Power
Physics ⇒ Mechanics
Power starts at 8 and continues till grade 12.
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See sample questions for grade 11
A car engine provides a constant power output. If the car's speed doubles, what happens to the force provided by the engine?
Describe a real-life example where high power is required but not necessarily a large amount of work.
Explain the difference between average power and instantaneous power.
If the velocity of an object is zero, what is the instantaneous power delivered by a force acting on it?
A 60 W light bulb is left on for 10 hours. How much energy does it consume in joules?
A car engine provides a constant power output. If the car's speed doubles, what happens to the force provided by the engine?
A crane lifts a 500 kg load at a constant speed to a height of 10 m in 20 seconds. What is the power output of the crane? (g = 9.8 m/s²)
A cyclist does 9000 J of work in 10 minutes. What is the average power output?
Which of the following best describes instantaneous power?
(1) Total work done divided by total time
(2) The power at a specific instant of time
(3) The average power over a period
(4) The maximum power possible
Which of the following is equivalent to 1 horsepower?
(1) 746 W
(2) 1000 W
(3) 550 W
(4) 1 kW
Which of the following is NOT a unit of power?
(1) Watt
(2) Joule/second
(3) Newton-meter/second
(4) Joule
Which of the following is the correct relationship?
(1) Power = Work × Time
(2) Power = Work / Time
(3) Power = Force / Distance
(4) Power = Mass × Acceleration
Instantaneous power is defined as the ______ of work with respect to time.
Power can be expressed as the product of force and ______ when the force and velocity are in the same direction.
Power is defined as the rate at which ______ is done.
The formula for average power is ______ divided by time.
True or False: If a machine does the same amount of work in less time, it has more power.
True or False: Power can be negative if the force and velocity are in opposite directions.
True or False: The power delivered by a force is maximum when the force and velocity are perpendicular.
True or False: The unit 'horsepower' is commonly used to measure the power of engines.
