1. 1. What is a What is a Force Force ? ? Page #:_____ Paragraph Page #:_____ Paragraph #: ___ #: ___ Answer Answer : : • Force is push or pull Force is push or pull Write an Example : Write an Example : • Throwing a baseball Throwing a baseball 36 36 2 2
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1.What is a Force? Page #:_____ Paragraph #: ___ Page #:_____ Paragraph #: ___ Answer: Answer: Force is push or pull Force is push or pull Write an Example.
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3. When 3. When 2 forces2 forces cancel cancel each other out and they each other out and they don’t change the object’s don’t change the object’s velocity, they are called?velocity, they are called?
AnswerAnswer::• If the If the net forcenet force on an object is on an object is
zerozero,, the object will the object will remainremain at at restrest,, or if it’s moving, it will or if it’s moving, it will continue movingcontinue moving in straight in straight line at line at constantconstant speed. speed.
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8. What is 8. What is FrictionFriction?? Page #:_____ Paragraph Page #:_____ Paragraph #:_____#:_____
AnswerAnswer::• The force that brings The force that brings
nearly everything to a nearly everything to a
STOP!!STOP!! Resists sliding between Resists sliding between
2 objects2 objects
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9. 9. Give example of how Give example of how FrictionFriction works works..
• It is caused by the It is caused by the attraction attraction between the atoms between the atoms on the two on the two surfaces that are in contact.surfaces that are in contact.
• The The smoothersmoother the surfaces the the surfaces the less attraction between the less attraction between the atomsatoms!!!!
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11. What causes 11. What causes Static Static FrictionFrictioncont…….cont…….
• Static Friction prevents an object at rest from moving when a force is applied
12.12.Static FrictionStatic Friction acts on acts on an an
object at rest.object at rest. Page #:_____ Page #:_____ Paragraph #:_____Paragraph #:_____
True or FalseTrue or False
AnswerAnswer::• TrueTrue
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13. What does 13. What does Sliding Sliding FrictionFriction do? do?
A.A. Rolling FrictionRolling Friction between wheels between wheels
and groundand ground
B. B. Sliding FrictionSliding Friction between box between box
and groundand ground• AnswerAnswer: :
B – B – Sliding FrictionSliding Friction
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Review questionsReview questions1. How would you describe a Force?
Answer: Push or a Pull
2. What is Net Force?
Answer: Combination of all the Forces
3. Describe what it means when forces are Balanced?
Answer: The forces acting on the object
are equal. Object does not move.
Review questionsReview questions4.4. What is the What is the Net forceNet force when when ForcesForces
areare
BalancedBalanced??
AnswerAnswer: Net force is “: Net force is “Zero”Zero”
Object stays where it Object stays where it is!!!!!!is!!!!!!
Both boys are using sameBoth boys are using same
Force or pushing equally.Force or pushing equally.
The The DOOR DOESN’TDOOR DOESN’T
MOVEMOVE!!!!!!!!!!!!!!
Review questionsReview questions5.5. What happens when What happens when ForcesForces are are
UnbalancedUnbalanced??
AnswerAnswer: : UnbalancedUnbalanced Forces are Forces are not not
equal and the object equal and the object will move!!!will move!!!
The boy on the left is usingThe boy on the left is using
greater forcegreater force, therefore he is, therefore he is
pushing the door towardpushing the door toward
the boy on the right!!!the boy on the right!!!
Review questionsReview questions
6.6. What are the 3 types of What are the 3 types of FrictionFriction
or or Frictional forcesFrictional forces??
Answer:Answer:
StaticStatic friction friction
SlidingSliding friction friction
RollingRolling friction friction
Review questionsReview questions7. How is Force measured?Answer: In a unit called Newton8. What is a Newton?Answer:
One Newton (symbol NN) is the forcethat will give an object whose is
mass 1kilogram an acceleration of 1 meter
persecond squared.
N=1 kg·m/s²N=1 kg·m/s²
Review questionsReview questions9. In a tug of war, one student is
pulling on a rope with a force of 10N and the other student with 8 N. What is the Net force on the rope? Or, the actual amount of force pulling on the rope?
Answer:It is the difference between
the stronger and the weaker force
10N – 8N = 2N10N – 8N = 2N
Review questionsReview questionsStudy the diagram carefully and answer the questions
10. Are the 10. Are the ForcesForces on on the box the box BalancedBalanced or or UnbalancedUnbalanced?? Answer: