Big Idea 12 and 13

This graph shows the motion of an object. Which best describes the motion of the object?

• It is sitting still.

• It is moving at a constant speed.

• It continually increases its speed.

• It travels at constant speed and suddenly stops.

Tags

NGSS.MS-PS3-1

Which investigation will best test the effects of gravity on moving objects?

• pencils falling from the same height

• balloons floating upward from the same height

• a bicycle speeding up on a flat surface

• a ball slowing down on a flat surface

Tags

NGSS.MS-PS2-2

Carey left a bowling ball and kickball outside on a windy day. Which best explains why the kickball moved but the bowling ball did not?

• The kickball has less mass so it was easier to move.

• The force of gravity acting on the bowling ball is greater.

• The mass of the kickball is greater so it is easier to move.

• The force of gravity acting on the kickball is greater.

Tags

NGSS.MS-PS2-2

Rosa tried to pound a large nail into a board using a small hammer. Partway into the board, the nail stopped and would not move when she hit it. Rosa switched to using a heavier hammer, and the nail went into the board easily. Why did the larger hammer work when the small hammer did not?

• The nail could not push the larger hammer out of the way.

• There is more friction between a large hammer and the nail.

• The flat part of the larger hammer was wider, so it hit the nail better.

• The larger hammer had more mass, so it exerted more force when it hit the nail.

Tags

NGSS.MS-PS2-2

Suri places magnets on three identical toy cars to give them different masses. Then, Suri measures how far each car rolls when she launches it from the same starting point using the same stretched rubber band. The three toy cars are pictured in the following illustration. How will the force of the rubber band affect the cars?

• Car 3 will travel the longest distance.

• Car 1 will travel the shortest distance.

• Car 3 will have the least change in its motion.

• Car 1 will have the greatest change in its motion.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

Tori tests how far three identical toy cars travel under three different conditions. The following diagram shows the conditions before each car is released. How is Tori controlling variables in her experiment?

• The mass and force will change for each trial.

• Neither the mass nor force will change for each trial.

• The mass will change for each trial, but the force will not change.

• The force will change for each trial, but the mass will not change.

Tags

NGSS.MS-PS2-2

Katie sits on the ground and rests her hands on a bowling ball in front of her. She uses all her force to push the bowling ball away from her body. Next, Katie rests her hands on a soccer ball situated in front of her at the same location. She uses all her force to push the soccer away from her body. How does the movement of the two balls contrast?

• The soccer ball accelerates faster and moves a greater distance because more force is acting on it.

• The soccer ball accelerates faster and moves a greater distance because it has less mass.

• The bowling ball accelerates faster and moves a greater distance because it has more mass.

• The bowling ball accelerates slower and moves a shorter distance because less force is acting on it.

Tags

NGSS.MS-PS2-2

Kaneesha pushes a toy truck and lets it roll across a flat surface. She measures the distance it travels. Kaneesha repeats this for several trials, using the same amount of force each time, but she adds different numbers of wood blocks of identical mass to her truck. Kaneesha’s results are shown in the following table. Which measurement is likely to be closest to the result for Kaneesha’s trial with 2 wood blocks?

• 12 cm

• 30 cm

• 57 cm

• 98 cm

Tags

NGSS.MS-PS2-2

Bianca pushes an empty box across a flat surface with little effort. She then fills the box up with books and tries to push it. What will most likely happen?

• The box will be easier to move because Bianca’s push will have less effect on the heavier box.

• The box will be easier to move because Bianca’s push will have a greater effect on the heavier box.

• The box will be harder to move because Bianca’s push will have less effect on the heavier box.

• The box will be harder to move because Bianca’s push will have a greater effect on the heavier box.

Tags

NGSS.MS-PS2-2

A rock is balanced on the side of a long, sloping hill. Although the rock is very heavy, a gentle push causes it to start moving down the slope. How can a small force cause a large mass to move?

• To make an object move, the direction of the force is important, but not the amount of force.

• The push on the rock increased the amount of friction, so the rock started to move.

• The small push balanced the forces that were keeping the rock in place and caused it to move.

• The forces on the rock were balanced, and a small additional force caused them to be unbalanced.

Tags

NGSS.MS-PS2-2