1. What is the primary purpose of distinguishing between a physical model and a real-world object in scientific analysis for a movie stunt?
- A. To reduce the overall budget of the film production.
- B. To ensure the model is visually indistinguishable from the real object on camera.
- C. To predict and compensate for differences in physical behavior due to scale.
- D. To prove that models are always superior to using real objects for stunts.
2. If a real car and a model car are both released down the same ramp, why might the model car appear to move differently, even ignoring air resistance?
- A. The model car is a different color.
- B. The ramp's angle is effectively steeper for the model.
- C. Frictional forces are different.
- D. The force of gravity does not affect models.
3. In the context of vehicle motion, which of the following best describes the force of friction?
- A. The force that propels a vehicle forward from its engine.
- B. The force that resists motion when two surfaces slide against each other.
- C. The force of gravity that holds a vehicle onto the road surface.
- D. The force generated by an object's momentum as it moves.
4. When creating a movie stunt with a scale model car, what are the two most critical physical properties that often differ from a real car and can make the stunt look unrealistic?
- A. The car's color and the brightness of its headlights.
- B. The model's top speed and the material of its windows.
- C. The vehicle's mass and the friction between its tires and the driving surface.
- D. The engine sound and the number of seats inside the model.
5. A movie director is frustrated because a model car used in a chase scene seems to accelerate unrealistically fast. What is the most likely scientific reason for this?
- A. The model car has significantly less mass than a real car.
- B. The frictional force on the model car is too high.
- C. The force of gravity is stronger on the movie set.
- D. The model car's tires are too wide for its body.
6. In an experiment testing how a car stops, if the only change made between trials is adding weight to the car, which variable is being investigated?
- A. Friction
- B. Speed
- C. Mass
- D. Surface texture
7. A student tests how surface material affects a toy car's stopping distance. They use the same car and release it from the same spot on a ramp for each trial, but test it on wood, tile, and carpet. In this experiment, what is the car's release spot an example of?
- A. The independent variable
- B. The dependent variable
- C. A controlled variable
- D. An experimental error
8. In a scientific experiment, what is the primary purpose of isolating a variable?
- A. To prove that the initial hypothesis is always correct regardless of the evidence.
- B. To ensure that only one factor is changed at a time, so its specific effect can be clearly observed.
- C. To make the experiment more complex by changing as many conditions as possible at once.
- D. To speed up the data collection process by testing multiple ideas simultaneously.
9. A student is investigating why a toy car slides too far on a ramp. To specifically test the effect of friction, which of the following changes should they make?
- A. Use a heavier car for the next trial.
- B. Make the ramp steeper.
- C. Cover the ramp's surface with sandpaper.
- D. Give the car a harder push at the start.
10. A scientist wants to determine if the mass of a model car was the reason it failed to stop in time. Which experiment would be the best way to test this?
- A. Roll the original car down ramps of varying steepness to see how its speed changes.
- B. Run the test again with the same car on a much rougher surface like carpet.
- C. Conduct two tests, one with the original car and one with a lighter car, keeping the surface and starting speed the same for both.
- D. Test a heavier car and a lighter car on two different surfaces to see which combination works best.