Which of the following are true?
Kinetic energy can move from one item to another..
Kinetic energy is not transferred from the wind to other objects without needing to touch.
Energy transfers from materials through touch.
Kinetic energy is lost when it transfers between materials.
I apologize for any confusion. Here are the full explanations for each answer option:
1. Energy remains constant during bike riding, and kinetic energy is the energy stored in the bike's frame.
- This statement is incorrect. Energy is not constant during bike riding as energy is being transferred from the rider's muscles to the bike's motion. Kinetic energy is not specifically stored in the bike's frame; instead, it refers to the energy of motion.
2. Energy is lost due to friction, and kinetic energy refers to stored energy.
- This statement is incorrect. While energy may be lost due to friction during bike riding, it does not account for the overall energy transfer involved. Kinetic energy does not specifically refer to stored energy but rather to the energy of motion.
3. Energy is transferred from the rider's muscles to the bike's motion, and kinetic energy is the energy of motion.
- This statement is correct. When riding a bike, the energy transfer occurs from the rider's muscles to the bike's motion. The rider's muscles provide the mechanical energy that propels the bike forward. This transfer of energy allows the bike to move, and this energy is converted into kinetic energy, which refers to the energy of motion.
4. Energy is created from pedaling, and kinetic energy refers to potential energy.
- This statement is incorrect. Energy is not created from pedaling; instead, it is transferred from the rider's muscles to the bike's motion. Kinetic energy does not refer to potential energy but rather to the energy of motion.
The following statements are true:
1. Kinetic energy can move from one item to another.
2. Energy transfers from materials through touch.
The following statement is false:
Kinetic energy is lost when it transfers between materials.
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Quick Check - Energy Transfer and Kinetic Energy
Blended Science 8 (5A/5B) - QUARTER 1 / Energy of Motion
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3.
Which falling object will result in the least kinetic energy when it collides with the ground?
100 grams of water falling at 10 m/s
10 grams of water falling at 1 m/s
100 grams of dirt falling at 15 m/s
10 grams of dirt falling at 2 m/s
To determine which falling object will result in the least kinetic energy when it collides with the ground, we can use the equation for kinetic energy:
Kinetic energy (KE) = 1/2 * mass * velocity^2
Let's calculate the kinetic energy for each falling object:
- For 100 grams of water falling at 10 m/s:
KE = 1/2 * 0.1 kg * (10 m/s)^2 = 5 J
- For 10 grams of water falling at 1 m/s:
KE = 1/2 * 0.01 kg * (1 m/s)^2 = 0.005 J
- For 100 grams of dirt falling at 15 m/s:
KE = 1/2 * 0.1 kg * (15 m/s)^2 = 11.25 J
- For 10 grams of dirt falling at 2 m/s:
KE = 1/2 * 0.01 kg * (2 m/s)^2 = 0.02 J
Therefore, the falling object that will result in the least kinetic energy when it collides with the ground is 10 grams of water falling at 1 m/s, with a kinetic energy of 0.005 J.
.
How does energy transfer between objects?
Energy remains constant and does not transfer between objects.
​Energy is created when objects collide.
Energy is destroyed when objects interact.
Energy is converted from one form to another during interactions.
The correct statement is: Energy is converted from one form to another during interactions.
When objects interact, energy can be transferred from one object to another or converted from one form to another. Energy can change from potential energy to kinetic energy, thermal energy, electrical energy, etc., depending on the nature of the interaction and the properties of the objects involved. The total amount of energy in a closed system remains constant, but its form can change.
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Quick Check - Energy Transfer and Kinetic Energy
Blended Science 8 (5A/5B) - QUARTER 1 / Energy of Motion
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1.
When riding a bike, how would you describe the energy transfer involved, and how does kinetic energy play a role?
Energy remains constant during bike riding, and kinetic energy is the energy stored in the bike's frame.
Energy is lost due to friction, and kinetic energy refers to stored energy.
Energy is transferred from the rider's muscles to the bike's motion, and kinetic energy is the energy of motion.
Energy is created from pedaling, and kinetic energy refers to potential energy.
The correct statement is: Energy is transferred from the rider's muscles to the bike's motion, and kinetic energy is the energy of motion.
When riding a bike, the energy transfer involves the conversion of chemical potential energy stored in the rider's muscles into mechanical energy, which propels the motion of the bike. This transfer of energy allows the bike to move. Kinetic energy refers to the energy of motion, and in the context of bike riding, it refers to the energy possessed by the moving bike.