Can someone please check these answers for me?
Write T for True or F for False for each statement:
1.Kinetic energy is the energy of motion - T
2.Kinetic energy doesn't depend on an object's direction. - T
3.When an object stops moving, its kinetic energy is zero. - T
4.As the speed of an object increses, but its mass remains constant, its kinetic energy decreases. - F
5.When an object's mass decreases, but its speed remains constant, its kinetic energy increases. - F
Describe how kinetic energy increases and decreases when you're on a swing set:
Ans- When you're in the air, your kinetic energy is at zero or at its minimum; but when you're at the lowest part of the swing, your kinetic energy is high.
Thanks! -MC
All T/F questions are correct.
The kinetic energy of a swing "in the air" is not necessarly zero or a minimum. That is true only at the highest point of the swing's motion.
OK Thanks!
-MC
wow, this question was posted 13 years ago•_•
It appears that the answers you provided for statements 1, 2, and 3 are correct. Kinetic energy is indeed the energy of motion, it does not depend on the object's direction, and when an object stops moving, its kinetic energy is zero.
However, your answers for statements 4 and 5 are incorrect. According to the formula for calculating kinetic energy, which is KE = 1/2 * mass * velocity^2, the kinetic energy of an object increases as its speed increases. Therefore, as the speed of an object increases but the mass remains constant, its kinetic energy also increases. Similarly, when an object's mass decreases but its speed remains constant, its kinetic energy decreases.
Regarding the swing set scenario, when you are in the air between swings, your kinetic energy is at its minimum or zero because you are not moving. However, when you are at the lowest part of the swing, your kinetic energy is at its maximum because you are moving at the highest speed. As you swing back and forth, your kinetic energy continuously fluctuates between these high and low values.