Mechanics

Question 1

Why do both sides of a pulley have the same acceleration

Answer 1

light in extensible string = tension the same on both sides

Question 2

Mechanics is the study of what?

Answer 2

motion

Question 3

what are the modelling assumptions made when the string is light and inextensible?

Answer 3

• acceleration on both sides of the string is the same
• tension is equal throughout due to the string having no mass

Question 4

A car is is decelerating at a constant rate of 3.5 ms^-2 from A to B. When it reaches B, the car has travelled 210 metres over a period of 10 seconds.

Work out the initial velocity of the car.

Answer 4

Question 5

What is a particle and what are the modelling assumptions made for a particle?

Answer 5

• Dimensions of the object are negligible
• The weight acts from the centre of mass of each object, and ignores wind resistance and rotational forces
  aka all the weight acts from where the particle “stands”

Question 6

What is a particle and what are the modelling assumptions made for a particle?

Answer 6

Dimensions of the object are negligible

Question 7

What is a rod and what are the modelling assumptions made for a rod?

Answer 7

All dimensions but one are negligible ( like a pole)

Question 8

What is an inextensible string and what are the modelling assumptions made for an inextensible string?

Answer 8

A string that doesn’t stretch under a load

acceleration is the same in objects connected by a taut string

Question 9

What are the 5 suvat equations

Answer 9