Forces notes 1 and 2
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Forces Notes #1
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• Force = a push or pull in a particular direction.
• Forces can affect motion in several ways:–They can make objects:
• start moving• stop moving•move faster•move slower• change direction• change shape
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• Forces are measured in Newtons–You need about 1 N to lift a burger–You need about 20 N to lift a 2 liter bottle
• Forces usually act in pairs
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• Forces are measured in Newtons• Forces usually act in pairs • Forces act in a particular direction• Forces usually cannot be seen, but their
EFFECTS can be seen.
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Which forces are pushing, which are pulling? AND... Do they change the speed or direction of the object or both speed and
direction?
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Which forces are pushing, which are pulling? AND... Do they change the speed or direction of the object or both speed and
direction?
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Which forces are pushing, which are pulling? AND... Do they change the speed or direction of the object or both speed and
direction?
![Page 9: Forces notes 1 and 2](https://reader036.fdocuments.in/reader036/viewer/2022062405/555b3cd3d8b42af36d8b45e9/html5/thumbnails/9.jpg)
Which forces are pushing, which are pulling? AND... Do they change the speed or direction of the object or both speed and
direction?
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Which forces are pushing, which are pulling? AND... Do they change the speed or direction of the object or both speed and
direction?
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• Contact forces – forces exerted by two objects touching each other.
• Noncontact forces – forces exerted without objects touching. Examples:
•Gravity• Electricity•Magnetism
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VECTORS• All forces can be expressed in vectors.• A vector is the direction and power of a force.• Vectors are expressed with arrows. • The arrow points in the direction of the force.• The longer the arrow – the greater the force.
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Quickystarty! 9/30• Each solid rocket booster on the space shuttle
has about 14 kilonewtons of thrust. How much combined force do they have together?
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Forces Notes #2
• Net force = all the forces acting on an object at once.– Go to page 90 and 91 in your textbook.– Write what “unbalanced forces” and “balanced
forces” mean. • When the forces acting on a soccer ball are
unbalanced, the ball will move. • When they’re balanced – the ball won’t move.
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Newton’s First Law of Motion
• “Objects at rest tend to stay at rest – objects in motion tend to stay in motion.”
• Inertia: the tendancy of an object to resist a change of motion.
• A car and a paper airplane are both going the same speed – but the car is much harder to stop. It has more inertia because it has more mass.
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Standards check
• Answer questions 1 through 8 on page 94 – skip number 5.
• Bridge Design Videos:• https://www.khanacademy.org/partner-content/mit-k12/mit-k12-physics/v/bridge
-design--and-destruction---part-1
• https://www.khanacademy.org/partner-content/mit-k12/mit-k12-physics/v/bridge-design--and-destruction---part-2
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Popsicle Stick Bridge Budget
• http://www.syp.mtu.edu/docs/Lesson_Plans/Building%20a%20Bridge%20on%20a%20Budget.pdf