All Questions
70
questions
2
votes
4
answers
167
views
Does it take more energy to bring a car to a halt if it is still accelerating on impact than travelling at constant speed?
So, my physics is quite rusty, been out of varsity for a while.
A friend asked me this and I am still pondering. Here is the scenario:
2 Cars are travelling towards a wall, and make impact with the ...
- 29
4
votes
4
answers
398
views
How do I convince my students the Newton's first Law is the way it is?
Every time I teach this law, there are always a few students asking me why a net force is zero on a system moving at a constant velocity. This group of students takes physics for the 1st time. It is ...
- 59
0
votes
1
answer
393
views
Is the jerk caused by pseudo force when bus come to stop suddenly?
If a bus stops moving suddenly, we tend to fall forwards due to the inertia of motion of our upper body.
But can we explain the sudden jerk in the forward direction due to some pseudo force? (Because ...
0
votes
7
answers
848
views
Why does "net force" being zero not mean that the parachuter becomes stationary in the atmosphere?
Take the typical phyiscs / classical mechanics example of a parachuter descending at constant speed. The two forces acting on the parachuter are weight, which has direction towards the ground, and air ...
- 899
1
vote
6
answers
598
views
What happens to the acceleration from an initial force according to the law of inertia?
Say we hit a golf ball with a club. Hitting the ball requires a force = m*a. According to the law of inertia, velocity should be constant, but how can that velocity be constant if we hit the golf ball ...
- 45
-2
votes
2
answers
1k
views
Why is a larger force needed when you decrease the distance in regards of torque? [closed]
I think it's because of inertia.
- 107
-2
votes
2
answers
95
views
Proof behind inertia increases with mass?
My book starts off by giving an example that if we kick a football it flies away but if we kick a stone of the same size with equal force then it stays at rest. It says that from this series of events ...
- 252
0
votes
2
answers
553
views
An elevator moving with constant velocity
While an elevator moves up, it moves up with a constant velocity. I read this post and understood that it's because of inertia. However, I'm not really convinced.
So what happens which I have ...
- 1,168
2
votes
3
answers
334
views
Is pseudo force another form of inertia observed from accelerating frame of reference?
We know that pseudo forces act when we opt for non-inertial frames of reference.
Is pseudo force another form of inertia observed from accelerating frame of reference?
0
votes
4
answers
112
views
Newton first law of motion
The State of rest and the state of uniform linear motion are equivalent. Why?
0
votes
1
answer
54
views
Do objects need some time to know that the forces exerted on them are gone?
Okay, so I know how to solve this question, but I don't quite understand the concept behind it!
The solution simply states that the acceleration of m2 after the rope is cut will equal the force of ...
- 23
23
votes
9
answers
6k
views
Why does mass limit acceleration?
If a force of $10\,\mathrm{N}$ is applied to different objects of different mass in empty space, in the absence of gravity, why do lighter objects accelerate faster than heavier objects? Why does mass ...
- 817
1
vote
4
answers
476
views
Conceptual difficulty with friction and inertia
Consider this -
A box lies on the floor of a bus which starts accelerating. Two cases arise
$1.$ If the static friction is great enough, the box accelerates with the bus with acceleration equal to ...
- 428
3
votes
2
answers
217
views
String, rod and inertia [closed]
I was recently reading through some posts on this site. A question struck me -
Why does an object attached to the end of a string which is further attached to an accelerating car behave differently ...
user290607
-1
votes
6
answers
261
views
Newton's $1$st law question
A long time since I posted it, still did not get a satisfactory solution. So I restate the problem -
Why does not an object attached to a string which is attached to the roof of an accelerating bus ...
- 428