KEY TERMS
What type of energy is due to an object’s motion?
Kinetic Energy
What is the formula for kinetic energy?
KE= ½mv^2
What unit of measurement is used with kinetic energy?
Joule
A 70.0 kg stuntman is attached to a bungee cord with an unstretched length of 15.0 m. He jumps off a bridge spanning a river from a height of 50.0 m. What is the given mass of the stuntman?
70 kg
What are the two types of mechanical energy?
Potential and kinetic
What type of energy is associated with the position, shape, or condition of the object?
Potential Energy
What is the formula for gravitational potential energy?
PEg=mgh
What unit of measurement is used for power?
Watt
What equation should be used to solve the following... How much work is done on a vacuum cleaner pulled 3.0 m by a force of 50.0 N at an angle of 30.0° above the horizontal?
W = Fd cos(theta)
What expression represents the conservation of mechanical energy?
MEi=MEf
What parameter is a measure of a spring’s resistance to being compressed or stretched?
Spring Constant
What is the formula for elastic potential energy?
PEelastic=½kx^2
What unit of measurement is used with elastic potential energy?
Joule
What equation should be used to solve the following... On a frozen pond, a person kicks a 10.0 kg sled, giving it an initial speed of 2.2 m/s. How far does the sled move if the coefficient of kinetic friction between the sled and the ice is 0.10?
Wnet = Fnetdcos(theta)
What is it called when total mechanical energy remains the same in the absence of friction?
Conservation of Mechanical Energy
What type of energy becomes available for use when a deformed elastic object returns to its original configuration?
Elastic Potential Energy
What equation is used to find work?
W=Fd
What equation is the equivalent of a joule?
Kgm^2/s^2
A 7.00 kg bowling ball moves at 3.00 m/s. Find the kinetic energy of the ball.
KE=31.5 J
When an object falls, what type of energy is potential energy converted to?
Kinetic Energy
What is it called when the net work done by all the forces acting on an object is equal to the change in the object’s kinetic energy?
Work-Kinetic Energy Theorem
What equation is used to find power?
Power=Force x velocity
What equation is the equivalent of a watt?
J/s
Starting from rest, a child zooms down a frictionless slide from an initial height of 3.00 m. What is her speed at the bottom of the slide? Assume she has a mass of 25.0 kg.
vf = 7.67 m/s
What factor causes mechanical energy to become "lost"?
Friction