What is Motion? Lesson 3

How does the child inside the train perceive the man's speed?

• 2 miles per hour

• 20 miles per hour

• 22 miles per hour

• 0 miles per hour

What is the reference point for people outside the train?

• The ground

• The train

• The man walking

• The child

If the train's speed increases to 30 miles per hour, how fast will the man appear to be moving to the child inside the train?

• 2 miles per hour

• 10 miles per hour

• 30 miles per hour

• 32 miles per hour

Why do people outside the train see the man moving at 22 miles per hour?

• Their reference point is the ground

• Their reference point is the train

• Their reference point is the man

• Their reference point is the child

What would happen to the perceived speed of the man if the train stopped moving?

• The child would see the man moving at 20 miles per hour

• The child would see the man moving at 22 miles per hour

• The child would see the man moving at 2 miles per hour

• The child would see the man not moving

Which of the following best describes the concept of relative motion?

• Different observers see different speeds based on their reference points

• All observers see the same speed regardless of their reference points

• Motion is only relative to the ground

• Motion is absolute and not relative

True or False: People can view the motion of one object differently.

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A reference point can be used to ​ (a)   how fast something moves ​ (b)   to another ​ (c)   . People can view the ​ (d)   of one object differently if they are using different reference ​ (e)   .

• compare
• relative
• object
• motion
• points

This woman is riding on a train. Why does it appear that the tree, buildings, and train tracks outside her window are moving, but her glasses and phone are not?

• The woman’s reference point is outside of the train, so objects outside of the train appear to be stationary.

• The woman’s reference point is inside the train, so objects outside of the train appear in motion.

• The woman’s reference point is inside the train, so objects inside the train appear stationary.

• The woman’s reference point is inside the train, so objects outside of the train appear to be stationary.

• The woman’s reference point is outside of the train, so objects outside of the train appear to be in motion.

​ (a)   explains why people standing in different places will see the motion of an object differently ​ (b)   on different reference ​ (c)   . The woman’s reference point is ​ (d)   the train. The motion of the objects will ​ (e)   differently to her than to someone who has a reference point of the ground.

• Relative motion
• depending
• points
• inside
• appear