Work done by gravity on a car rolling down a hill

AI Thread Summary
The discussion centers on calculating work done by gravity on a car rolling down a hill, with a focus on the formula E = F x cos(θ). A participant mentions obtaining 243 kJ but questions the values used for force (F), distance (x), and angle (θ). The conversation suggests that using the work-energy principle, W = ΔE_P, is more appropriate for this scenario than the traditional formula. Additionally, there is a query about the specific distance represented by 50 cos(8°) m in the context of the problem. The thread emphasizes the importance of correctly applying the relevant formulas to accurately determine the work done by gravity.
physicsmaster123
Messages
3
Reaction score
0
Thread moved from the technical forums to the schoolwork forums
I tried E =Fxcos0 but only ended up with 243kJ
1694284850662.png
 
Last edited by a moderator:
Physics news on Phys.org
What values of ##F##, ##x##, and ##\theta## did you use and why?
 
Hint: What is the textbook definition of ##\theta## in the formula you stated?
 
Last edited:
physicsmaster123 said:
I tried E =Fxcos0 but only ended up with 243kJ
What distance in the diagram is ##50\cos(8°)##m?
 
Specific to this exercise, ##W=\Delta E_P## is a better fit than ##W=Fd\cos \theta##
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Correct statement about a reservoir with an outlet pipe'

Thread 'Correct statement about a reservoir with an outlet pipe'

The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
View full post »

Similar threads

Combined Rotation and Translation of a Rectangular Plate
Replies
9
Views
2K
A block dropping onto a spring system
2
Replies
58
Views
2K
Kinetic Energy of a Cylinder Rolling Without Slipping
Replies
21
Views
4K
Final velocity of a car rolling down a ramp using energy
Replies
1
Views
3K
Why Does a Car Accelerate When Rolling Down a Hill?
Replies
11
Views
3K
Forces involved in principle of virtual work
Replies
2
Views
752
Why is the direction of kinetic/static friction up a ramp?
Replies
7
Views
1K
A cylinder of snow rolls down a hill gathering more snow -- calculate its speed
Replies
39
Views
3K
Work & Energy (Question on Classical Mechanics/Slope based Problems)
Replies
7
Views
2K
Thermodynamic Work vs Mechanical Work
Replies
3
Views
950

Hot Threads

Recent Insights

Back
Top