Multiple Choice
Kinetic energy is the energy of ______ .
A) Motion
B) Gravity
C) Acceleration
A) Motion
W = F x d
Determine the gravitational potential energy of a 25.2 kg rock sitting on a cliff with a height of 333.7 meters.
82410.5 J
How much work is done when a force of 60 N pushes an object at a distance of 67 meters?
4020 J
A ball is thrown straight up into the air. At the lowest point of its trajectory, what is the total potential energy of the ball?
0 J
If an object is on top of a hill or in a position raised above the ground, it must have __________.
A) kinetic energy
B) gravitational potential energy
C) elastic potential energy
B) gravitational potential energy
How would I solve for mass when using the kinetic energy formula?
If a 0.5 kg book is lifted to a shelf 2 meters high, how much gravitational potential energy does it have?
9.8 J
DAILY DOUBLE:
If a person lifts a box weighing 720 N to a height of 4.5 meters, how much work is done?
3240 J
A rock with a mass of 5 kg is dropped from a height of 10 meters on the surface of the Moon. If the gravitational potential energy (GPE) of the rock at that height is 50 Joules, what is the acceleration due to gravity (g) on the Moon?
1 m/s2
Work _____ energy.
A)Reflects
B)Transfers
C)Stops
B)Transfers
If something is not moving, what would the mechanical energy formula look like?
ME = mgh + 0J
DAILY DOUBLE:
Nacho Libre is moving at the speed of 989 m/s, his kinetic energy is 90,000,007 J. What is his mass?
184.02 kg
A roller coaster car has a total mechanical energy of 789256 J at the top of a hill. If its kinetic energy is 356407 J, what is its potential energy at that point?
432849 J
If the kinetic energy of an object is 789127 J and the potential energy of an object is 387657 J then find the Mechanical energy.
1176784 J
DAILY DOUBLE: An object with a mass of 2 kg is placed on a shelf 3 meters above the ground. What is the potential energy of the object?
58.8 J
What is the formula for Mechanical Energy?
mechanical energy = kinetic energy + potential energy
How much kinetic energy does a duck with a mass of 22 kg have if it is moving at a speed of 50 m/s?
27500 J
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DAILY DOUBLE:
An owl has a mass of 7.77 kg. It dives to catch a mouse, losing 900 J of its GPE. What was the starting height of the owl, in meters?
h =11.8 m
According to the law of conservation of energy, the total amount of energy in the universe ____.
A) remains constant
B) changes constantly
C) increases
A) remains constant
DAILY DOUBLE:
What is the measurement of Joules?
Joule(J) = mass * velocity/speed * displacement
23.7 J
Take off 2000 points off a team's score.
Take off 2000 points off a team's score.
A rocket travels 5000 meters east, pauses briefly, then continues for another 3000 meters east, all within 150 seconds. What is the rocket's average speed during this journey? If the rocket has a mass of 6000 kg, what is its kinetic energy at the end of the journey?
KE = 8572222.2 J