Lab: Kinetic Energy — Unit test Answers

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

What is the formula for calculating kinetic energy?

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.

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

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?

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?

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Four landing sites are proposed for a lander. Data about the sites are listed in the table.

A spring that has a spring constant of 1400 N/m is stretched to a length of 2.5 m. If the normal length of the spring is 1.0 m, how much elastic potential energy is stored in the spring?

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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.

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?