WorksheetsChapter 4: Work, Energy and Power SP015 (C1&C2)
Total questions: 20
Worksheet time: 20mins
In which one of the following situations is zero net work done?
A ball rolls down an inclined plane.
A physics student stretches a spring.
A projectile fall towards the surface of Earth.
A box is pulled across a rough floor at constant velocity.
A ball is thrown directly upward. Which of the following is TRUE before it reaches its maximum height?
A. Its potential energy increases and kinetic energy decreases.
Its potential energy always equals to kinetic energy.
Its potential energy decreases and kinetic energy increases.
Its potential energy is 0 J and kinetic energy is constant.
Which one of the following situations will there be an increase in the kinetic energy?
A stone is thrown upward until it reaches maximum height.
A ball starts from rest and freely rolls downhill.
A box is pulled across a rough floor at constant speed.
A satellite travels in a circular orbit around the Earth at fixed altitude.
Which one of the following systems is there a decrease in gravitational potential energy?
A boy stretches a horizontal spring.
A girl jumps down from a bed.
A crate rests at bottom of an inclined plane.
A car ascends a steep hill.
1 Joule can be defined as work done by
A force of 1 N which results in a displacement of 1 m in the direction of force.
A force of 1 N which results in a displacement of 1 cm in the direction of force.
A force of 1 N which results in a displacement of 10 m in the direction of force.
A force of 1 N which results in a displacement of 1 km in the direction of force.
When a body slides against a rough horizontal surface, the work done by friction is
Positive.
Zero.
Negative.
Constant.
In force against displacement graph, the area under the graph represents
Velocity.
Acceleration.
Force.
Work done.
A car accelerates uniformly from rest. When does the car require the greatest power?
When the car first accelerates from rest.
Just as the car reaches its maximum speed
The question is misleading because the power required is constant.
When the car reaches half its maximum speed
If the speed of a particle is doubled, what happens to
its kinetic energy?
It becomes four times larger.
It becomes two times larger.
It becomes half
It is unchanged.
A block of mass m is dropped from the fourth floor of an office building, subsequently hitting the sidewalk at speed v. From what floor should the mass be dropped to double that impact speed?
the eighth floor
the tenth floor
the twelfth floor
the sixteenth floor
Devon and Shahrul are loading identical cement blocks onto Shahrul’s pickup truck. Devon lifts his block straight up from the ground to the truck, whereas Shahrul slides his block up a ramp on massless, frictionless rollers. Which statement is true?
Devon does more work than Shahrul.
Devon and Shahrul do the same amount of work.
Shahrul does more work than Devon.
None of these statements is true
When a body falls freely towards the earth, then its total energy
increases
decreases
remains constant
first increases and then decreases
In which of the following situations do your arms do work on books?
Holding a heavy stack of books while standing
Carrying a heavy stack of books
Dropping a stack of books onto a table
Picking up a pile of books from the floor
If there is no friction on this track, at which point would the coaster have the most kinetic energy?
A
B
C
D
Where is the roller coaster gaining potential energy?
A to B
B to C
C to D
The roller coaster is always losing potential energy
What is needed to calculate power?
Work
Time
Mass
Distance
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
Which statement DOES NOT illustrate power?
A farmer plowing the rice field all day.
A Siberian husky pulling a sled all day.
A principal sitting on a chair while observing several classes all day.
A teacher encoding his power point presentation in his laptop all day.
Which of the following is a TRUE statement about work?
It measures how quickly an object accelerates
It measures how much force is applied over a certain distance
It measures the change in an object's rate of speed
It measures how much time it takes to move a massive object
