A N force at above the horizontal pulls a sledge m along level ground. Calculate the work done by the force.
Salam Academy Original Practice · Proposed mark scheme
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12 questions
A motor takes W of electrical power and produces W of useful mechanical power. Calculate its efficiency.
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The work done by a varying force is equal to
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Power is defined as
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A motor is efficient. It is supplied with J of energy. Calculate the useful energy output.
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One watt is equal to
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A car travels at a constant m s⁻¹ against total resistive forces of N. Calculate the useful power output of the engine, in kW.
Salam Academy Original Practice · Proposed mark scheme
An kg person climbs m of stairs in s. Calculate the useful power developed. ( m s⁻²)
Salam Academy Original Practice · Proposed mark scheme
A gas expands by m³ against a constant external pressure of Pa. Calculate the work done by the gas.
Salam Academy Original Practice · Proposed mark scheme
A kW motor lifts a kg load through m. Assuming it is efficient, calculate the time taken. ( m s⁻²)
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A force increases uniformly from to N while its point of application moves m in the direction of the force. Calculate the work done.
Salam Academy Original Practice · Proposed mark scheme
A kg car climbs a slope inclined at to the horizontal at a constant m s⁻¹. Resistive forces total N. Calculate the useful output power of the engine, in kW. ( m s⁻²)
Salam Academy Original Practice · Proposed mark scheme