unit 6.4 test review

1.  A farmer wants to protect her tomatoes from damage during storage, when boxes of tomatoes have to be stacked upon each other. Each box of tomatoes weighs about 2 kg when filled. She is considering several different box designs, and will investigate to determine which box works best to protect her tomatoes.

The farmer plans the following investigation:

• Fill each different box design with tomatoes 

• Place a 2 kg weight onto each tomato box (Figure 1)

• After 1 minute, remove the 2 kg weight

• Open the tomato box and count how many tomatoes are damaged

The purpose of the farmer’s investigation is to determine __________. Choose one answer below.

• which box holds the most tomatoes

• the mass of a box of tomatoes

• how much damage tomatoes experience during storage

• which box will protect her tomatoes from damaging forces

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

NGSS.MS-ETS1-4

In the investigation, the different box designs are the: . Choose one answer below.

• independent variable (what the farmer will change)
• dependent variable (what will change as a result)

• control (what will be kept the same each time)

In the investigation, the number of damaged tomatoes is the: . Choose one answer below.

• independent variable (what the farmer will change)

• dependent variable (what will change as a result)
• control (what will be kept the same each time)

Describe how the investigation makes sure that the same magnitude (amount of) test force is applied to each different box design.

Tags

NGSS.MS-PS2-2

How can the farmer's investigation help her determine the best box to protect the tomatoes?

• By analyzing the durability of each box

• By checking the color of the boxes

• By measuring the weight of the tomatoes

• By counting the number of tomatoes

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

Although her tomato boxes sometimes have many boxes stacked on top of them, the farmer is testing the tomato box designs by stacking only a single 2 kg box on top. She reasoned that: “It doesn’t matter how many boxes I stack on the tomato box, because only one box contacts the tomato box. So, only the force of one box can act on the tomato box.”

Your next task is to use a model to determine how stacking additional boxes on the tomato box would affect the force applied to the tomato box.

Complete the force models in Figure 2, using arrows on the box contact point (filled circles) to represent force magnitudes and directions: - one 2 kg weight (left) - two 2 kg weights (right)

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Use your completed models in Figure 2 to describe how stacking additional 2 kg weights would affect the total force acting on a tomato box.

• The total force remains the same regardless of the number of boxes stacked.

• The total force increases with each additional box stacked.

• The total force decreases with each additional box stacked.

• The total force is only affected by the bottom box.

Tags

NGSS.MS-PS2-2

2.  For a classroom competition, student groups have been given a problem to solve: use a catapult to launch a rock that hits the model castle (Figure 3).

If the catapult launch force (pull-back distance) does not change, which of the following statements is true about the rock MASS?

• a. The travel distance will be the same for every rock mass.

• b. The larger the rock mass, the greater distance the rock travels.

• c. The smaller the rock mass, the greater distance the rock travels.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

If the rock mass does not change, which of the following statements is true about the launch FORCE? Choose one answer below.

• a. The travel distance will be the same for every launch force magnitude.

• b. The larger the launch force magnitude, the larger the distance the rock travels.

• c. The smaller the launch force magnitude, the larger the distance the rock travels.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A group of students launch a rock at the castle, but it falls short (Figure 5). They wonder how they could change components of the system to hit the castle and solve the problem!

Identify what change to the mass, if any, they can make to the catapult system to hit the castle. Choose all answers that apply.

• Use a rock with more mass.

• Use a rock with less mass.

• The mass of the rock does not affect the distance it travels.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2