1. A student is riding her bicycle down the street. She passes the mailman pulling mail from the corner mailbox. To the mailman, how does the student appear to move?

• forward

• backward

• she does not appear to be moving

• in the same direction as the mailman

As you are riding in our car down the road, how do the light poles appear to move?

• forward

• backward

• They are stationary and do not move

• In the same direction as you

Shaun’s mother walks with him to the bus stop every morning. When the bus pulls up, Shaun gets on as his mother waves goodbye. As the bus pulls out, Shaun sees her still waving. To Shaun, how does his mother appear to move?

• forward

• backward

• She is standing still and doesn’t appear to move

• In the same direction as Shaun

Justin was sitting in the school bus, which was parked in front of the school. Another bus pulled up beside him and stopped to wait for a pedestrian to cross in front of it. His friend, Elijah, was on the other bus. After the walker crossed, Elijah's bus pulled out. To Elijah, how does it appear that Justin's bus is moving?

• From Elijah’s frame of reference, Justin’s bus is not moving

• From Elijah’s frame of reference, Justin’s bus is moving forward

• From Elijah’s frame of reference, Justin’s bus is moving backward

• not enough information to tell.

A passenger walks 4 km per hour toward the front of a train that is moving 50 km per hour. What is her motion as seen from the reference point of a passenger seated in the same train.

• She is not moving

• She is moving 2 km per hour

• She is moving 4 km per hour

• She is moving 54 km per hour

A passenger walks 4 km per hour toward the front of a train that is moving 50 km per hour. What is her motion relative to someone standing next to the tracks as the train passes by.

• She is not moving

• She is moving 4 km per hour

• She is moving 50 km per hour

• She is moving 54 km per hour

A ball is dropped from the top of a tall building. As the ball falls, the upward force of drag becomes equal to the downward pull of gravity. When these two forces become equal in magnitude, the ball will

• flatten due to the forces.

• fall at a constant speed.

• continue to speed up

• slow to a stop.

Tags

NGSS.MS-PS2-2

Four identical tennis balls are dropped at the same time and from the same height. Which ball will land first?

• Ball 1

• Ball 2

• Ball 3

• Ball 4

Tags

NGSS.MS-PS2-4

Four identical tennis balls are dropped at the same time and from the same height. Ball 4 lands first. Why?

• the parachute is bigger, producing more drag.

• the parachute is smaller, producing less drag.

• the parachute is circular, producing more drag.

• the parachute is a rectangle, producing less drag.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The diagram shows a car on a track that is lying on the floor. Identify the net force when the car is at rest.

• Zero Net Force

• Arrow Up

• Arrow Right

• Arrow Down

• Arrow Left

Tags

NGSS.MS-PS2-2