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중학교 1–3학년
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1
What is the primary purpose of a particle model in physics?
A
To describe the chemical composition of an object
B
To calculate the force acting on an object
C
To show the exact shape and color of a moving object
D
To represent an object as a series of dots at equal time intervals
2
A particle model shows a car moving along a straight road. The dots are spaced equally. What can you conclude about the car's motion?
A
The car is changing direction
B
The car is decelerating
C
The car is moving at a constant speed
D
The car is accelerating
3
Two particle models are made for two different toy cars moving along a track. In Model A, the dots are farther apart than in Model B. Both models use the same time interval. What does this tell you about the speeds of the cars?
A
Car A is faster than Car B
B
The models do not provide information about speed
C
Car B is faster than Car A
D
Both cars have the same speed
4
Which of the following is a limitation of a particle model?
A
It does not show the size or shape of the object
B
It cannot represent objects moving at high speeds
C
It cannot show the direction of motion
D
It cannot show changes in speed
5
A student creates a particle model of a ball rolling down a ramp. The dots are initially close together and then become farther apart. What does this indicate about the ball's motion?
A
The ball is speeding up
B
The ball is slowing down
C
The ball is moving at a constant speed
D
The ball is moving backwards