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Free Fall (Sect 2.3)
to review free fall
| Question | Answer |
|---|---|
| What does the expression FREE FALL mean exactly? | It refers to an object falling without accounting air resistance. |
| How does objects' speed change when moving whether upward or downward? | The objects' speed decreases while moving upward, and increases while moving downward. In both cases the object's speed changes at the same rate. |
| Is acceleration due to gravity zero when the object reaches its maximum height? | Acceleration due gravity is always constant, regardless the position the object is at a particular time. |
| Approve or disprove the following statement: In free fall, the time required to get to the maximum height is much less than the time required to fall from the same height. | This statement has to be disproved, since both times are exactly equal considering free fall conditions. |
| What consideration should be made regarding speed, once an object has reached its maximum height? | The object's speed is to be ZERO |
| What consideration should be made regarding velocity of an object when passing the same position on its way up and on its way down? | Both velocities are equal in magnitude, but opposite in direction. |
| If an object was thrown upward with an initial velocity of + 4.5 m/s, what is the object's final velocity when it's returning to the thrower's hand? | It must be - 4.5 m/s |
| Complete the following sentence: in absence of air resistance, all objects... | will accelerate at the same rate, regardless the mass. |
| How fast an object hits the ground below depends on... | how fast it was thrown vertically downward, or how high above its initial position is. |
| The time it takes an object to reach its peak depends on... | how fast it was thrown, in other words, it depends on the initial velocity the object is given |
| The position time graph of an object falling down will look like | a curved line that is concave and located in the negative Y-axis |
| The velocity-time graph of an object that was thrown vertically upward, will look like | A straight line that begins at some point on the velocity axis, and has a negative slope. the initial and final velocities are equal in magnitude but opposite in sign. |
| The acceleration-time graph of an object whether going upward or downward will look like | a horizontal line that is parallel to the time axis. |
Created by:
jcfajardo
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