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WorksheetsCH. 4 Work and Energy
Total questions: 30
Worksheet time: 15mins
Factors affecting kinetic energy
mass only
work only
mass and velocity
work and velocity
A car has a mass of 960 kg when traveling at a speed of 30m/s. What is its KE?
a. 14,400 J
b. 1600 J
c. 432000 J
d. 864,000 J
At which position does the pendulum bob have the
maximum amount of kinetic energy?
1
2
3
4
At which two positions does the pendulum bob have the same amount of potential energy?
1
2
3
4
Which of the following scenarios shows no work done?
A boy climbing up the hill.
A woman pushing a trolley along a slope.
A lady carries her handbag and walks 30 m along the corridor.
Where would this tossed baseball have the least amount of kinetic energy?
point W
point X
point y
point z
energy is stored energy due to position.
Kinetic
Potential
Chemical
Magnetic
Energy stored in chemical bonds is called .
elastic potential energy
chemical potential energy
kinetic energy
none of these
Anything that can fall to earth has stored energy called .
elastic potential energy
elastic potential energy
kinetic energy
gravitational potential energy
The unit of power is the .
joule
MA
watt
second
Which of the following is not used to calculate potential energy?
mass
gravitational acceleration
height
speed
Work and energy are both measured in .
joules
N
ºC
j/kg
Which of the following groups of simple machines represent variations of an inclined plane?
pulley, lever, and wedge
pulley, wheel and axle
screw, wedge
wheel and axle, screw
Total amount of kinetic and potential energy
in a system
Work
Law of conservation of energy
Mechanical energy
Joule
The ability to cause change
Elastic potential energy
Efficiency
Simple machine
Energy
Energy cannot be created or destroyed
Law of conservation of energy
Mechanical energy
Elastic potential energy
Kinetic energy
Does work with only one movement of the machine
Work
Efficiency
Joule
Simple machine
Ratio of output work to input work
Efficiency
Joule
Mechanical energy
Energy
Force applied through a distance
Work
Efficiency
Joule
Mechanical Advantage
A box is pushed 50 m by a mover. The amount of work done was 2,250 J. How much force (N) was exerted on the box?
F=dW
(a)
Calculate the gravitational potential energy (J) of a 10-kg sack of groceries on a shelf 1 m above the floor?
GPE=mgh
g=9.8 sm
(a)
A carpenter uses a crowbar to remove the top of a box. The top has a resistance of 500 N. The carpenter applies an input force of 200 N. What is the mechanical advantage of the crowbar?
MA=FinputFoutput
(a)
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
How does conservation of energy explain why something that is falling should speed up?
It gains kinetic energy because it gains potential energy.
It loses kinetic energy because no work was done on it.
It gains kinetic energy because it loses potential energy.
It loses kinetic energy because the Earth gains potential energy.
Which of the following is not a way that machines make work easier?
Increases speed
Changes direction of force
Increases force
Make you do less work
Anything that you can imagine a boundary is a ___?
system
machine
power
law of conservation
Energy does not always involve motion.
True
False
Energy from the Sun and energy from food are just different forms of the same thing.
False
True
Which of the following measurements has NO UNIT?
Mechanical Energy
Mechanical Advantage
Power
All measurements in science have units!
Friction and air resistance convert some of the mechanical energy into what kind of energy?
Chemical energy
Kinetic Energy
Potential Energy
Thermal Energy
