SHM help? Watch

ella sian
Badges: 11
Rep:
?
#1
Report Thread starter 1 month ago
#1
The question is: There are two forces acting on the pendulum bob shown in fig 4 explain how these forces are responsible for the resultant force F on the pendulum bob

I know the two forces are tension and weight, but I dont understand how weight can provide the centripetal force since its at a right angle to the motion? why isnt the only force tension

the answers says:
There is upward force on the bob due to the tension in the string and a
vertically downward weight of the bob.
These two forces add together to produce a resultant force to that is
horizontal and to the left as shown in

idk does shm include weight?
0
reply
username3442196
Badges: 8
Rep:
?
#2
Report 4 weeks ago
#2
The markscheme is correct.
There's no circular motion and no centripetal force.
Pendulum SHM is never actually straightforward, but we pretend the resultant force is proportional to distance from equil position and directed towards equil position, which is what is required for shm.
1
reply
ella sian
Badges: 11
Rep:
?
#3
Report Thread starter 4 weeks ago
#3
thank you but how does the weight do to produce force f?
(Original post by old_teach)
The markscheme is correct.
There's no circular motion and no centripetal force.
Pendulum SHM is never actually straightforward, but we pretend the resultant force is proportional to distance from equil position and directed towards equil position, which is what is required for shm.
0
reply
username3442196
Badges: 8
Rep:
?
#4
Report 4 weeks ago
#4
If you draw a vector triangle, the resultant of the weight and the tension should be back towards the equil position.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • SOAS University of London
    Postgraduate Open Day Postgraduate
    Wed, 29 May '19
  • University of Exeter
    Undergraduate Open Day - Penryn Campus Undergraduate
    Thu, 30 May '19
  • Cranfield University
    Cranfield Forensic MSc Programme Open Day Postgraduate
    Fri, 31 May '19

How did your AQA A-level Business Paper 1 go?

Loved the paper - Feeling positive (179)
22.83%
The paper was reasonable (366)
46.68%
Not feeling great about that exam... (146)
18.62%
It was TERRIBLE (93)
11.86%

Watched Threads

View All