Physics yr 8

Question 1

pivot/fulcum

Answer 1

a fixed point around which something turns

Question 2

moment

Answer 2

the turning effect of a force

measured in Newton mentres (Nm)

Moment = Force (N) x Distance (m)

Question 3

The Principle of Moments

Answer 3

For an object to be in equilibrium, the clockwise and anti-clockwise moments are equal.

Question 4

equilibrium

Answer 4

when an object is balanced

Question 5

pressure

Answer 5

the amount of force per unit area of an object

measured in Newtons per square metre also called** pascals (Pa)**

pressure = force / area

Question 6

fluid

Answer 6

a substance that flows

this means that it continually changes shape when force is applied to it

Question 7

If you put two bowl like objects together and make the space within them a vacuum, are the sides of the bowls (hemisoheres) sucked inwards?

Answer 7

There is no such thing as the force of suction

Question 8

Does atmospheric pressure increase or decrease with altitude?

Answer 8

At altitude there are fewer particles per cubic cemtimetre which means fewer collisions and less pressure

Question 9

density

Answer 9

the amount of matter per unit of volume of an object or substance

Question 10

density formula

Answer 10

Density = Mass / Volume

see density formula triangle in physics book

Question 11

Density Units

Answer 11

kg(m3) / g (cm3)

Question 12

compress

Answer 12

flatten by pressure; squeeze or press.

Question 13

effort

Answer 13

a force exerted in a process

Question 14

load

Answer 14

the force exerted on a surface or body