1. You are told 3 things...1. That there are two objects with equal masses. 2. Both objects are in motion. 3. One object has a greater kinetic energy than the other. How is this possible?
a. One object has a greater volume than the other object.
b. One object has a greater density then the other object.
c. One object has a greater speed than the other object.
d. One object is blue and one object is red.
2. A large truck and a small car are moving at the same speed, traveling up and down hills, and over bumpy roads. Which one has more kinetic energy?
a. The truck has more kinetic energy because it has a greater mass.
b. The truck has less kinetic energy because it has greater mass.
c. The car and truck have the same kinetic energy.
d. The car has more kinetic energy because it moves fast down hills.
3. Use the image to answer the question.
An illustration shows a person running after a rabbit. The person weighs 60 kilograms, and the rabbit weighs 4 kilograms. The speed of both is 5 meters per second.
A wildlife keeper is trying to catch an escaping rabbit. Who has the greater kinetic energy, the rabbit or the wildlife keeper?
a. The wildlife keeper because they speed up and catch the rabbit.
b. Neither one because they are moving at the same speed.
c. The wildlife keeper because they have a greater mass.
d. The rabbit because it has less mass.
4. A skydiver jumps out of a plane and begins to accelerate. His speed increases to 20 m/s, then 30 m/s. His acceleration slows until he reaches a constant speed of 50 m/s. Which statement accurately describes his kinetic energy while falling?
a. His kinetic energy was positive at first, but it decreased to zero when he stopped accelerating.
b. His kinetic energy increased quickly at first, then it increased at a constant rate.
c. His kinetic energy increased while his speed increases, then it became constant.
d. His kinetic energy would remain the same for the whole fall as long as he lost no mass.
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Here are the correct answers for each question:
c. One object has a greater speed than the other object.
a. The truck has more kinetic energy because it has a greater mass.
c. The wildlife keeper because they have a greater mass.
c. His kinetic energy increased while his speed increases, then it became constant.
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