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WorksheetsTOPIC 7_POWER
Total questions: 30
Worksheet time: 19mins
Layla pulled a box up a smooth ramp from A to B with a force of 30 N over a distance of 2 m in 5 s. What is the power used by Layla to pulled a box up?
12.00 W
24.00 W
300 W
12 W
What is power?
Ability to do work
Rate of doing work
Rate of doing force
Ability to do force
What is the formula for power?
Power = Work done/time taken
Power = Force/time taken
Power = Energy transferred/time taken
Power = Time/Work done
What is the standard unit (SI) for POWER?
Watts
Joules
Newtons
Horseriding
If you do the same work as someone, but you took shorter time to complete the work, it means:
You are more powerful
You are less powerful
You have the same power
If you increase your work and decrease your time, you will have
more power
less power
same amount of power
power rating can not be determined
How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?
3920.00 W
980.00 W
400.00 W
100.00 W
Which requires more power – a person walking up stairs or a person running up stairs?
walking
running
they require equal power output
no power is required at all
What is the equation used for calculating power from force and velocity
Power = force/velocity
Power = force * velocity
Power = force + velocity
Power = velocity / force
Which of the following is the correct equivalent of watts unit?
joule per second
meter per second
watts per second
watts.seconds
Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?
100.00 watts
400.00 watts
104.00 watts
50.00 watts
Which of the following is not true about power?
power is the rate at which energy is transferred
power is the rate at which work is done
power has a startdard unit of Watts which is equivalent to J/s
power is taken from the scientists' name, james prescott watts who used a horse to estimate its value
Which is the follwing unit equivalents is not correct?
1 J/s = 1 watt
1 kW = 1000 watts
1 hp = 746 watts
1 W.s = 1 Joule
1 watt = 1 kg.m2/s2
What is the standard unit of power?
watts
kg.m2/s3
J/s
horsepower
Which of the following are true about James Watt?
He is both a mathematician and an engineer.
He greatly improved the generator developed in 1712.
He used a horse to estimate the value of power.
He developed the law of thermodynamics
Which of the following pairs is not correct?
Power = Watts
Energy = Joules
Work = J/s
Force = Newton
Which of the following pairs is correct?
Newton = kg.m/s2
Joules = kg.m/s3
Watts = kg.m2/s2
Kilowatt = kg.m2/s3
If two devices do the same amount of work, but one does it in half the time, how do their powers compare?
The one taking more time has higher power
The one taking less time has higher power
Both have equal power
It depends on the mass of the objects involved
In terms of power, what does it mean when an engine is more efficient?
It consumes more fuel
It produces more heat
It converts more energy into useful work
It works at a slower rate
How does the power output of a machine change if the amount of work done remains constant but the time taken is reduced?
Power increases
Power decreases
Power remains the same
Power becomes zero
Which formula represents the relationship between power, force, and velocity?
Power = Force × Velocity
Power = Force ÷ Velocity
Power = Force + Velocity
Power = Velocity ÷ Force
What happens to the power output of a machine if both the force applied and the velocity increase?
Power increases
Power decreases
Power remains the same
It depends on the direction of the force
How is power related to energy and time?
Power = Energy × Time
Power = Energy ÷ Time
Power = Time ÷ Energy
Power = Energy + Time
How can we save electrical energy consumption at home?
use electrical devices in a shorter amount of time
choose a brand of electrical devise that has lesser wattage
use electrical devices in a longer amount of time
choose a brand of electrical devise that has greater wattage
Which of the following statements correctly describes the relationship among work, energy, and power?
a) Work is the transfer of energy.
b) Energy is the capacity to do work.
c) Power is the rate at which work is done or energy is transferred.
a) Work is the transfer of power.
b) Energy is the capacity to do work.
c) Power is the rate at which work is done or energy is transferred.
a) Work is the capacity to do work.
b) Energy is the transfer of work.
c) Power is the rate at which work is done or energy is transferred.
a) Work is the transfer of energy.
b) Energy is the capacity to do work.
c) Power is the rate at which work is done or energy is consumed.
Which of the following equivalents is correct?
Force (F) = Newton (N) = kg.m/s2 = Isaac Newton
Energy (E) = Joules (J) = kg.m2/s2 = James Prescott Joule
Work (W) = Joules (J) = kg.m2/s2 = James Prescott Joule
Power (P) = Watts (W) = J/s = kg.m2/s3 = James Watt
Which of the following is a unit for power?
watts
kilowatt
J/s
horsepower
If two devices perform the same amount of work, but the 2nd device does it in half the time, which device has the greater power?
The first device
The second device
Both devices have the same power
It cannot be determined from the information given
Which of the following quantities are directly proportional to power?
Force
distance
mass
velocity
time
