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Chapter 5 - Physics

Work/Power

QuestionAnswer
In which of the following sentences is work used in the scientific sense of the word? Sam and Rachel pushed hard, but they could not do work on the car.
In which of the following sentences is work used in and everyday sense of the word? Sam and Rachel worked hard pushing the car.
A force does not work on an object if a component of the forces ... ...is parallel to the displacement of the object.
Work is done when... ...the displacement is not 0.
What is the common formula for work? W=Fd
In which of the following scenarios is work done? A car decelerates while traveling on a flat stretch of road.
In which of the following scenarios is no net work done? A car travels at a constant speed on a flat road.
Which of the following energy forms is associated with an object in motion? Kinetic Energy
Which of the following formulas would be used to directly calculate the kinetic energy of a mass bouncing up and down on a spring? KE=(1/2)mv^2
Which of the following equations expresses the work-kinetic energy theorem? Wnet=DeltaKE
The main difference between kinetic energy and potential energy is that... ... kinetic energy involves motion, and potential energy involves position.
Which form of energy is involved in weighing a fruit on a spring scale? Elastic potential energy
Gravitational potential energy is always measured in relation to... ... a zero level.
What are the units for a spring constant? N/m
Which of the following is a true statement about the conservation of energy? Total energy is always conserved.
Which if the following are examples of conservable quantities? Mechanical energy and mass.
Friction Converts kinetic energy to ... ... potential energy
Which of the following is the rate at which work is done? Power.
A more powerful motor can do ... ... the same work in a shorter time interval.
A car travels at a speed of 25m/s on a flat stretch of road. The driver must maintain pressure on the accelerator to keep the car moving at this speed. What is the net wok done in he car over a distance of 250m? The network is 0 because the net force is 0.
State, in words, the work-kinetic energy theorem. Net work is equal to the change in kinetic energy.
A child does 5.0J of work on a spring while loading a ball into a spring-loaded toy gun. If mechanical energy is conserved, what will be the kinetic energy of the ball when it leaves the gun? 5.0 J
How much work is being done on a bookshelf being pulled 5.00m at an angle of 37 from the horizontal? The magnitude if the component if the force that does the work is 43.0N. 43N times 5.00m = 215 J
What s the average power output of a weightlifter who can lift 250kg a height of 2.0 m in 2.o s? 250kg times 9.81m/s = (2452.5 times 2)/2 = 2452.5 watts
KE=(1/2)mv^2 KE=(1/2)mv^2
PE=mgh PE=mgh
P=w/t P=w/t
A box is pushed 12m across a level surface with a force of 100N. What net work is done if a frictional force of 20N acts in a direction opposite to that of the worker? 100-20=80 times 12= 960J
A geyser shoots water to a height if 25.0m. With what velocity does the water leave the ground? (2)9.81(25)=v^2= 22m/s
Created by: quinn.tomlinson
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