Discuss in your group which part
should you change to make a
catapult that can throw the ball
further than mine.
I will give you 15 minutes to do this,
please stick to the time, we will only
test the group who can make it on time.
Let’s see which group can beat my
record. I will give you 10 minutes to
test your catapult, please be fair and
record the distance as it is. Try it
three times and look for average
distance.
Now let’s compare your
distance and mine.
which part is different?, make
notes about that, and write it in
your exercise book.
Read your text book page 14 to 16.
According to your observation just now,
find an explanation how the different parts
of your catapult allow it to throw the ball
further than mine, and write your
explanation in your exercise book.
In 5 minutes share your explanation with
your friends in group. Do you have the same
explanation? If not, explain to your friend
why your explanation is correct or why
his/hers is wrong, if you cannot wrap it out,
rise your hand and I will come to your group.
What is potential energy? Give example.
Energy that is stored in objects, energy
that is stored in food, fuels and batteries
What is kinetic energy? energy in a moving
object
What energy allow the ball to Potential energy
move away?
During its movement, what
energy is in the ball?
Kinetic energy
Where does this energy
come from?
potential energy
When the potential energy is bigger
it’s
bigger
how is the kinetic energy in the
ball?
According to our experiment in
catapult, mention two things
that make potential energy in
the catapult bigger.
longer throwing stick (stick that
throws the ball) or more popsicle
sticks to make the throwing stick
higher
complete your WB page 16 to 17. Please
read the procedure carefully and follow
it properly.
15 minutes to do this.
1. According to your experiment, how the
height of the ramp affects the distance
travelled by a toy car? Why is this so?
the higher the ramp the further the car
travelled; because the higher the ramp, the
more potential energy that is stored in the car
2. At which point on the ramp does a toy car have the
least gravitational potential energy? How do you
prove this?
At the lowest height of the ramp, the car travelled in
the shortest distance when the height of the ramp at
its lowest point, this prove that the energy stored in
the car at this point is the least
3. how potential energy different with
kinetic energy?
potential energy is energy that is stored
in objects, kinetic energy is found in
moving objects