Honors Physics

# Questions - Week 4

1. What is the relationship between hypotheses and theories?
2. If you made a prediction (a hypothesis) then tested your prediction (an experiment) how could you describe how wrong your prediction is?
3. If you measured the mass to be 12.5 grams and your partner measured the mass to be 12.9 grams, what is your percent difference?
4. Theory predicts the speed to be 4.5 m/s but the measured speed was 5.8 m/s. What is your percent error?
5. If a girl starts at rest and accelerates up to a constant speed, what is the equation for her displacement? You shouldn't need your notes for this one.
6. Given distance and acceleration, how much time would it take you to accelerate over that distance, if you started from rest?
7. If a dog ran in front of your car while you were driving, it would take some time before your foot could reach the brakes to begin slowing your car. Assume your initial speed is 12 m/s and it takes 0.51 s to hit the brakes. If the car accelerates at 6.2 m/s2 what would be your stopping distance?
8. Drop a rock from a height of 6.0 m. If it has no initial velocity, how much time will it take before it lands?
9. Throw a ball straight up into the air. If it takes 6.4 s to come back down, what was its initial velocity?
10. Shoot a bullet straight upwards. After 23 s, the bullet is moving 72 m/s downwards. What was the initial velocity of the bullet? (Careful of signs.)
11. If a little cart rolled down a slope, moving 0.85 m in 1.14 seconds, what was its acceleration?
12. Drop a rock. If there is no air resistance, how fast will it be falling in 3.0 seconds?
13. Throw a ball straight upwards at 15 m/s. How high will it go?
14. How do we know when a measurement is "accurate"?
15. What is a fact?
16. What is a hypothesis?
17. To a scientist, what is wrong with the sentence, "It's only a theory"?