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Checkpoint 2

QuestionAnswer
A student wants to know whether the amount of sunlight affects how tall a plant grows. She puts one plant in full sunlight and one in a dark room. She gives both plants the same amount of water. Question: What is the independent variable? The amount of sunlight
A scientist tests a new fertilizer on 20 plants. Ten plants receive the fertilizer and ten do not. Question: What is the control group? Answer: The 10 plants that do not receive fertilizer.
A student predicts that increasing the temperature will make a chemical reaction happen faster. Question: What is the student's prediction? Answer: The reaction will happen faster at a higher temperature.
A 10 kg box is pushed with a net force of 50 N. Question: What is the box's acceleration? Answer: 5 m/s²
A 5 kg skateboard accelerates at 4 m/s². Question: What net force is acting on it? Answer: 20 N
A soccer ball is sitting still on the grass. A player kicks it, causing it to move. Question: Were the forces on the ball balanced or unbalanced when it was kicked? Answer: Unbalanced.
Two students pull a box in opposite directions. One pulls with 30 N and the other pulls with 30 N. Question: What is the net force? Answer: 0 N, so the forces are balanced.
A student pushes a chair forward with 40 N while friction pushes backward with 15 N. Question: What is the net force? Answer: 25 N forward.
A runner travels 100 meters in 20 seconds. Question: What is the runner's speed? Answer: 5 m/s
A car travels at 20 m/s for 10 seconds. Question: How far does the car travel? Answer: 200 m (distance = speed × time)
A cyclist travels 300 meters at 10 m/s. Question: How long does the cyclist travel? Answer: 30 seconds (time = distance ÷ speed)
Two runners are shown on a distance-time graph. Runner A's line is steeper than Runner B's. Question: Which runner is moving faster? Answer: Runner A.
A car's velocity increases from 10 m/s to 30 m/s in 5 seconds. Question: What is its acceleration? Answer: 4 m/s² (acceleration = change in velocity ÷ time)
A bicycle slows from 12 m/s to 4 m/s in 2 seconds. Question: What is its acceleration? Answer: −4 m/s², meaning it is slowing down.
A swimmer pushes water backward with her arms. Question: What happens to the swimmer because of the reaction force? Answer: The water pushes the swimmer forward.
A skateboarder jumps off a skateboard by pushing backward on it. Question: What happens to the skateboard? Answer: It moves forward.
A rocket pushes exhaust gases downward. Question: What force causes the rocket to move upward? Answer: The exhaust gases push the rocket upward with an equal and opposite reaction force.
A roller coaster is sitting at the top of a hill before it starts moving. Question: What type of energy is greatest? Answer: Gravitational potential energy.
The roller coaster begins moving down the hill. Question: What happens to its potential energy? Answer: It is transformed into kinetic energy.
Created by: user-2065249
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