Describe how you know that work was done in this GIF.
4 points
4
Question 2
2.
A force of 30 N acts on the block at the angle shown. The block moves a horizontal distance of 37 cm. How much work is done by the applied force? (Show your work for feedback!)
6 points
6
Question 3
3.
What is the 'theta angle' AND how do you know?
4 points
4
Question 4
4.
Calculate the work done by a 22-N force (directed at a 40° angle to the vertical) to move a 5-kilogram box a horizontal distance of 500 cm across a rough floor at a constant speed of 0.7 m/s. (LOST? Confused?: Go back to the slideshow, and read the very last slide and the speaker notes at the bottom.) (Make sure you show your work for feedback!)
6 points
6
Question 5
5.
In your own words, describe what potential energy is. (Be ready to defend your answer.)
2 points
2
Question 6
6.
If you double the height above the zero position, then you __________ the PEgrav.
4 points
4
Question 7
7.
There is a ball that is 30m above the zero line that has a mass of 55kg. The ball current PEgrav = _______
2 points
2
Question 8
8.
If you double the amount of compression of a spring relative to its equilibrium position, then you __________ the PEspring.
8 points
8
Question 9
9.
"An object possesses elastic potential energy if it is at a position on an elastic medium other than the equilibrium position."
Interpret this sentence and give 2 real-life examples of its meaning.
4 points
4
Question 10
10.
When you quadruple the speed of the object, you __________ its KE by a factor of __________.
When you reduce the speed of the object by a factor of 3, you __________ its KE by a factor of __________.
8 points
8
Question 11
11.
Write a statement that best summarizes the relationship between the initial release height and the speed at the bottom of the hill in the lab activity.
4 points
4
Question 12
12.
Determine the kinetic energy of a 740-kg roller coaster car that is moving with a speed of 19.1 m/s.
4 points
4
Question 13
13.
Olver Weightver, the former platform diver for Harrison, had a kinetic energy of 21,000 J just prior to hitting the Pool. If Olver's mass is 140 kg, then what is his speed?
6 points
6
Question 14
14.
Give one example of mechanical energy, and then justify why your example definitly has mechanical energy.
6 points
6
Question 15
15.
KE to PE or PE to KE? How do you know?
4 points
4
Question 16
16.
A shopping cart full of groceries is sitting at the top of a 3.0-m hill. The cart begins to roll until it hits a stump at the bottom of the hill. Upon impact, a 0.5-kg can of peaches flies horizontally out of the shopping cart and hits a parked car with an average force of 100 N. How deep a dent is made in the car (i.e., over what distance does the 100 N force act upon the can of peaches before bringing it to a stop)?
4 points
4
Question 17
17.
A 1200-kg car traveling with a speed of 25 m/s skids to a stop. The car experiences a 1000 N force of friction. Determine the stopping distance of the car.