Work and Energy

Work, Energy & Power Sec 3 Exp/NA

Specific Instructional Objectives ,[object Object],[object Object],[object Object],[object Object],[object Object]

Work ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Physics concept of WORK ,[object Object]

Physics concept of WORK ,[object Object],[object Object],[object Object]

Physics concept of WORK ,[object Object],[object Object],[object Object],[object Object]

Physics concept of WORK ,[object Object],[object Object],[object Object],[object Object],[object Object]

More Examples of WORK ,[object Object],Work done, W = F x s = 50 x 200 = 10,000 J or 10 kJ (kilo-Joules)

More Examples of WORK: ,[object Object],From Physics point of view, no work is done on pack at level ground. Reason: Lift is perpendicular to movement. Work is done on pack only when Jack climbs up the ladder. Work done, W = F x s = 120 x 10 = 1200 J or 1.2 kJ

Energy – Quick Re-cap ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Kinetic Energy (KE) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Kinetic Energy (KE) ,[object Object],[object Object],[object Object],[object Object]

Kinetic Energy (KE) ,[object Object],[object Object],Kinetic Energy = x Mass x (Velocity) 2 KE = x m x v 2 Units: [ J ] [kg] [ms -1 ] 2

Kinetic Energy (KE) ,[object Object],Mass = m kg Velocity, V

Examples of KE ,[object Object],[object Object],[object Object],KE of van at 2m/s = ½ x 1000 x (2) 2 = 2000 J = 2 kJ KE of van at 2m/s = ½ x 2000 x (2) 2 = 4000 J = 4 kJ KE of van at 2m/s = ½ x 1000 x (4) 2 = 8000 J = 8 kJ

Kinetic Energy (KE) ,[object Object],[object Object],[object Object],[object Object],KE doubles KE increases by FOUR times

Examples of KE ,[object Object],Velocity of motorcycle after 5s, a = (v-u) t v = 2(5) + 0 = 10m/s KE of motorcycle at 10m/s = ½ x 200 x (10) 2 = 10,000 J = 10 kJ

Potential Energy ,[object Object],[object Object],[object Object],[object Object]

Elastic PE ,[object Object],[object Object],[object Object],[object Object],[object Object]

Gravitational PE ,[object Object],[object Object],[object Object],[object Object]

Gravitational PE ,[object Object],[object Object],[object Object]

Gravitational PE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ground, 0 GPE Distance from ground, h Object on top of building, of mass, m g earth

Example of GPE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Examples of GPE ,[object Object],[object Object],GPE = mgh = 3  10  2 = 60 J ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object]

Specific Instructional Objectives ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],Conservation of Energy

Conservation of Energy ,[object Object],[object Object]

Conservation of Energy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conversion of Energy ,[object Object],[object Object],[object Object],[object Object],[object Object]

Conversion of Energy ,[object Object],[object Object],[object Object]

Free Falling object model ,[object Object],When the object is at the highest position , the GPE is at maximum and KE is zero . When the object is falling , the GPE decreases as it loses height, and the KE increases At the lowest position , the KE is at maximum and GPE is zero .

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Eg. of Conservation of Energy

Eg. of Conversion of Energy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Work and Energy

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