3. If a vector that is 1 cm long represents a velocity of 10 km/h, what velocity

Question

3. If a vector that is 1 cm long represents a velocity of 10 km/h, what velocity does a vector 2 cm long drawn to the same scale represent?

4. When a rectangle is constructed in order to add velocities, what represents the resultant of the velocities?

5. Why do we say a rectangle is a special case of a parallelogram?

6. Will a vector at 45 degree to the horizontal be larger or smaller than its horizontal and vertical components? By how much?

7. Why does a bowling ball move without acceleration when it rolls along a bowling alley?

8. In the absence of air resistance, why does the horizontal component of vertical components of velocity for a projectile remain constant while vertical components change?

9. How does the downward component of motion of a projectile compare with the motion of freefall?

10. At the instant a ball is thrown horizontally over a lever range, a ball held at the side of the first is released and drops to the ground . If there is no air resistance, which ball hits the ground first?

11. How far below an initial straight line path will a projectile fall in one second?

12. At what angle should a slingshot be oriented for maximum altitude? Maximum horizontal range?

13. With no air resistance, if you throw a ball straight up with a speed of 20 m/s, how fast will it be moving when you catch it?

14. NO AIR RESISTANCE.

a.)      If you throw a ball at 20 m/s to your friend who is on first base, will the catching speed be greater/less/equal than 20 m/s?

b.)      Does the speed change if air resistance IS a factor?

15. What do we call projectile motion that continually “falls” around the earth?

16. How fast must a projectile moving horizontally travel so that the curve it follws matches the curve of the Earth?

Explanation / Answer

3) If a vector that is 1 cm long represents a velocity of 10 km/h then the velocity vector which is 2 cm long drawn to the same scale represents 20 km/h 4) A rectangle which is constructed in order to add velocities then the resultant of the velocities is zero. Post the remaining questions as separate.

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