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WorksheetsUnit 5: work/power/energy
Total questions: 50
Worksheet time: 30mins
Kilograms measures weight
true
false
Unit for mass
Kilograms (kg)
Newtons (N)
Joules (J)
Watts (W)
Simple machines, like with a ropes of a pulley, or a moving dolly which _______ the distance from an object,
allowing less force to be required to the same task (amount of work).
increase
decrease
the same
is unknown
Simple machines, like with a ropes of a pulley, or a moving dolly which change the distance from an object, so that the force need to do a job is _______ .
increase
decrease
the same
is unknown
Simple machines, like with a ropes of a pulley, or a crowbar increase the distance from an object you want to move,
so that the force need to do a job is less.
The job doesn't change, the amount work of done is _________ ,
it's just easier for us to do job.
increase
decrease
the same
is unknown
Energy due to motion is ____________ energy.
kinetic energy
potential energy
__________ is stored energy.
kinetic energy
potential energy
The graph is an example of ___________
an object in free fall
(Full KE, increasing as the object gets closer to the ground)
energy conservation of a swinging object (KE+PE =100% total E
the type of energy switches between the 2)
A car coming to a stop
(slowing down and staying at rest)
When a pendulum swings, where is potential energy the greatest?
1 and 5
2 and 4
3
apple sauce
When a pendulum swings, where is Kinetic energy the greatest?
1 and 5
2 and 4
3
apple sauce
Conservation of energy means that energy cannot be ________ or ________, but can changed from one forms, such as electircal to mechanical or KE to PE.
created, destroyed
gravity, force
heat, created
Luke, Baby Yoda
When a roller coaster is at the top of a hill it has
High potential energy
low potential energy
When the roller coaster is in the middle of a hill it has
High Potential Energy
Low Potential Energy
Kinetic and Potential Energy are equal.
When the roller coaster is at Point B (the bottom of a hill) it has
High Kinetic Energy
Low Kinetic Energy
Kinetic and Potential Energy are equal.
If point A is 460 Joules of Energy what is the energy at point B, D, and F?
recall: at the top it's 100%PE and 0% KE at A,
think what is the % of KE at B, D, F; so total amount is always present.
230 J
0 J
460 J
I have a rock in my shoe, I can't help right now
When it takes twice as long to blow dry your hair, 30 minutes instead of 15 minutes, that is because the motor is ________ the power.
double
half
the same
broken
When it takes half as long to blow dry your hair, 7 minutes instead of 14 minutes, that is because the motor is ________ the powerful.
double
halve
the same
broken
A 8kg bowling ball and 1kg baseball are dropped for 30meters. Which has the greatest potential energy?
Both have the same amount
The bowling ball
The baseball
Neither one
A 8kg bowling ball and 1kg baseball are dropped for 30meters. What cause the difference in PE?
height
gravity
mass
velocity
A 8kg rock is dropped for 17 meters and 8kg baseball is dropped for 12 meters. What cause the difference in PE?
height
gravity
mass
velocity
How has the greater KE?
they have the same KE
Purple
Blue
Not enough info
What makes the difference in KE?
height
gravity
mass
velocity
2 mice are racing, Which has the greater Kinetic Energy?
they have the same KE
Top mouse
Bottom mouse
Not enough info
What makes the difference in KE?
height
gravity
mass
velocity
If it takes Max half as long to staple 4 stacks of paper than it does for Dee, who did the most work?
they did the same amout
Max did double
Max did half
Dee did zero
Work is influenced by time
Yes
No
Outlook not so good
try again later
Unit for Potential Energy
Kilograms (kg)
Newtons (N)
Joules (J)
Watts (W)
What is the formula for Gravitational Potential Energy?
PE = mgh
KE = 1/2mv2
W = Fd
P = W/t
A leopard with a mass of 55.00 kg climbs 12.0 m up a tree. What is its GPE?
*gravity = 9.81m/s2
use a calculator!!
Unit for Kinetic Energy
Kilograms (kg)
Newtons (N)
Joules (J)
Watts (W)
What is the formula for Kinetic Energy?
PE = mgh
KE = 1/2mv2
W = Fd
P = W/t
What is the KE of a football which has a mass of 0.8 kg and is kicked at a velocity of 10m/s?
80 J
3.2 J
160 J
40 J
Weight is a
Force
Kinetic Energy
Potential Energy
Power
Work
A push or pull between 2 objects
Force
Kinetic Energy
Potential Energy
Power
Work
Weight is a
Force
Kinetic Energy
Potential Energy
Power
Work
Unit for Force
Kilograms (kg)
Newtons (N)
Joules (J)
Watts (W)
Formula for Weight
F=mg
PE=mgh
KE=21mv2
w=Fd
P=w/t
A 2 kg frog is falls a distance of 5 meters at constant speed in 10 seconds. The weight of the frog is _______ Newtons?
2.5
10
19.62
20
0, no work is done because force influencing isn't in the direction of displacement
Force applied to a body causing it to move in parallel direction
Force
Potential Energy
Power
Work
Unit for work
Kilograms (kg)
Newtons (N)
Joules (J)
Watts (W)
Formula for Work
F=mg
PE=mgh
KE=21mv2
w=Fd
P=w/t
A 2 kg frog is falls a distance of 5 meters at constant speed in 10 seconds. The work done on the frog is _______ Joules?
2.5
19.62
20
98.1
0, no work is done because force influencing isn't in the direction of displacement
A 2 kg frog is carried a distance of 5 meters across the yard in 10 seconds. The work done on the frog is _______ Joules?
2.5
19.62
20
98.1
0
A 2 kg frog is carried a distance of 5 meters across the yard in 10 seconds. The work done on the frog is _______ Joules?
2.5
19.62
20
98.1
0, no work is done because force influencing isn't in the direction of displacement
A weightlifter holds a 100 kg barbell above her head. Is work done?
Yes because there is a force applied to the barbell and the force causes a displacement of the barbell.
No because no displacement occurred.
A puppy carrying a 2 bone. Is work done to carry the bone across the road?
Yes because the force acting on the bone causes a displacement in the direction on that force.
No because no displacement occurred in the direct of the force influencing the bone
work completed in an amount of time
Force
Kinetic Energy
Potential Energy
Power
Work
Formula for Power
=mg
=mgh
=21mv2
=Fd
=w/t
A 100 N force is applied to move an object a horizontal distance of 5 meters at constant speed in 10 seconds. How much power is done?
50J
50W
500J
500W
