v = ((2*KE)/m)^(1/2)
How would you describe Light energy?
The energy from vibrations of electrically charged particles
A box with a mass of 4kg is attached to a spring with a spring constant of 200 N/m. The box is pushed back 0.4m. Assume it is a frictionless surface.
What is the potential energy of the spring before it is released?
What is the velocity of the box after it is released?
16 Joules
radical 8 m/s
*credit to Nick*
DAILY DOUBLE
A 10 kg object travelling at 14 m/s to the right collides with an object of unknown mass travelling at 10 m/s to the left and bounces off. The 10 kg object then travels 2 m/s to the left while the unknown mass travels 22 m/s to the right. What is the unknown mass?
What river whose name is also a common woman's first name is the longest in Ireland, at 224 miles?
Shannon