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INITIAL QUIZ 1)
If after two consecutive displacements your are back at the initial
point, how do the magnitudes of those displacements compare?
What about three displacements? 2)
From the roof of a building you throw a ball up with all your strength,
and you throw another one down with all your strength. Which one will be moving
faster when it hits the ground below? 3)
The cable in the elevator breaks and you start falling down in free fall.
Can you save your life by jumping up just before hitting the floor?
Why not? 4)
If you go to the moon is your weight there smaller than on Earth? How
about your mass? 5)
You have to push a very
heavy crate across the floor. Is it better to push horizontally or at an angle?
At what angle? 6)
Why do we need different gears in a car? 7)
You start a pendulum by raising its initial position 50cm above its
equilibrium position, and releasing it. How high will it go on the other side? 8)
You are in the middle of a perfectly
smooth frozen pond. How do you manage to get to the edge? 9)
Why is it harder to spin when you hold your arms extended? 10)
A cannonball and a marble roll down a hill? Which wins? 11)
Why do tightrope walkers
hold long balancing poles? 12)
What happens to the
frequency of a swing when the amplitude of its oscillations diminishes?
13) A ladder is at rest with its upper end against a wall and its lower. Is it more likely to slip when someone stands on it at the top or at the bottom?
14) A satellite in Earth orbit experiences a small drag force as it starts to enter the Earth's atmosphere. What happens to its speed?
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