Factors that Affect Kinetic Energy Quick Check
Science 8 Q1 / Energy of Motion
A student drops a basketball into a pool from a height of 5 meters while a friend records the approximate splash height. They want to make a bigger splash in their next trial. How can they achieve this?(1 point)
Responses
They can drop the same ball from a lower height.
They can drop the same ball with less speed.
They can use a ball with the same diameter but less mass.
They can use a ball with the same diameter but more mass.
Which characteristic will be affected by increasing the speed of an object from 30 meters per second (ms) to 40 meters per second(ms)?(1 point)
Responses
weight
gravitational attraction
mass
kinetic energy
Use the table of information to answer the question.
Fruit Mass (kg) Speed (m/s)
Watermelon A 4 2
Watermelon B 4 4Two watermelons fall off a kitchen counter. The masses and speeds of the fruits are in the table. How do the kinetic and/or the potential energies of the fruits compare?(1 point)
Responses
Both fruits have the same kinetic and potential energy.
The watermelon A has more kinetic energy.
Both fruits have only potential energy and no kinetic energy.
The watermelon B has more kinetic energy.
A student drops a 350-gram rock and a 500-gram rock into a pool from a height of 8 meters. Which statement about the investigation is accurate?(1 point)
Responses
The 350-gram rock causes a larger splash because it has less mass.
The 500-gram rock causes a smaller splash because it has more mass.
The 500-gram rock causes a larger splash because it has more kinetic energy.
The 350-gram rock causes a smaller splash because it has more kinetic energy.
Use the table of information from a student's investigation to answer the question.
Object Splash Size Ranking
W 2
X 4
Y 1
Z 3
A student drops several objects of the same size into a bucket of water from a height of 2 meters. She ranks the splash size from 1-4, with 1 being the smallest splash and 4 being the largest splash. Which object most likely has the greatest mass?
(1 point)
Responses
object Y
object Z
object W
object X
what is the correct answer ot all 5 questions
1. They can use a ball with the same diameter but more mass.
2. kinetic energy
3. The watermelon B has more kinetic energy.
4. The 500-gram rock causes a larger splash because it has more kinetic energy.
5. object Z
1. How can the student achieve a bigger splash in their next trial?
- They can drop the same ball from a lower height.
2. Which characteristic will be affected by increasing the speed of an object from 30 m/s to 40 m/s?
- The kinetic energy
3. How do the kinetic and/or potential energies of Watermelon A and Watermelon B compare?
- The watermelon B has more kinetic energy.
4. In the investigation with a 350-gram rock and a 500-gram rock, which statement is accurate?
- The 500-gram rock causes a larger splash because it has more kinetic energy.
5. Which object most likely has the greatest mass, based on the splash size ranking?
- Object X
1. To achieve a bigger splash in their next trial, the student can drop the same ball from a higher height. This is because the higher the height, the greater the potential energy the ball will have, which will translate into a larger kinetic energy upon impact with the pool.
2. Increasing the speed of an object from 30 meters per second (m/s) to 40 m/s will affect its kinetic energy. The correct answer is kinetic energy. Kinetic energy is directly proportional to the square of the object's speed, so increasing the speed will result in an increase in kinetic energy.
3. Both fruits, Watermelon A and Watermelon B, have the same potential energy due to their equal masses (4 kg) and equal heights. However, the kinetic energy of the watermelon B is greater because it has a higher speed (4 m/s) compared to the watermelon A (2 m/s). Therefore, the correct answer is the watermelon B has more kinetic energy.
4. When dropping the 350-gram rock and the 500-gram rock from a height of 8 meters, the rock with more mass (500 grams) will cause a larger splash because it has more kinetic energy. The correct answer is the 500-gram rock causes a larger splash because it has more kinetic energy.
5. Based on the given splash size ranking, the object with the largest splash (ranked 4) most likely has the greatest mass. Therefore, the correct answer is object X.