Homework: Free fall and Weight
Free Falling Stone
1a. A stone is dropped from 448 m - approximately the height of Empire State Building. What is the time it takes for the stone to reach the ground (without air resistance)?
1b. What is the velocity of the stone when it hits the ground?
1c. How far has an object fallen after 6 seconds?
1d. How fast is an object going after falling for 12 seconds?
1e. How long (in seconds) does it take an object to fall distance of 20.0m?
A Ball Thrown Straight Up
2a. A ball is thrown straight up with an initial velocity of 25 m/s. What is the time it takes for the ball to stop before it starts falling downward?
2b. What is the distance traveled by the ball before it turns down?
Weight versus Mass
3. A car's mass is 1,644 kg. What is it’s he weight?
The Weight of a Body on Earth vs. Moon vs. Mars
4a. The acceleration of gravity on the moon is approximately 1/6 of the acceleration of gravity on the earth.
What is the weight of an object with mass 45.6 kg on the earth on Moon and on Mars?
4b. The acceleration due to the gravity on Mars is 3.8 m/s2. What is the weight of an object with mass 45.6 kg on Mars?
Speed
5. Marcy doesn't want to be late for class so she rushes to McDonald’s at lunch. How much time would it take Marcy to walk 2 km to McDonalds for a Big Mac if she walked at a rate of 4.5 km/h?
Acceleration
A roach moves down the hall at 1.2 m/s. When he sees the janitor coming down the hall, he begins to run. After 3.2 s, he is moving at 3.6 m/s. What is his acceleration?
Free Falling Stone
1a. A stone is dropped from 448 m - approximately the height of Empire State Building. What is the time it takes for the stone to reach the ground (without air resistance)?
1b. What is the velocity of the stone when it hits the ground?
1c. How far has an object fallen after 6 seconds?
1d. How fast is an object going after falling for 12 seconds?
1e. How long (in seconds) does it take an object to fall distance of 20.0m?
A Ball Thrown Straight Up
2a. A ball is thrown straight up with an initial velocity of 25 m/s. What is the time it takes for the ball to stop before it starts falling downward?
2b. What is the distance traveled by the ball before it turns down?
Weight versus Mass
3. A car's mass is 1,644 kg. What is it’s he weight?
The Weight of a Body on Earth vs. Moon vs. Mars
4a. The acceleration of gravity on the moon is approximately 1/6 of the acceleration of gravity on the earth.
What is the weight of an object with mass 45.6 kg on the earth on Moon and on Mars?
4b. The acceleration due to the gravity on Mars is 3.8 m/s2. What is the weight of an object with mass 45.6 kg on Mars?
Speed
5. Marcy doesn't want to be late for class so she rushes to McDonald’s at lunch. How much time would it take Marcy to walk 2 km to McDonalds for a Big Mac if she walked at a rate of 4.5 km/h?
Acceleration
A roach moves down the hall at 1.2 m/s. When he sees the janitor coming down the hall, he begins to run. After 3.2 s, he is moving at 3.6 m/s. What is his acceleration?