Download – Lesson 2 PowerPoint

Baseline (flightpath E & D):
Draw
arrows on an object to represent the size and direction of
several forces.
Further (flightpath C):
Describe the forces
as contact or non-contact forces. Demonstrate that when two
objects interact they exert equal and opposite forces on each
other.
Challenge (flightpath B&A):
Describe a
range of forces as contact or non-contact. Explain that when
two objects interact they exert equal and opposite forces on
each other and use the gravity of the earth as an example.
A force applied to an object can change:
• The shape of the object.
• The velocity of the object .
• The direction of the object.
Force diagrams
Rule for drawing force diagrams:
1) The length of the arrow represents the size of the force,
not the width!
2) The direction of the arrow represents the direction of
the force
3) The arrow must start at the specific place where the force
is acting such as friction on the wheels.
Force diagrams
Rule for drawing force diagrams:
1) The length of the arrow represents the size of the force,
not the width!
2) The direction of the arrow represents the direction of
the force
3) The arrow must start at the specific place where the force
is acting such as friction on the wheels.
Now draw force arrows on the objects on your worksheet, remembering to follow the rules above!
A plane travelling at a constant speed
The Indian rope trick
A stationary boat
Ten students are going to compete in a tug-of-war. Here are the forces each of the students can apply,
arrange them into two teams that are balanced. There may be more than one answer!