Download File - Physical Science

Science Starter
• Read the article
• Answer the following questions
– What is inertia?
– Re-write Newton’s Three Laws in your own
words.
Question
• If you and your desk partner were to arm
wrestle, who would win?
• Why?
Lesson Outcomes
• If an object is moving at a constant
speed, what can you say about the
forces on the object?
Level 4
• If an object is getting faster (or
slower), what can you say about the
forces on the object?
Level 4
• Draw force diagrams for balanced and
unbalanced forces.
Level 5
• Calculate the size of a resultant force
and the direct it is acting in.
Level 6
Video
• https://www.youtube.com/watch?v=YyJSlc
Ibd-s
In which direction will these
stationary objects move?
Who
wins?
Air
= 200N
resistance
Accelerating
Weight = 600N
A ball will stay still if the
forces on it are __________.
If the forces on it are
unbalanced, the ball will get
______ or ______. The overall
force is called the
__________ force. If
something gets faster, we say it
is __________.
forces
unbalanced
accelerating
slower
resultant
balanced
stay still
faster
decelerating
Write a question that
someone else must answer!
Force Diagrams
• A book is at rest on a tabletop. Diagram
the forces acting on the book
• An egg is free-falling from a nest in a tree.
Neglect air resistance. Diagram the forces
acting on the egg as it is falling
• A rightward force is applied to a book in
order to move it across a desk at constant
velocity. Consider frictional forces. Neglect
air resistance. Diagram the forces acting
on the book.