Physics Forces And Motion

Question 1

Speed calculation

Answer 1

Speed=distance/time. The symbol for speed is v

Question 2

Distance calculation

Answer 2

Distance=timexspeed. The sumbol for distance is s

Question 3

Time calculation

Answer 3

Time=distance/speed. The symbol for time is t

Question 4

Pressure calculation

Answer 4

Pressure=Force/area. The symbol for pressure is P

Question 5

Force calculation

Answer 5

Force=areaxpressure. The symbol for force is F

Question 6

Area calculation

Answer 6

Area=Force/Pressure. The symbol for area is A

Question 7

Gas pressure

Answer 7

Equal on all sides

Question 8

Why does gas exert a pressure?

Answer 8

Gas molecules move - high speeds, collide exert force, lots - gas molecules colide with surface area causes pressue

Question 9

Atmouspheric pressure varies with the height

Answer 9

Closer - earth surface greater - air pressure
Higher less gas molecules exerting pressure, causes tempurature - decrease, less gas molecules + moving slower, also means less molecules exerting force = decrease - atmouspheric pressure

Question 10

Pressure in a liquid

Answer 10

Pressure - liquid acts all directions + increases with depth - more water wighing doen on it

Question 11

Hydraulics pressure

Answer 11

Hydraulic systems use - principle pressure - transmitted throughout liquid.
They - used transfer movement from one part of machine - another without linking parts mechanically.
All hydraulic systems use two pistons (1 master piston and other slave pistons) linked via pipe which carries special oil called hydraulic fluid.
Pressure that leaves the system is the same as the pressure that entered

Question 12

Instantaneous speed

Answer 12

How fast you are going at a certain point

Question 13

Average speed

Answer 13

General speed whole journey with fast and slow periods taken into acount

Question 14

Relative motion

Answer 14

How fast one thing is travelling compared to another

Question 15

Pressure

Answer 15

When weight is on a surface it exerts a force on an object, smaller the objects surface area the stronger the pressure

Question 16

Pivot

Answer 16

the point around which the object can rotate or turn.

Question 17

Moment

Answer 17

Turning effect of a force depends on force applied and how far from the pivot it is

Question 18

Law of moments

Answer 18

Object in equilibrium - sum of clockwise moments = sum of anticlockwise moments

Question 19

Centre of gravity(centre of mass)

Answer 19

Centre gravit above pivot no turning force but if centre of gravity left/right of pivot there is a turning force

Question 20

Perpendicular distance from the pivot(m) calculation

Answer 20

Perpendicular distance from the pivot(m)=Moments(Nm)/Force(N)

Question 21

Force(N) calculation

Answer 21

Force(N)=Moments(Nm)/perpendicular distance from the pivot(m)

Question 22

Moments (Nm) calculation

Answer 22

Moments(Nm)=Force(N)xperpendicular distance from the pivot (m)

Question 23

Fluid

Answer 23

Something with no fixed shape

Question 24

Cause of atmouspheric pressure

Answer 24

Wheight of air above a surface