User kiss my armpit

5 votes

2 answers

11k views

Is there a normal force on an object submerged in water?

asked Nov 22, 2014 at 1:45

2 votes

1 answer

10k views

Where is the atmospheric pressure equal to zero?

asked Mar 6, 2014 at 18:01

9 votes

5 answers

9k views

Is it correct that tires quickly get bald when used at high speed?

asked Sep 8, 2013 at 16:18

18 votes

4 answers

8k views

How can we move an object with zero velocity?

asked Mar 11, 2014 at 15:54

9 votes

10 answers

6k views

Does the reaction force appear without delay?

asked Aug 25, 2013 at 5:20

6 votes

6 answers

5k views

Why isn't it allowed to use a flash when taking pictures in a certain place?

asked Jun 27, 2012 at 5:52

1 vote

1 answer

5k views

Finding friction forces of stacked boxes on a table

asked Apr 6, 2014 at 9:35

7 votes

3 answers

5k views

In the case of riding a bicycle, why can the system of the bicycle and rider be accelerated if no external net force?

asked May 21, 2014 at 19:42

1 vote

3 answers

3k views

What makes the Earth keep spinning?

asked Jun 22, 2012 at 3:30

0 votes

1 answer

2k views

When we are walking or running, which friction is exerted on our feet? Kinetic or static?

asked Nov 2, 2014 at 15:50

0 votes

1 answer

2k views

What is the net force acting on a climbing man by the rope?

asked Oct 6, 2014 at 19:45

5 votes

2 answers

2k views

Can a box on a frictionless rotating table rotate?

asked Oct 18, 2014 at 16:41

1 vote

3 answers

2k views

How to determine the direction of medium's displacement vectors of a standing wave?

asked May 4, 2013 at 0:30

2 votes

2 answers

2k views

Two runners on two different tracks

asked Sep 4, 2014 at 0:31

0 votes

2 answers

1k views

Is my free diagram of a spring stretched on one end and attached to the wall on the other end correct? [closed]

asked Jan 8, 2014 at 4:02

0 votes

1 answer

1k views

Are the the elongation the same when one end of a spring is attached to the wall and

asked Jan 8, 2014 at 17:23

5 votes

1 answer

1k views

Is it dangerous if one elementary particle with high energy penetrates our brain?

asked Jul 10, 2012 at 19:10

0 votes

3 answers

755 views

How to imagine the following power and torque?

asked Jul 9, 2012 at 19:08

1 vote

0 answers

749 views

How to determine the instantaneous acceleration of each box right after the connecting thread is cut? [closed]

asked Jan 17, 2014 at 13:34

7 votes

2 answers

514 views

Why don't we include $\rho g h$ in a hydraulic jack below?

asked Mar 11, 2014 at 14:28

0 votes

1 answer

504 views

Is there any net external force acting on the universe?

asked Jan 3, 2015 at 3:31

1 vote

0 answers

407 views

Why does a floating balloon in an accelerated train moves forward but the pendulum moves backward? [duplicate]

asked Jan 29, 2014 at 7:14

3 votes

2 answers

372 views

A theory about a travelling wave due to a vibrating rope seems to be contradictory, please spot what is wrong?

asked Jan 24, 2014 at 1:27

1 vote

2 answers

279 views

Can the relative position of two masses connected by a spring become negative?

asked Nov 30, 2014 at 19:42

1 vote

3 answers

277 views

Looking for the curve traced by a moving bicycle when its steering bar is fully rotated

asked Jul 30, 2012 at 19:03

3 votes

2 answers

208 views

Speed cannot be greater than speed of light. How about acceleration? Does it have limit?

asked Apr 6, 2014 at 4:29

4 votes

1 answer

192 views

How can we theoretically calculate the number of balloons needed to stop a bullet?

asked Jan 17, 2015 at 7:12

1 vote

0 answers

116 views

Warning: Gruesome. Which one cuts faster? Guillotine with a slanted blade or with a flat blade? [duplicate]

asked Sep 25, 2013 at 4:48

2 votes

2 answers

115 views

What prevents an orbiting object from getting a speed which is greater than $c$? [duplicate]

asked Apr 6, 2014 at 8:21

1 vote

1 answer

104 views

Which inertial observer should I choose when using $\Delta U = -\Delta K$?

asked Oct 20, 2014 at 19:29

Stack Exchange Network

30 Questions

Is there a normal force on an object submerged in water?

Where is the atmospheric pressure equal to zero?

Is it correct that tires quickly get bald when used at high speed?

How can we move an object with zero velocity?

Does the reaction force appear without delay?

Why isn't it allowed to use a flash when taking pictures in a certain place?

Finding friction forces of stacked boxes on a table

In the case of riding a bicycle, why can the system of the bicycle and rider be accelerated if no external net force?

What makes the Earth keep spinning?

When we are walking or running, which friction is exerted on our feet? Kinetic or static?

What is the net force acting on a climbing man by the rope?

Can a box on a frictionless rotating table rotate?

How to determine the direction of medium's displacement vectors of a standing wave?

Two runners on two different tracks

Is my free diagram of a spring stretched on one end and attached to the wall on the other end correct? [closed]

Are the the elongation the same when one end of a spring is attached to the wall and

Is it dangerous if one elementary particle with high energy penetrates our brain?

How to imagine the following power and torque?

How to determine the instantaneous acceleration of each box right after the connecting thread is cut? [closed]

Why don't we include $\rho g h$ in a hydraulic jack below?

Is there any net external force acting on the universe?

Why does a floating balloon in an accelerated train moves forward but the pendulum moves backward? [duplicate]

A theory about a travelling wave due to a vibrating rope seems to be contradictory, please spot what is wrong?

Can the relative position of two masses connected by a spring become negative?

Looking for the curve traced by a moving bicycle when its steering bar is fully rotated

Speed cannot be greater than speed of light. How about acceleration? Does it have limit?

How can we theoretically calculate the number of balloons needed to stop a bullet?

Warning: Gruesome. Which one cuts faster? Guillotine with a slanted blade or with a flat blade? [duplicate]

What prevents an orbiting object from getting a speed which is greater than $c$? [duplicate]

Which inertial observer should I choose when using $\Delta U = -\Delta K$?