Vocabulary
what is Energy
The Capacity or ability to do work or cause change.
A basketball is sitting still. A student throws it across the gym. What happened to the basketball's kinetic energy? Explain what caused the change.
Its kinetic energy increased because the ball went from being still to moving. Energy was transferred to the basketball when the student threw it.
A toy car rolls across the floor and eventually stops. If its kinetic energy decreased, where could some of that energy have gone?
Some energy was transferred to thermal energy because of friction. Some may also have been transferred as sound.
A student says, "If an object stops moving, it has no energy." Why is this statement incomplete?
The object has no kinetic energy if it is not moving, but that does not mean it has no energy at all. Energy may have been transferred into other forms or may exist in other forms.
where did i go to school
UNI
what is Kinetic energy
Is the energy of moving
A bowling ball and a tennis ball are both rolling at the same speed. The bowling ball has much more mass. Which object has more kinetic energy?
The bowling ball has more kinetic energy because it has greater mass while moving at the same speed
A skateboard slows down because of friction between its wheels and the ground. What evidence could show that energy was transferred?
The skateboard slows down, showing that its kinetic energy decreased. The wheels or other parts could also become slightly warmer, providing evidence of energy transfer.
A student pushes a box across the floor. The box speeds up at first, but eventually the student stops pushing and the box slows down. Describe the energy transfers during both parts.
While the student pushes, energy is transferred to the box, increasing its kinetic energy. After the student stops pushing, friction transfers energy away from the box's motion, so its kinetic energy decreases.
How many pets do I have
1 dog 1 cat, and now fish
This is an example of
Is a proposed statement, conclusion or generalization about how the natural world works that must be tested, proven or supported with empirical data and logic.
what is claim
A student says, "An object that is moving slowly cannot have much kinetic energy because speed is the only thing that matters." Do you agree or disagree?
Kinetic energy depends on both mass and speed. A very massive object moving slowly can have more kinetic energy than a lightweight object moving faster.
A rubber ball hits the floor and bounces. Each bounce is lower than the one before it. What does the decreasing height tell you about the ball's energy?
The ball is not keeping all of its energy as motion. Some energy is being transferred to thermal energy, sound, and the surroundings during each bounce.
A basketball is dropped from a height. It hits the floor and bounces back up, but it does not return to its original height. What evidence suggests that energy was transferred during the collision?
The ball does not bounce back to its original height, showing that its motion changed. Some energy was transferred to sound, thermal energy, and the surroundings.
What is my dog's name
Crispy
An item against which the motion of an object can be measured.
Frame of Reference
A car is traveling down a road when the driver applies the brakes. The car slows down, and the brakes become warmer. Explain how these observations provide evidence that energy was transferred.
The car's kinetic energy decreased as it slowed down. At the same time, the brakes became warmer, showing that some energy was transferred into thermal energy in the brakes
A student drops a ball. It hits the floor and makes a sound while the ball becomes slightly warmer. Explain how these observations provide evidence of energy transfer.
The ball's motion changes during the collision, so its kinetic energy changes. The sound and temperature increase are evidence that energy was transferred into other forms.
Two identical toy cars are released from different heights on the same ramp. The car released from the higher position reaches the bottom moving faster. Construct an argument explaining why.
The car released from the higher position reaches the bottom with greater kinetic energy because it is moving faster. The evidence is that it has the greater speed at the bottom. The change in motion provides evidence that energy was transferred to the car's motion.
What is my cats name and age
lighting 14
what is velocity
The speed and direction of moving objects
A student says, "When the car stopped, its kinetic energy disappeared." What is wrong with this explanation?
Energy did not disappear. The car's kinetic energy decreased, and energy was transferred to other forms, including thermal energy in the brakes, tires, road, and surroundings. A change in kinetic energy means energy was transferred
A pendulum swings back and forth. Each swing is slightly lower than the previous swing until it stops. Construct an explanation for where the pendulum's kinetic energy was transferred
As the pendulum slows, its kinetic energy decreases. Some of that energy is transferred to thermal energy because of friction and air resistance, and some is transferred as sound. Eventually, the pendulum stops.
A student claims: "Friction destroys kinetic energy." Do you agree or disagree? Defend your answer.
Disagree. Friction does not destroy energy. It causes energy to be transferred from the object's motion into other forms, especially thermal energy. The object's kinetic energy decreases while the surroundings can become warmer.
What is my top 2 go-to hobbies?
crochet or reading