Week 7: Work and Energy Capabilities

Work is the product of:

A woman carries a 5 kg box of clothes to donate into the shop. If she walks a horizontal distance of 10 meters from her car to the shop door, how much work has gravity done on the box? First blank is the numerical value. The second blank is for the units. W = [blank_start]0[blank_end] [blank_start]J[blank_end]

How much potential energy does a 1 kg textbook have if it is thrown to a height of 5 meters? (Use a value of 10 for the acceleration due to gravity) U = [blank_start]50[blank_end] J

A book is dropped and slams loudly onto a desktop. Compare the kinetic energy at the bottom to the potential at the top of its motion.

What is the kinetic energy of a 1000 kg car moving at 10 m/s? KE = [blank_start]50,000[blank_end] J

In order to life a 1 kg book to a height of 2 m, how much work must be done? Use a value of 10 for the acceleration due to gravity.

How fast is a 5 kg ball moving the instant before striking the ground after it is dropped from a height of 4 meters? v = [blank_start]8.9[blank_end] m/s

A boy pushes a chair with a force of 25 N. If he exerts the force for 2 meters, how much work has he done on the chair?

A truck driver is trying to push a 1500 kg loaded truck with an applied force of 5000 N. Unfortunately, his attempt was unsuccessful the truck stays stationary no matter how hard the driver pushes. How much work is done by the driver?

Two heavy objects collide. Which of the following could be where their initial kinetic energies could be transferred?