# GCSE AQA Physics 3 Forces

Mind Map by Lilac Potato, updated more than 1 year ago More Less
 Created by Lilac Potato almost 4 years ago
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### Description

Mind map showing information about moments and levers, stability, pendulums, hydraulics and circular motion.

## Resource summary

GCSE AQA Physics 3 Forces
1 Moments
1.1 Moment = Force x Distance from line of action of force to pivot
1.2 Larger force = larger moment
1.3 Same force can exert larger moment if distance from pivot is greater
1.3.1 To get max. moment - need to push at right angle
1.4 Total clockwise moments = Total anticlockwise moments
1.4.1 Levers use balanced moments
1.4.1.1 Increase distance from pivot at which force is applied
1.4.1.1.1 Less force is needed to get same moment
1.4.1.1.1.1 Levers are force multipliers
1.4.1.1.1.1.1 Make it easier to do work
2 Centre of Mass
2.1 Point at which whole mass is concentrated
2.2 Freely suspended object will swing until its centre of mass is vertically below the point of suspension
2.3 Finding the COM of a flat shape:
2.3.1 Suspend shape & plumb line from same point - stop moving
2.3.1.1 Draw line along plumb line
2.3.1.1.1 Repeat with shape suspended from different pivot point
2.3.1.1.1.1 COM is where 2 lines cross
2.4 With symmetrical shape - can find it using lines of symmetry
3 Stability
3.1 If moments aren't equal - will be resultant force
3.2 Most stable objects have wide base & low centre of mass
3.3 Object will tip over if the line of action of the weight of the object lies outside of the base of the object - causes a resultant moment
4 Pendulum
4.1 Time taken to swing from one side to other & back - time period
4.1.1 Always the same for each swing of given pendulum
4.1.2 Time Period = 1 / Frequency
4.1.2.1 Longer pendulum - greater time period
5 Hydraulics
5.1 Liquids are virtually incompressible & can flow
5.1.1 Force applied to one point in liquid transmitted to other points in liquid
5.1.1.1 Pressure in a liquid is transmitted equally in all directions
5.1.1.1.1 Pressure = Force / Cross-sectional area
5.2 Hydraulic systems - force multipliers
5.2.1 2 pistons - 1 with smaller cross-sectional area
5.2.1.1 Pressure at both pistons is same
5.2.1.1.1 At 1st piston - pressure exerted using small force over small area
5.2.1.1.1.1 Pressure transmitted to 2nd piston - has larger SA so there is larger force
5.2.2 Used in car braking systems & car jacks
6 Circular Motion
6.1 Velocity is speed & direction - object travelling in circle is constantly changing direction
6.1.1 Velocity is constantly changing (not speed) so is accelerating towards centre of circle
6.1.1.1 Must be resultant force causing acceleration - acts towards centre
6.1.1.1.1 Centripetal force
6.1.1.1.1.1 Faster moving object = bigger CF
6.1.1.1.1.2 Larger mass = bigger CF
6.1.1.1.1.3 Smaller radius = bigger CF

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