You will need:
Tie some string around
the brick so that you can lift it safely, using the rubber band and paper
clips, as shown in the diagram.
Now, try to lift the brick from your desk to the stack of books using your band and clips.
As you lift, get your partner
to measure the length of the rubber band with the ruler.
Record that measurement
here.
Now try a different way
of moving the brick.
Use your board to make a
ramp from the desk to the top of the stack of books.
Pull the brick up along
the ramp.
Get your partner to measure
the length of the rubber band as you pull.
Record that measurement
here.
Can you remember what you
learned in ‘making movement easier 1’ ?
The harder it is to move
the object, the ________________ the rubber band will be.
The easier it is to move the object, the ________________ the rubber band will be.
Which is easier, lifting
the brick straight off the desk or pulling it up along the ramp?
How do you know?
Does this surprise you?
With your partner, try to
predict how making the following changes to your ramp would affect the
way it works.
Then, design fair tests
to investigate your ideas.
what we will change
|
our prediction
|
the length of the ramp
|
|
the surface of the ramp
|
|
|
|
|