Transcript Jeopardy Unit 3a Energy

Workin’
9 to 5
Energy
Abound
Energy
Concept
Practice
Super
Power
Grab Bag
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This is the unit for
work.
Answer: Joules (J)
The two conditions that
must be met in order for
work to be done.
Answer: A force must be
applied and the object
must move.
You move cart of
pumpkins 15 meters. This
requires a force of 65N.
How much work was
done while moving the
pumpkins?
Answer: 975 J
A small child weighs 25 N. If
they do a somersault and move a
distance of 3 m, how much work
was done?
Answer: 75 J
How far did you push a
12kg barrel of bats if
you did 276 J of work
and pushed at a rate of
3m/s2?
Answer: 7.67 meters
Two race cars have the same mass
but different velocities. The car
with the slower velocity has ____
kinetic energy than the other car
does.
Answer: less
List the type of potential
energy each object has:
a. Carrot
b. Trampoline
Answer:
a. Chemical
b. Elastic
How much energy does of a 4
kg apple have that is
thrown at a speed of 2 m/s?
Answer: 8 J
How much potential energy
does a bird have that weighs
9 N and is sitting on a branch 3
m high?
Answer: 27 J
What is the mass of a picture
that falls of a shelf 6 m high
and has 150 J of energy?
2.55 kg
Electric Blanket
Answer: electrical to thermal
Fireworks
Answer: chemical to
light/sound/thermal
A pear falling off a tree
limb
Answer: GPE to kinetic
Solar panel
Answer: radiant to electrical
A man eating dinner and
then tap dancing
Answer: chemical to kinetic to
sound/thermal
Answer: 2
Answer: d
What is the difference between thermal
energy and mechanical energy?
Answer: Thermal energy = sum of kinetic
and potential energy of particles in an
object
Mechanical energy = sum of kinetic and
potential energy in a system
How much heat is needed to warm 0.098 kg
of gold from 15°C to 30°C? Note: Gold
has a specific heat of 136 J/kg/°C
Answer: 200 J
What is the height of a device that has
a mass of 4 kg and is moving at a rate
of 9 m/s? Assume all energy is
conserved.
4.13 m
What is the unit for
power?
Answer: W or J/s
Define power.
Answer: the amount of
work done in a certain
time
How much power is used if a force of
70 N is used to push a box a distance of
20 meters in 5 seconds?
Answer: 280 W
How long would it take to
do 36 J of work if it requires
4 Watts of power?
Answer: 9 s
This is energy in
motion….
Answer: kinetic energy
This is energy stored in
springs…
Answer: elastic pe
A motorcycle and rider have a mass of
28 kg. If the cart accelerates at 6 m/s2
during a 40 m sprint in 100 seconds,
how much power did the cart do?
Answer: 67.2 W
A pulley is used to lift a
person weighing 150 N . The
person is lifted 3 meters in
25 seconds. How much
power is used?
Answer: 18 W
How far did Katie lift a 8 kg
mass if she did 490 J of work?
Answer: 6.25m
A 9 kg pineapple falls from
a tree that is 58 m tall. How
much energy does the
pineapple have?
Answer: 5115.6 J
What is the mass of a ball
moving at a speed of 26 m/s
with 1200 J of energy?
Answer: 3.55 kg
Answer: