Lab 7 Report

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Century College *

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1020

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Physics

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Apr 3, 2024

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Phys 1020 Physics Concepts I Names: Section: Date: Phys 1020 Lab Lab 7 Report Activity 1-1: Effort and Work – Calculating Work Prediction 1-1: Of the 3 examples of jobs on page 234, which would you choose for your crew? Explain why. (2 points) Job B: 5000 x ,8 = 4000 N x 30 M = 12,000 Job C: Would be the least work since it’s less weight and distance Question 1-1: In each case, lifting or pushing, why must you exert a force to move the object? (2 points) Because an object remains at rest until another force acts upon it Question 1-2: How much more effort does it take to lift or push two bricks or two 1-kg masses instead of one? (1 point) Twice the effort Question 1-3: How much more effort does it take to lift or push an object twice the distance? (1 point) Twice the effort Page 1 of 5

Phys 1020 Physics Concepts I Question 1-4: If work is defined as “effort,” how would you say work depends on the force applied and on the distance moved? (1 point) W=F x D Question 1-5: Does this definition of work agree with the amount of effort you hade to expend when you moved bricks or 1-kg mass under different conditions? Explain (1 point) Yes, since it is double the weight or distance, you need to put into twice the effort to make it lift Question 1-6: Does effort necessarily result in physical work? Suppose two people are in an evenly matched tug of war. They are obviously expending effort to pull on the rope, but according to the definition are they doing any physical work as defined above? Explain (2 points) No because they aren’t moving so no distance is created, therefore, they are just putting in effort Activity 1-2: Calculating Work When the Force and Displacement Lie Along the Same Line and When They Don’t Print your graphs: (1 point each) Page 2 of 5

Phys 1020 Physics Concepts I Prediction 1-2: Suppose the force is not exerted along the line of motion but is in some other direction. If you try to pull the cart up along the same ramp in the same way as before (again with a constant velocity), only this time with a force that is not parallel to the surface of the ramp, will the force probe measure the same force, a larger force, or a smaller force? (1 point) You would have to put in more effort to pull it causing a bigger force. 8. Average force pulling parallel to surface: N (1 point) Average force pulling at 60 o angle to the surface: N (1 point) Question 1-7: Was the average force measured by the force probe different when the cart was pulled at 60 o to the surface than when the cart was pulled parallel to the surface? Did the result agree with your prediction? (1 point) Yes, this agreed with my prediction Question 1-8: Did it seem to take more effort to move the cart when the force was inclined at an angle to the ramp’s surface? Do you think that more physical work was done to move the cart over the same distance at the same slow constant speed? (2 points) It did seem to make more effort because more physical work was done to move it. Question 1-10: Based on your observations in this investigation, was your choice in Prediction 1-1 the best one? In other words, did you pick the job requiring the least physical work? Explain why. (2 points) No, because it will require more force to fully lift the object off of the ground to cover the distance and less work to just pull it at an angle but further Page 3 of 5 .93N 1.31

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Phys 1020 Physics Concepts I Activity 2-1: Work Done by a Constant Lifting Force Print your graphs (1 point) Question 2-1: Did the force needed to move the mass depend on how high it was off the floor, or was it reasonably constant? (1 point) Reasonably constant Print your graphs (1 point) Page 4 of 5

Phys 1020 Physics Concepts I 7. Average force: N Distance lifted: m (2 points) 8. Work done: J (1 point) Question 2-2: Do the two calculations of the work seem to agree with each other? Explain. (1 point) Yes because they get the same answer and are consistent with the other records we have. Page 5 of 5 4.7 1 4.7

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