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4th Grade Science Flashcards: Predict Energy Changes From Speed

Study Predict Energy Changes From Speed in 4th Grade Science with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

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What this deck covers

This deck focuses on Predict Energy Changes From Speed, giving you a quick way to review the definitions, rules, and examples that matter most for 4th Grade Science.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

4th Grade Science Flashcards: Predict Energy Changes From Speed

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QUESTION

What happens to an object's kinetic energy when its speed decreases (mass stays the same)?

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ANSWER

Its kinetic energy decreases. Since KE∝v2KE \propto v^2KE∝v2, lower speed means less energy.

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Flashcard 1: What happens to an object's kinetic energy when its speed decreases (mass stays the same)?

Answer: Its kinetic energy decreases. Since KE∝v2KE \propto v^2KE∝v2, lower speed means less energy.

Flashcard 2: Identify the correct claim: if two objects have the same speed, which one has more kinetic energy?

Answer: The object with greater mass has more kinetic energy. With equal speeds, KEKEKE is proportional to mass.

Flashcard 3: What is the most common energy change when a moving object slows down due to friction?

Answer: Kinetic energy changes into thermal energy (heat). Friction converts motion energy to heat through molecular collisions.

Flashcard 4: What happens to kinetic energy if an object's speed becomes 000?

Answer: Its kinetic energy becomes 000. No motion means no kinetic energy by definition.

Flashcard 5: If a moving object slows down to 000 m/s, what is its kinetic energy?

Answer: 000 J. No motion means no kinetic energy.

Flashcard 6: Which option has more kinetic energy: a cart moving at 666 m/s or the same cart at 333 m/s?

Answer: The cart at 666 m/s. Double the speed means more energy.

Flashcard 7: Which has more kinetic energy: a ball at rest or the same ball moving at 222 m/s?

Answer: The ball moving at 222 m/s. Moving objects have kinetic energy; still objects don't.

Flashcard 8: Which option has more kinetic energy: the same ball rolling faster or rolling slower?

Answer: The ball rolling faster. Higher speed means more kinetic energy.

Flashcard 9: Which has more kinetic energy: the same car at 101010 m/s or at 202020 m/s?

Answer: The car at 202020 m/s. Double speed means four times the energy.

Flashcard 10: Which has more kinetic energy: the same skateboard at 444 m/s or at 888 m/s?

Answer: The skateboard at 888 m/s. Double speed means four times the energy.

Flashcard 11: Which has more kinetic energy: same mass at 10 m/s10\text{ m/s}10 m/s or 5 m/s5\text{ m/s}5 m/s?

Answer: The object at 10 m/s10\text{ m/s}10 m/s. Higher speed means more kinetic energy for same mass.

Flashcard 12: If an object's speed decreases to 0 m/s0\text{ m/s}0 m/s, what is its kinetic energy?

Answer: 000 (no kinetic energy of motion). No motion means no kinetic energy.

Flashcard 13: Which has more kinetic energy: a 2 kg2\text{ kg}2 kg object at 4 m/s4\text{ m/s}4 m/s or a 4 kg4\text{ kg}4 kg object at 4 m/s4\text{ m/s}4 m/s?

Answer: The 4 kg4\text{ kg}4 kg object at 4 m/s4\text{ m/s}4 m/s. More mass means more kinetic energy at same speed.

Flashcard 14: Identify the relationship: when speed increases, does an object have more or less energy to cause change in a collision?

Answer: More energy (more kinetic energy). More kinetic energy means more impact force.

Flashcard 15: Which option best completes the rule: when speed decreases, kinetic energy becomes  .

Answer: Smaller. Lower speed always reduces kinetic energy.

Flashcard 16: Which option best describes energy change during braking: speed decreases, kinetic energy increases or decreases?

Answer: Kinetic energy decreases. Slowing down reduces v2v^2v2, thus reducing KEKEKE.

Flashcard 17: What happens to an object's kinetic energy when its speed increases (mass stays the same)?

Answer: Its kinetic energy increases. Since KE∝v2KE \propto v^2KE∝v2, higher speed means more energy.

Flashcard 18: Which has more kinetic energy: a 3 kg3\text{ kg}3 kg object at 2 m/s2\text{ m/s}2 m/s or a 3 kg3\text{ kg}3 kg object at 6 m/s6\text{ m/s}6 m/s?

Answer: The 3 kg3\text{ kg}3 kg object at 6 m/s6\text{ m/s}6 m/s. Higher speed means more kinetic energy for same mass.

Flashcard 19: What type of energy is the energy of motion called?

Answer: Kinetic energy. Energy from an object's motion or movement.

Flashcard 20: Which has more kinetic energy: same mass at 6 m/s6\text{ m/s}6 m/s or 3 m/s3\text{ m/s}3 m/s?

Answer: The object at 6 m/s6\text{ m/s}6 m/s. Higher speed means more kinetic energy for same mass.