Practice Kinetic Energy (ke) (5.2.1) - Forces and Motion

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10 questions

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6 sample questions

Question 1.
What is the kinetic energy of a 3 kg object moving at 2 m/s?
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Use the formula KE = 1/2 mv².
Question 2.
If an object has a mass of 4 kg and is at rest, what is its kinetic energy?
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Remember that KE depends on motion.
3Question 3.
What is the formula for kinetic energy?
- KE = mv
- KE = 1/2 mv²
- KE = mgh
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Remember how speed influences energy!
4Question 4.
True or False: An object at rest has kinetic energy.
- True
- False
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Think about what KE depends on.
Question 5.
A sports car of mass 1200 kg travels at a speed of 25 m/s. Determine its kinetic energy. Then, if the car comes to a stop, how much kinetic energy is converted to other forms?
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Calculate the KE first, and remember that stopping means all KE is used up.
Question 6.
An object has a kinetic energy of 250 J and a mass of 10 kg. Find its velocity. If the object is subjected to an external force that causes it to accelerate to 20 m/s, what will be the new kinetic energy?
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Use the relationship between KE, mass, and velocity to find unknowns.

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