EQUATIONS OF CONSTANT ACCELERATION



ISLAMIYA ENGLISH SCHOOL

PHYSICS WORKSHEET

Work, Gravitational potential energy, Kinetic energy & Power calculations.

|Word equations. |

|work done = force x distance moved in the direction of the force |

|weight = mass x gravitational field strength |

|gravitational potential energy = mass x gravitational field strength x height |

|kinetic energy = 1/2 x mass x (speed)2 |

|power = energy change ÷ time taken |

|power = work done ÷ time taken |

| |Work done. | |

|1 |Calculate the work done when a force of 4N moves by 3m. | |

|2 |Calculate the work done when a force of 4kN moves by 8mm. | |

|3 |Calculate the force needed to do 400J of work over 10m. | |

|4 |Calculate the force needed to do 4000J of work over 80cm. | |

|5 |Calculate the distance moved by a force of 30N when doing 690J of work. | |

|6 |Calculate the distance moved by a force of 2kN when doing 200kJ of work. | |

|7 |Calculate the distance moved by a force of 60N when doing 3MJ of work. | |

|8 |Calculate the work done when a mass of 400kg is lifted up by 30cm. | |

|9 |What weight requires 400J of work to lift it by 10m? | |

|10 |What mass requires 80kJ of work to lift it by 40mm? | |

| |Gravitational potential energy. | |

|11 |Calculate the g.p.e. gained by a child of mass 30kg when it climbs up stairs of height 2m. | |

|12 |Calculate the g.p.e. gained by a car of mass 800kg when it climbs up a hill of height 40m. | |

|13 |Calculate the mass of a car if it gains 50 000J of g.p.e. when it climbs up a hill of height 25m. | |

|14 |Calculate the mass of a fly if it gains 0.2J of g.p.e. when it climbs up by 20m. | |

|15 |Calculate the height gained by a girl, of mass 60kg, if she gains 1800J of g.p.e. | |

|16 |Calculate the height gained by a bird, of mass 1.5kg, if it gains 300J of g.p.e. | |

|17 |Calculate the g.p.e. gained by a bird of mass 500g when it climbs up by 500m. | |

|18 |Calculate the g.p.e. gained by a fly of mass 2g when it climbs up by 50cm. | |

|19 |Calculate the weight of a car if it gains 60 kJ of g.p.e. when it climbs up a hill of height 50m. | |

|20 |Calculate the mass of a fly if it gains 4mJ of g.p.e. when it climbs up by 40cm. | |

| |Kinetic energy. | |

|21 |Calculate the kinetic energy of a car of mass 800kg moving at a speed of 10m/s. | |

|22 |Calculate the kinetic energy of a coin of mass 20g moving at a speed of 4m/s. | |

|23 |Calculate the kinetic energy of a feather of mass 500mg moving at a speed of 1m/s. | |

|24 |Calculate the mass of a car that has a kinetic energy of 17 000J when moving at 6m/s. | |

|25 |Calculate the mass of a child who has a kinetic energy of 40J when moving at 2m/s. | |

|26 |Calculate the mass of a missile with kinetic energy of 10 000 000J when moving at 200m/s. | |

|27 |Calculate the speed of a car of mass 1000kg that has 500J of kinetic energy. | |

|28 |Calculate the speed of a car of mass 800kg that has 6 400J of kinetic energy. | |

|29 |Calculate the kinetic energy of an orange of mass 150g moving at a speed of 6m/s. | |

|30 |Calculate the mass of a car that has a kinetic energy of 50 000J when moving at 10m/s. | |

| |Power. | |

|31 |Calculate the power of a motor that uses 800J of electrical energy in 20 seconds. | |

|32 |Calculate the power of a girl who performs 3000J of work in 6 seconds. | |

|33 |Calculate the power of a car that uses 120kJ of chemical energy in 5 seconds | |

|34 |Calculate the power of a train that uses 4MJ of electrical energy in 8 seconds | |

|35 |Calculate the energy used by an iron of power 700W in 20 seconds. | |

|36 |Calculate the work done by a marathon runner of power 200W in 3 hours. | |

|37 |Calculate the energy used by a light bulb of power 40W in 2 minutes. | |

|38 |Calculate the work done by a generator of power 3MW in 7 days. | |

|39 |How long does it take a television of power 300W to use 120kJ of energy? | |

|40 |How long does it take an electric fire of power 3kW to produce 6MJ of energy? | |

| |Extra practice questions. | | | | |

|42 |Calculate the g.p.e. gained by a fly of weight 0.05N when it | |47 |What mass requires 3kJ of work to lift it by 3mm? | |

| |climbs up 200mm. | | | | |

|43 |Calculate the power of a bell that uses 360kJ of electrical | |48 |Calculate the kinetic energy of a ball of mass 50g moving at a | |

| |energy in 200 hours | | |speed of 15m/s. | |

|44 |Calculate the distance moved by a force of 5MN when doing | |49 |Calculate the speed of an orange of mass 300g that has 3J of | |

| |200kJ of work. | | |kinetic energy. | |

|45 |Calculate the height gained by a girl, of mass 50kg, if she | |50 |Calculate the g.p.e. gained by a child of mass 25kg when it | |

| |gains 2500J of g.p.e. | | |climbs up a 3m staircase | |

51. (a) A technician uses a hammer to force a nail into a wooden beam.

The hammer has a mass of 0.40 kg. It has a speed of 5.0 m/s just before it hits the nail.

[pic]

Calculate the kinetic energy of the hammer just before it hits the nail and give its unit.

(b) The technician raises the hammer to a height of 0.75 m above the beam before bringing it down to hit the nail.

Calculate the increased gravitational potential energy of the hammer at a height of 0.75 m above the

beam.

(c) (i) After raising the hammer to a height of 0.75 m, how much work does the technician do in hitting

the nail with the hammer? Give its unit.

(ii) Explain your answer.

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For the following questions assume that the gravitational field strength g = 10 N/kg

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