Speed and Energy
applying more force to the toy car, placing the toy car on an elevated ramp, etc.
Ms. Meyer was heating up some soup for lunch in the microwave. She placed three spoons in the soup - one plastic, one metal, and one wood. She observed that the metal spoon became hot. How was the energy transferred from the water to the spoon?
Heat energy was transferred from the soup/hot water to the spoon.
One science fair project was to design a container that can keep an ice cube from melting for at least one hour. The available materials are aluminum foil, plastic wrap, and cotton fabric. What is the best way to define the problem?
A. Design a container that uses all available materials, without considering how long the ice cube lasts.
B. Create a container that looks nice.
C. Create a container that keeps the ice cube frozen for one hour, using only the available materials.
D. Build a container that uses as little materials as possible, regardless of if it keeps the ice cube from melting or not.
C. Create a container that keeps the ice cube frozen for one hour, using only the available materials.
How many variables should be changed in one experiment?
ONLY ONE!
How are speed and energy related?
The faster the speed, the higher the energy.
The slower the speed, the lower the energy.
Mrs. Mills shined a flashlight on a solar panel and observed that the solar panel produced electricity to power a small electric fan. How was energy transferred in her experiment?
Light energy from the flashlight was converted into electrical energy.
A team of environmentalists needs to design a method to filter dirty water for their camping trip. They have access to gravel, sand, and a coffee filter. The water must be clean enough to drink, and the filter must be easy to transport for camping and hiking. Which of the following options is the best solution based on the criteria and constraints?
A. build a large, heavy filter using all the materials, which is effective but difficult to transport.
B. create a small, portable filter using only the coffee filter and sand, which may not fully clean the water.
C. design a filter using a combination of sand, gravel, and the coffee filter, balancing effectiveness and portability.
D. use only the gravel to make a lightweight filter, even if it doesn't fully clean the water.
C. design a filter using a combination of sand, gravel, and the coffee filter, balancing effectiveness and portability.
What is a hypothesis?
an educated guess based on science that you think will happen in an experiment
Jasper rolled 2 toy cars down a ramp. Car 1 started at the top of the ramp and rolled to the bottom. Car 2 started halfway down the ramp and reached the bottom at a lower speed than Car 1.
Which toy car has more energy when it reaches the bottom?
Car 1 that started at the top of the ramp.
Mr. Tribble designed a simple electrical circuit that powered a small fan using a battery. After testing, he noticed that the fan did not spin as fast as he expected. Which of the following would be the best modification to improve the device's performance?
A. Replace the battery with one that has a higher voltage to increase the electrical energy available.
B. Decrease the number of wires in the circuit to reduce energy loss.
C. Replace the fan with a larger one to increase the motion energy.
D. Use thicker wires to decrease the resistance and slow down the fan.
A. Replace the battery with one that has a higher voltage to increase the electrical energy available.
Wind energy is renewable, but it can have some negative effects on local wildlife. Which of the following best describes one of these environmental impacts?
A. Wind turbines can cause significant air pollution during energy production.
B. The construction of wind turbines leads to the contamination of nearby water sources.
C. Wind turbines can pose a threat to birds and bats, which may be injured or killed by the blades.
D. Wind energy production depletes the local water supply, leading to habitat loss.
C. Wind turbines can pose a threat to birds and bats, which may be injured or killed by the blades.
Mr. Adkins' science fair project is testing to see which popcorn brand can pop the most kernels. What would be his independent variable (what does he change)?
the brand of microwaveable popcorn
Jasper rolled 2 toy cars down a ramp. Car 1 started at the top of the ramp and rolled to the bottom. Car 2 started halfway down the ramp and reached the bottom at a lower speed than Car 1.
What evidence statement supports the claim that one car has more energy than the other?
A. The cars were identical so their energy would be the same.
B. The car with the greatest speed would have more energy.
C. The slower car would have more energy because it is lighter.
D. The experimental set up doesn't allow for energy to be determined.
B. The car with the greatest speed would have more energy.
Ms. Craft was asked by Mrs. Woodford to design a solar-powered oven for the cafeteria that would convert sunlight into heat energy to cook food. During her first test, she noticed that the oven did not reach a high enough temperature. Which change would most likely improve the efficiency of her oven design?
A. increase the size of the oven to allow more sunlight to enter.
B. paint the interior of the oven black to better absorb and retain heat.
C. add more reflective materials inside the oven to reduce heat loss.
D. use clear plastic for the oven's cover to trap light energy.
B. paint the interior of the oven black to better absorb and retain heat.
Mrs. McQuerry had 2 students building paper airplanes after they checked out a library book. They decided to test different wing shapes to see which design would fly the furthest distance. Which is the best way to plan a fair test to identify which wing shape works best?
A. Test all wing shapes on different days with different wind conditions.
B. Change the wing shape and the paper type in each test to see how each variable affects the distance.
C. Have different students throw each different designed airplane to see how different throwing styles affect the distance.
D. Test each wing shape by throwing the airplane with the same force in a controlled environment, keeping all other variables controlled or constant.
D. Test each wing shape by throwing the airplane with the same force in a controlled environment, keeping all other variables controlled or constant.
Mr. Adkins' science fair project is testing to see which popcorn brand can pop the most kernels. What would be his dependent variable (what he is measuring)?
the amount of kernels popped in the bag
During a science experiment, Alexa notices that a car traveling at a higher speed causes a more significant impact on a block it crashes into. What evidence from this observation supports the relationship between speed and energy?
A. The car's energy decreases as it speeds up, causing a stronger impact.
B. The faster the car travels, the less energy it has, reducing the impact.
C. The car's greater speed results in more energy, which leads to a stronger impact.
D. The car's speed does not influence the energy transferred during the impact.
C. The car's greater speed results in more energy, which leads to a stronger impact.
Ms. Greenawalt and Ms. Bohman designed a wind turbine to generate electricity by converting wind energy into electrical energy. The initial design produced only a small amount of energy. Which modification would most likely improve the turbine's energy conversion?
A. Increase the number of blades on the turbine to capture more wind energy.
B. Reduce the size of the blades to decrease air resistance.
C. Move the turbine to a location with less wind to prevent damage.
D. Shorten the height of the turbine to make it easier to access.
A. Increase the number of blades on the turbine to capture more wind energy.
A. Solar energy produces more greenhouse gases than coal energy, leading to more pollution.
B. Coal energy is cleaner than solar energy because it requires less land use.
C. Solar energy has minimal environmental impacts compared to coal, which contributes to air and water pollution.
D. Both solar and coal energy have equal environmental impacts due to their energy production processes.
C. Solar energy has minimal environmental impacts compared to coal, which contributes to air and water pollution.
microwave, cook time, amount of popcorn (1 bag), size of package