Kinetic Energy — Unit test Answers

Four different balls are moving at the same velocity. Which will have the greatest kinetic energy as it rolls?

Suppose an object’s initial velocity is 10 m/s and its final velocity is 4 m/s. Mass is constant.What can best be concluded about the object based on the work-energy theorem?

Why is it important to know the direction of the force applied to a moving object and the direction in which the object is moving when determining the work done on the object?

A 60.0 kg object is moving east at 8.00 m/s, and then slows down to 4.00 m/s. How much work was done?

What is the formula for calculating kinetic energy?

If 3,600 J of work is done in 3.0 s, what is the power?

Suchita is going to make an energy transfer diagram to represent the energy transformations associated with the flame of a gas stove. The diagram will show that the chemical energy of the fuel transforms into 50 J of chemical energy, 400 J of heat, and 200 J of light.

To do work, this truck uses energy stored in chemical fuel and an electrical battery.

Luke pulls a sled using a force of 65 N for a distance of 25 m across level ground. The rope Luke pulls forms an angle of 25° with the ground.

A moving company collects data about couches they move and displays the data in a table. The force along the ramp, the angle of the ramp, and the height the couch is raised from the ground to the platform is shown below. Which statements correctly compare the work done to move the couches? Select three options.The same amount of work is done for couches 1 and 3.The same amount of work is done for couches 2 and 3.The work for couch 1 is greater than the work for couch 2.The work for couch 2 is less than the work for couch 3.The work for couch 3 is greater than the work for couch 1.The work for couch 2 is greater than the work for couch 1.

If a 4.5 kg object is dropped from a height of 6.0 m, what will be its velocity when it is halfway toward the ground? (Use g = 9.80 m/s2, and ignore air resistance.)

Earth and all of the air in the atmosphere around it make up an incredibly complex system. Energy is constantly changing forms in many different ways.

Which energy transformations occur in this case? Check all that apply.

The energy transfer diagram represents the energy of a person diving into a pool.

The table shows the mechanical energy and velocity of a rock that was thrown four times. The rock has a mass of 2.4 kg.During which trial was the rock the highest above the ground?