Units and Equations
Unit of Work
What is Joule?
What is the ability to do work?
Energy
A 100 N force is applied to move a 15kg object horizontal distance of 5 meters at constant speed. Solve for work.
What is 500 Joules?
What is the formula?
What is PE=mgh?
What is the formula?
What is KE=1/2*m*v2?
Unit of power
What is Watts?
What is energy can not be created nor destroyed?
Law of Conservation of Energy
A horizontal force of 200 N is applied to move a 55 kg crate across a level surface 4 meters. What is the work done by the applied force on the crate?
What is 800 Joules?
True or false
Potential energy is energy of motion.
What is false?
True or False
Kinetic energy is energy of motion.
What is true?
Equation for work
What is 1 Joule(J)=1 Newton(N)*1 meter(m)?
What is the energy transferred to or from an object via the application of force along a displacement?
Work
A boy pushed on a parked car with a force of 400 N for 25 seconds. The car does not move. How much work does the boy do?
What is no work is done? (no movement=no work is done)
True or False
When a force is applied to a spring, its coils either stretch or compress. The amount of stretch is proportional to the amount of applied force.
What is true?
True or False
Kinetic energy is a vector quantity.
Equation of Power
What is Power=Force*Velocity
What is the energy possessed by an object as a result of its motion?
Kinetic Energy
A 4.0-kg object has 72 J of kinetic energy. Determine its speed.
What is 6.0m/s?
What is Hooke’s Law?
What is Fspring=k*Δx?
Find the kinetic energy of a 0.50 kg ball being thrown at 5.0 m/s.
What is 6.25 J?
Equation of Elastic Potential Energy
What is 1/2*k*Δx²?
What is the energy that is possessed by an object due to its motion or due to its position, or both?
Mechanical Energy
An owl has a mass of 4.00kg. It dives to catch a mouse loosing a total of 800.0 J of GPE. How high was the bird to begin with?
*Assume gravity is 10
What is 20 meters?
A wheelbarrow is filled with bricks and lifted to the top of a wall. If the mass of the loaded wheelbarrow is 3,000 grams and the height of the wall is 45 centimeters, what is the difference in GPE from the top of the wall to the bottom of the wall?
What is 13.5 Joules?
3*10*0.45 m (convert from centimeters to meters)
If the velocity is doubled, what happens to the kinetic energy?
What is kinetic energy is quadrupled?