Forces--Review
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Forces-- Review
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Forces--Review. Newton’s Laws of Motion:. 1 st Law(Law of Inertia)—an object at rest stays at rest and an object in motion stays in motion unless acted on by some unbalanced force. - PowerPoint PPT Presentation
Transcript of Forces--Review
Forces--Review
Newton’s Laws of Motion:
1st Law(Law of Inertia)—an object at rest stays at rest and an object in motion stays in motion unless acted on by some unbalanced force.
2nd Law(Law of Acceleration)—relates force, mass, and acceleration in the equation.. F = m x a
3rd Law—For every action, there is an equal but opposite reaction.
Which of Newton’s Laws?
1st Law? 3rd Law?2nd Law?
Which of Newton’s Laws?
Which of Newton’s Laws is shown in the video clip below?
Which of Newton’s Laws?
Which of Newton’s Laws?
A) 1st B) 2nd C) 3rd D) 4th
Which of Newton’s Laws?
A) 1st B) 2nd C) 3rd D) 4th
Balanced or Unbalanced?Find the Net Force
Balanced
FNet = 0 N
40 N 40 N
Balanced or Unbalanced?Find the Net Force
unbalanced
FNet = 50 N left
80 N 30 N
Let’s try and put what you know
about balanced and unbalanced forces together with my
2nd law of motion. Sir Isaac Newton—1642 - 1727
I’m the Man!!
Solve for the unknown:
m = 5 kga = ?
Fnet = 10 N right
Solve for the Unknown:
m = ?a = 4 m/s/s left
FNet = 40 N Left
Solve for the Unknown:
m = 10 kga = 3 m/s2 Right
Which force is bigger?RightHow much bigger? use F = ma
25 N + 30 N = 55 N
55 N
Solve for the Unknown:
m = 6 kga = 4 m/s2 left
Which force is bigger?LeftHow much bigger? use F = ma
80N – 24 N = 56 N
56 N
Solve for the Unknown in the following diagram:
A) 22 m/s/s leftB) 6 m/s/s leftC) 5 m/s/s leftD) 4 m/s/s left
Solve for the Unknown in the following diagram:
A) 20 kgB) 12 kgC) 8 kgD) 4 kg
Solve for the Unknown in the following diagram:
A) 50 N rightB) 50 N leftC) 20 N rightD) 120 N right
Solve for the Unknown in the following diagram:
A) 40 NB) 60 N C) 100 ND) 160 N
Besides formulating his 3 laws of motion, What else did Newton do??
Johannes Kepler It’s Story time
Newton’s Law of Universal Gravitation• Any 2 objects have a force of attraction
between them, the size of which depends on 2 things:1. Mass of the object(direct relationship).• The larger the mass, the larger the force of attraction.
2. The distance between the objects(inverse relationship).• The greater the distance between the two objects,
the smaller the force of attraction.
Which of the following pairs has the greatest force of attraction?
or
A B
Which of the following pairs has the greatest force of attraction?
or
A B
