SP9

Question 1

what is contact force

Answer 1

the forces between objects that are touching;

such as when u stand on the floor, there is an upwards force from the floor cslled normal contact force

Question 2

narrowboat is flloatijg, describe ghe forces acting on it

Answer 2

boat is floating due to anotjer contact force cslled upthrust, upthrust is balanced by a non contact force called gravity. it does not need to touch the bost to gi d it weight, both upthrust and the weight are acting om the same objsct

Question 3

qhat is an action reaction forces

Answer 3

pairs of forces acting on different objects in opposite directions

Question 4

what is the resultant force

Answer 4

the sum of all forces acting on an object

Question 5

how to do vector diagrams

Answer 5

bro im lazy do it from tb and nb learn it

Question 6

what is a lever

Answer 6

a rigid bar that moves about the pivot,
when tou push down on one side the object on the otjer goes up
levers are usef to magnify the force and make objects easier to move forces

Question 7

what is a pivot

Answer 7

the fixed position in an object can turn

Question 8

describe moment

Answer 8

the measure of the turning effect of a force
calced vy

moment= force x perpendicular distance from s pivot

M= f x d

moment unit is Nm, Newton metre

Question 9

david uses a spanner to try to turn a bolt, he pushes the spanner with a force of 50N of a distance of 0.3m from the povot as shown in the diagram

cal momsnt

Answer 9

0.3x50 = 25Nm

Question 10

two ways of increasing size of moment

Answer 10

increSe size of force
increase distance from pivot

Question 11

what is the principle of momsnt

Answer 11

at equilibrium the total clockwise moment about a point equals the total anticlockwise mment about the same point