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Physics, Science
10th
grade
Week 4 - Physics - Force & Work Assignment
11 questions
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- 1. Multiple Choice
Calculate the net force being exerted on my fridge, of a mass of 105 kg, when it's pushed across the floor with an acceleration of 3.00 m/s2. Don't ask me how the neighbouring zoo's gorilla got into my house, nor why it is so interested in my fridge. I do not have answers to these questions. Let's do some physics about it, instead!
35 N
315 N
0.029 N
470 000 N
- 2. Multiple Choice
When zoo officials came to collect Sergeant Pepper, she increased the force she was applying to the fridge to 500 N, and took off down the street, singing as she went: "It's wonderful to be here/ It's certainly a thrill/ You're such a lovely audience..." Calculate the acceleration of my fridge as Sergeant Pepper sped past my stunned neighbours on a sunny, May afternoon. Keep in mind that my fridge still has a mass of 105 kg (miraculously, no food has fallen out of it yet).
722 m/s2
0.21 m/s2
4.76 m/s2
52 500 m/s2
- 3. Multiple Choice
When Sergeant Pepper raced around the corner at the end of the street, my fridge almost fell over, and all of the meals I had prepared for the week fell onto the sidewalk- a tragedy!! Sergeant Pepper continued to apply the same force on my fridge (500 N), but now was able to increase the fridge's acceleration to 6.00 m/s2. Calculate the mass of food that Ms. Livingston has to cry over on her neighbour's lawn. (Hint: the original mass of the fridge, before food tragically fell out of it, was 105 kg)
21.7 kg
83.3 kg
105 kg
0 kg
- 4. Multiple Choice
Calculate the amount of work done on my fridge by Sergeant Pepper if she pushed it with a force of 500 N over a distance of 30 m down the street.
15 000 J
17 J
0.06 J
42
- 5. Multiple Choice
What amount of force is required to push my fridge 80 m back to my house, using a total amount of 2 400 J of work?
42
192 000 N
0.033 N
30 N
- 6. Multiple Choice
How far along the road did the zookeepers push my fridge if they did 2 400 J of work on it through applying a force of 100 N?
The acceleration due to gravity is g = 9.81 m/s2.
0.042 m
24 m
42
240 000 m
- 7. Multiple Choice
Finally, Sergeant Pepper was caught and safely returned to the zoo. To get her there, the zookeepers lifted her into the back of their Zoo Truck using a crane. The crane did a total of 225 J of work to lift her 3.00 m into the air (against the force of gravity), at an acceleration of 0.65 m/s2. What is the mass of Sergeant Pepper?
0.0087 kg
49 kg
42
115 kg
- 8. Multiple Choice
Did you think we were done? No way! We have more analyzing to do, physics-style! :)
When Ms. Livingston's food fell out of the fridge at the corner (*tears*), some fell from the top shelf, including her container of spaghetti sauce. If it hit her neighbour's lawn with a force of 49 N before splattering all over her neighbour's driveway, calculate the mass of spaghetti sauce that Ms. Livingston now has to mourn (ignore the mass of the container).
0.20 kg
481 kg
42
5.0 kg
- 9. Multiple Choice
If it took 1.3 seconds for the container to fall from the top shelf of the fridge to the lawn, what was its final velocity right before it landed?
7.5 m/s
13 m/s
0.13 m/s
42
- 10. Multiple Choice
Ms. Livingston cleaned up her food from her neighbour's lawn, wondering how on earth her day had managed to take this beyond-unexpected turn. Even though her musings caused her to meander, she was able to collect 18 kg of what had fallen. However, her philosophizing made her tired, so she only had 200 J of energy to lift her collection 1.3 m into the air (shoulder height). Does Ms. Livingston have enough energy to complete this work??
Yes, she has 2.4 J of extra energy! :)
Yes, she has 30 J of extra energy! :)
No, she is 30 J short on energy! :(
No, she is 2.4 J short on energy! :(
- 11. Multiple Choice
Having failed to clean up the mess from her neighbour's lawn, Ms. Livingston decided it was time to go to bed- some days just require a reset like that. Upon re-entering her home, she was reminded of just how rambunctious Sergeant Pepper had been while racing around in there. "What a funny character, that gorilla was. I hope she at least had fun whilst wreaking havoc!" Ms. Livingston laughed to herself as she prepared to lift her couch back into place. Calculate the mass of her couch, if it took 380 J of energy (that she CLEARLY did not know she had) to lift it 0.50 m into the air.
Thank you, and goodnight.
77.5 kg
7456 kg
42
0.013 kg
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