Name: ______

Gizmo Lab: Fan Cart Physics – Alternate Assignment

1. A fan cart with the fan set to high rolled across a floor. The cart's speeds are shown below. If the fan were set to medium instead, what could the cart's speed be at 5 seconds?

a. 10.9 cm/s

b. 31.0 cm/s

c. 40.1 cm/s

d. 48.3 cm/s

2. Force is needed:

a. for a moving object to keep moving at the same speed and direction

b. For a moving object to change its speed

c. For a motionless object to remain still

d. to prevent an object from turning

3. Rebecca puts her backpack on a fan cart and turns the fan on. She then measures the speed each second afterward. At 10 seconds the cart has a speed of 20 cm/s. How fast will the cart be moving at 12 seconds?

a. 18 cm/s

b. 20 cm/s

c. 22 cm/s

d. 24 cm/s

4. A fan cart is moving on a frictionless surface. If you change the fan speed from high to low, what will occur?

a. The cart will stop moving.

b. The cart will slow down.

c. The cart will keep moving at the same speed.

d. The cart will continue to speed up, but not as quickly as before.

6. The acceleration of the cart shown below is represented in the given graph. If a second block is added to the cart, what might be the resulting acceleration?

a. 0 m/s/s

b. 0.27 m/s/s

c. 0.4 m/s/s

d. 0.53 m/s/s

7. A cart is set up as shown below, with three fans directed to the left and two of the fans running. The motion of the cart is represented by the v vs t graph shown. If the experiment were repeated with all three fans running, what might the resulting v vs t graph look like?

8. When a fan car has three times the number of fans (three times the force), how is acceleration affected?

a. It is 1/3 the original value

b. It is ½ the original value

c. It isn’t affected

d. It is twice the original value

e. It is triple the original value

9. Which of the following cart configurations could produce the x v t graph shown?

10. A cart with one fan blowing to the left and carrying one block produces the x vs t graph shown. If this cart were carrying three blocks instead of one, with the fan still blowing the same direction, what could the x vs t graph look like?

Use the following data table to help write the following conclusion.

Load / Number of fans turned on / Acceleration
3 fans, 0 mass units / 1 / 0.60
3 fans, 0 mass units / 2 / 1.20
3 fans, 0 mass units / 3 / 1.80
3 fans, 2 mass units / 1 / 0.20
3 fans, 2 mass units / 2 / 0.40
3 fans, 2 mass units / 3 / 0.60

Write a scientific explanation about why a pilot must know the mass of his passengers, luggage, fuel, plane, etc in order to successfully take off down a runway.

Claim: ______

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Evidence:______

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Reasoning:______

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