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Page 1: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

Page 2: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

Page 3: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

An object at rest will stay at rest, unless an outside force is placed on it.

Commonly known as Inertia

Page 4: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

Sport examples:Statics – athlete/object is motionless

Olympic lifterDiver before a diveGymnast after the landing

Dynamics – athlete/object is in motion.

Cyclist coasting at a constant velocitySkier coasting at a constant velocity

Page 5: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

Is the most complicated of the laws

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

The change of motion of an object is proportional to the force impressed; and is made in the direction of the straight line in which the force is impressed.

Page 6: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

Formula

F=ma

F = Force (1N) 1lb = 4.5N

m = mass (kg)1kg = 2.2 lbsWeight = mass x acceleration of gravity W = mgW = 1 kg x (9.8 m/s2) = 9.8 N

a = acceleration of gravity 9.8m/s2 or 32.2 ft/s2

Page 7: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

What is a Force?A vector defined by the size and directionA → to the right (+) or a ← left (-). The length = the force. The longer the line the greater the force, and vice versa on shorter The same for the Up ↑ (+) and the down ↓ (-) arrow.

There are different types of force:Tensile Force (Pulling a rope)

Compressive Force (Pushing together)

Non contact forces – Gravity, magnetic forces, electricity

Page 8: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

Net Force = the sum of all external forces acting on an object. F = F1+F2+F3+…..Statics – Bodies at rest equal zero

F = 0

Collinear forces – in the same line, maybe in the same or opposite direction and may be added to determine resultant force.

Example: Tug –of – War Team 1 has 3 members exerting the following forces: 100N, 200N, 400N and team 2 has 3 members exerting the following forces: 200N, 300N, 500N; who will win? Team 1 Team 2

(-100N + - 200N + -400N ) + (200N + 300N + 500N )

(-700N) + (1000N)

= 300NTeam 2 is the winner due to 300N more force.

Page 9: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

Click the box below to view example

http://www.youtube.com/watch?v=iwP4heWDhvw&feature=player_detailpage

Page 10: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

Pitching a baseballHow fast is the ball moving?

WeightliftingHow much force do I need to lift this weight?

Track and FieldHow fast is that person running?How much force is needed to throw the shot-put 50 feet?

Page 11: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

For every action, there is an equal and opposite reaction.Action equals Reaction

Page 12: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

HITTING A BASEBALL KICKING A FOOTBALL

Page 13: An object at rest will stay at rest, unless an outside force is placed on it. Commonly known as Inertia An object at rest will stay at rest, unless

◙ Baseball

◙ Football

◙ Basketball

◙ Track

◙ Gymnastics

◙ All Sports use Newton’s Laws

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