NEW
Font size
WorksheetsWORK POWER AND ENERGY
Total questions: 50
Worksheet time: 52mins
The roller coaster car has a mass of 500 kg. It is pulled from position 1 to 2 (30 m) by a motor. At the top of the ride the vertical distance top to bottom is 20 m. The motor pulls the car with a 4000 N force. Calculate the work done getting the car to the top of the ride.
100 000J
120 000J
800 000J
90 000J
Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.
1600 J
160 J
3600 J
1800 J
An 80 N rope tension force is used to slowly pull a wagon 50 m up a hill. Calculate the work done by the rope if it pulls parallel to the hill
-4000 J
4000 J
What percent energy is wasted by a machine if the energy input is 262 J and the energy output is 131 J?
5%
50%
100 J
What is the work output of a machine that has a work input of 2,800 Joules and an efficiency of 90%?
25200 J
2520 J
0.0082J
A weight-lifter raises a 2000N weight through a vertical height of 2.0m in 0.80s. What useful power does he develop in doing this?
800 W
700W
4000W
5000W
Who has the most power?
Ms Criza who encodes her observation tools using 12000J of work in 20 minutes.
Sir Pau who studies his 5 lessons for the next classes in 15 minutes.
Mrs Punzalan who used 50N force to inoculate mushrooms at a speed of 2m/s.
Mrs Masalunga who watches her learners while taking their quiz in 30 minutes.
Which statement illustrates work done?
A weightlifter holds a barbell above her head.
A teacher applies a force to a wall and becomes exhausted.
A rolling marble hits a note card and moves it across a table.
A waiter carries a tray full of meals across a dining room at a constant speed.
If the mass of the cart is 15kg, how much is the potential energy of the cart?
0J
1.2J
6J
58.8J
Which of the following is the best example of work being done.
doing homework
lifting a box
pushing a stationary box
holding a box
Work causes a change in
Sweat
Energy
Calories
Force
Power is a _______ dependent quantity.
Outlet
Energy source
Time
Volume
Kinetic energy is associated with ---.
speed
position
direction
temperature
Where is the kinetic energy of pendulum at its highest?
at the top of the swing
at the bottom of the swing
at 1/4 of the swing
at 3/4 of the swing
Where does the pendulum have the least amount of potential energy?
A
B
C
D
E
Where is kinetic energy at its maximum?
a
b
c
d
A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is(g = 10 m/s2)
(a) 500 J
(b) 50 J
(c) 5 J
(d) 5000 J
A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is(g = 10 m/s2)
(a) 500 J
(b) 50 J
(c) 5 J
(d) 5000 J
what is defined as the product of the magnitudes of displacement and the
component of the force parallel to the displacement ?
work
energy
momentum
power
When an object is carried at a constant
velocity by a force,
no work is done on the
object.
the work done is maximum on the
object.
the work is done minimum on the
object.
the work done is 100 % on the
object.
The unit of work is
watt
hertz
joule
pascal
What is the unit for power?
what
watt
joule
Jewel-Osco
Which requires more WORK – a person WALKING up stairs OR a person RUNNING up stairs?
walking
running
they require equal work
no work is required for either because the movement is vertical
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
Which does not illustrate kinetic energy?
It is expressed in Joule.
It depends upon the objects’ mass and speed.
It is the energy an object possesses due to its motion.
It depends upon the objects’ mass and objects’ height.
As speed increases, kinetic energy
Increases
Decreases
Stays the same
Increase then decrease
If a 4 kg cat is running at 3 m/s what is its kinetic energy?
18 J
18
12
12 J
The kid at the top of the roller coaster car pictured here has
100% Potential Energy
0% Kinetic Energy
75% Potential Energy
25% Kinetic Energy
50% Potential Energy
50% Kinetic Energy
0% Potential Energy
100% Kinetic Energy
Elastic Potential
Gravitational Potential
At halfway down the track
C
D
E
When you compress a spring, you are storing __________ energy.
sound
elastic
kinetic
chemical
The formula for gravitational potential energy (GPE) in an object is U = mgh.
Which object will have the largest value for its GPE?
If these are all moving at the SAME SPEED, which vehicle has the greatest Kinetic Energy?
(Think about their sizes)
Which type of energy causes the arrow to shoot from the bow?
hooke's law
The diagram shows the same spring being stretched at different lengths using different masses. At which length does the spring have the MOST potential energy?
length A
length B
length C
length D
A box is being pushed horizontally on an inclined surface by 15 N of force, in a distance of 3.5 m. Calculate the work generated by the 15 N or force?
52.5 Joule
60 Joule
55.5 Joule
59 Joule
Figure shows a 10 N force acting on a box. The box moves 5 m to the right. Calculate the work done by the force.
50 J
50 N
O J
5 J
A boy pulls a 30 kg box up a smooth plane inclined at 30o to the horizontal as shown in figure. If the length of the plane is 5 m, calculate the work done in pulling the box to the top of the plane.
1471.5 J
129.9 J
1274.36 J
735.75 J
All the statements are true about Principle of Conservation Energy, except...
States that energy can neither be created nor destroyed, but can be converted from one form to another
Potential Energy + Kinetic Energy = 100% (Maximum Energy)
Potential Energy and Kinetic Energy is equal to each other
If the Potential Energy is at maximum, the Kinetic Energy is at minimum.
If 40 Watt of power dissipated for 30 min, how much work is done.
72000 J
7200 J
720000 J
720 J
Which formula is not related to Efficiency?
Efficiency = (Energy output/Energy input) x 100%
Efficiency = (Output work/Input work) x 100%
Efficiency = (Power output/Power input) x 100%
Efficiency = (Energy output/Power input) x 100%
