on your next blank page, take notes force notes. net force in many situations, including driving,...
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On your next blank page, take notes
Force Notes
Net Force
• In many situations, including driving, more than one force is acting on an object.
• The combination of all forces acting on an object is the net force.
• Net force determines whether, and by how much, an object’s motion is changed.
• Total Force
Force Diagrams
• Objects are shown as a rectangle or square.
Force Diagrams
• A push or pull (force) is shown with an arrow
Force Diagrams
• The arrow always points AWAY from the object.
Force Diagrams
• The bigger the force, the bigger the arrow
Force Diagrams
• Label the arrows with the magnitude (amount) of the force (in N)
10 N3 N
Force Diagrams
• Net Force is the sum of all of the forces
10 N3 N
7 N
Practice:
• Draw an object with two forces acting in opposite directions with one force equal to 2 N and one force equal to 8 N.
Force Diagrams
8 N2 N
Net Force
• Draw the net force acting on this object.
8 N2 N
Force Diagrams
Net Force
6 N
Balanced vs. Unbalanced Forces• If there is a situation of unbalanced forces,
there is a net force.
• Balanced forces mean there is a net force of zero on the object.
• Describe the motion of the blocks below.
10 N2 N
8 N8 NA.
B.
Read pg. E-37
Activity 81
Title: The Net Force Challenge
Problem: How can you tell if the forces on an object are balanced or unbalanced?
Hypothesis: If _____________, then ______________________________.
Read the procedure on pages E-38 to E-39
Data/Evidence:
Part A: Balanced Forces
Step 3.
Part B: Unbalanced Forces
Step 6.
Step 7.
Etc.
Spring Scale
• BE GENTLE!!!!
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