random facts that i dont know what topic they belong in but defo topic 1A

Question 1

what is a free body diagram

Answer 1

a diagram that simplifies the object to a point and illustrates all the forces on the object and the direction they act it

Question 2

what do all free body diagrams have in common

Answer 2

1. they all show vectors coming from one point. 2. all normally involve weight. 3. all normally have more than one force

Question 3

resultant force =

Answer 3

big force - a small force

Question 4

how to draw scale diagrams

Answer 4

1. Sketch a simple force diagram.
2. Find the resultant forces horizontally and vertically.
   Draw a scale diagram with the vectors following each other. (this makes sure the resultant force is in the correct direction) (Use 1cm to 1N if possible)
   Draw the total resultant force and measure its length with a ruler.
   Measure the angle from the horizontal with a protractor.

Question 5

if we try to translate a velocity-time graph to displacement-time graphs what happens

Answer 5

the lines in the displacement time graph are curved

Question 6

if we have constant speed what happens to the acceleration

Answer 6

it would stay constant at zero because if it was more than zero then the velocity would be changing the speed

Question 7

what is a uniform plank

Answer 7

A uniform plank would be held in horizontal equilibrium by a pivot at the mid-point. It follows that a non-uniform rod would not be in equilibrium by a pivot at the mid-point.

Question 8

what does tension =

Answer 8

downward force = 2 t sin angle

Question 9

how do you find the cross-sectional area of a spring

Answer 9

pi x d^2 /4