Motion and Stability

• Trail 1
• Trail 2
• Trail 3
• Trail 4

• Trail 5

A ball is rolling down a hill, and you notice that it rolls the same distance every 2 seconds. If the ball continues moving at the same speed, how far will it have rolled after 6 seconds? (5.PS2.2)

• The ball will roll half the distance it rolled in the first 2 seconds.
• B) The ball will roll three times the distance it rolled in the first 2 seconds.
• C) The ball will roll two times the distance it rolled in the first 2 seconds.
• D) The ball will stop moving after 4 seconds.

A 5th-grade class is conducting an experiment. The students drop different objects, like a ball, a pencil, and a feather, from the same height. Each object falls straight down to the ground. The teacher asks, "Why do all the objects fall toward the ground?" (5.PS2.3) Which of the following best explains why the objects fall toward the ground?

• A) The objects are being pulled toward the Earth's center by a force called gravity.
• B) The air is pushing the objects down to the ground.
• C) The objects are trying to reach the ground because that's where they belong.
• D) The wind is causing the objects to fall straight down.

Based on this data, which of the following best explains the relationship between the mass of the ball, the distance from the ground, and the gravitational pull? ( 5.PS2.4)

• A) Gravitational pull increases as the distance from the ground increases.
• B) Gravitational pull increases as the mass of the ball increases, but the distance from the ground does not change the gravitational pull.
• C) Gravitational pull decreases as the mass of the ball increases.
• D) Gravitational pull is affected only by how high the object is from the ground.

A student kicks a soccer ball across a grassy field. The ball slows down and eventually stops. Why does the ball stop?( 5.PS2.5)

• A) The ball runs out of energy.
• B) There is a force called friction between the grass and the ball that slows it down.
• C) The ball is too light to keep moving.
• D) The wind is pushing the ball in the opposite direction.

A student rolls a ball down a smooth hill and then tries rolling the same ball down a grassy hill. On which hill will the ball move faster, and why?( 5.PS2.5)

• A) The ball will move faster on the grassy hill because there is more friction.
• B) The ball will move faster on the smooth hill because there is less friction.
• C) The ball will move faster on both hills because gravity is the same.
• D) The ball will move faster on the grassy hill because it is rough.

• A) A second mover helps push with 250 Newtons of force in the opposite direction.
• B) The cabinet is pushed up to a wall, and 250 Newtons of applied force push back against it.
• C) A second mover helps push with 250 Newtons of force in the same direction as the first mover.
• D) The mover stops pushing the cabinet, and leaves it sitting at rest.

• A) The player’s foot kicking the ball creates balanced forces, causing the change in motion.
• B) The player’s foot applies an unbalanced force to the ball, causing the change in motion.
• C) The ball applied an unbalanced force to the player’s foot, causing the change in motion.
• D) The player’s foot applies an unbalanced force to the ball, but causes no change in motion.

• A) B, C, B, A
• B) A, B, C, B
• C) B, A, C, B
• D) B, A, B, C

• A) 1.6 meters
• B) 0.6 meters
• C) 1.0 meters
• D) 1.2 meters