a push or pull on an object total amount of force applied to an object
TRANSCRIPT
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FORCES AND MOTION REVIEW
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DEFINE FORCE A push or pull on an object
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WHAT IS A NET FORCE? Total amount of force applied to an
object
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WHAT IS THE WEIGHT OF A 20 KG DOG?W=20kg * 9.8m/s²W= 196N
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WHAT IS THE UNIT OF MEASURE FOR WEIGHT AND FORCE? Newton
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A PORSCHE 911 ACCELERATES FROM REST TO 4.7M/S². THE MASS OF THE CAR IS 1400 KG. WHAT IS THE AVERAGE NET FORCE THAT ACTS ON THE PORSCHE?
F=MAF= 1400 * 4.7F= 6,580 N
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NAME THE 4 TYPES OF FRICTION Static Rolling Sliding Fluid
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WHY DON’T OBJECTS STAY MOVING HORIZONTALLY FOREVER? Gravity and air resistance
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WHAT TYPE OF FRICTION IS AIR RESISTANCE? Fluid friction
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DESCRIBE WHAT HAPPENS WHEN AN OBJECT REACHES TERMINAL VELOCITY
The object is no longer accelerating; force of gravity is equal to the force of air resistance
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A BULLDOZER PUSHES A 60KG CRATE WITH A FORCE OF 180 N. THE FORCE OF FRICTION ON THE CRATE IS 60 N IN THE OPPOSITE DIRECTION. WHAT IS THE ACCELERATION OF THE BOX?
120N=60kg* a120/60=a20m/s²=a
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DEFINE PROJECTILE An object in which the only force acting
is gravity
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AN EMPTY AIRPLANE HAS A MASS OF 30,400 KG AND A TAKEOFF ACCELERATION OF 1.20M/S².WHAT IS THE NET FORCE ACCELERATING THE PLANE? F=MA F=30,400 * 1.2m/s² F=36,480 N
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WHAT IS ANOTHER NAME FOR NEWTON’S FIRST LAW? Law of Inertia
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DEFINE INERTIA Resistance of an object to change its
motion
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USING A VECTOR ARROW, WHAT DOES THE LENGTH OF THE ARROW REPRESENT?
The magnitude (strength)
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HOW CAN YOU TELL WHICH DIRECTION THE NET FORCE IS BEING APPLIED?
The head of the arrow points in the direction of the force
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HOW DOES A BALANCED FORCE AFFECT THE MOTION OF AN OBJECT?
Motion is unchanged if the force is balanced
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DEFINE SPEED The distance traveled over a certain
amount time
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HOW ARE SPEED AND VELOCITY DIFFERENT? Speed is a scalar quantity (magntude
only) and velocity is magnitude and direction
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WHAT HAPPENS TO AN OBJECT’S ACCELERATION WHEN A FORCE IS INCREASED? The acceleration increases
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HOW ARE MASS AND INERTIA RELATED? The greater the mass the greater the
inertia
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TWO TUGBOATS ARE MOVING A BARGE. TUGBOAT A EXERTS A FORCE OF 3000 N TO THE RIGHT. TUGBOAT B EXERTS A FORCE OF 5000 N IN THE SAME DIRECTION. WHAT IS THE NET FORCE ON THE BARGE? ( USE ARROWS TO ILLUSTRATE INDIVIDUAL AND NET FORCE ON THE BARGE)
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HOW DOES SURFACE ROUGHNESS AFFECT FRICTION? The rougher the surface the greater the
friction
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A CAR IS TRAVELING AT 50MPH. HOW LONG WILL IT TAKE THE CAR TO TRAVEL 300 MILES?
300/50T=6 hrs
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IF YOU DOUBLE THE FORCE EXERTED ON AN OBJECT HOW DO YOU KEEP THE ACCELERATION THE SAME?
Increase the mass
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HOW ARE ACTION AND REACTION FORCES RELATED ACCORDING TO NEWTON’S THIRD LAW?
Reaction forces are of equal force to the action but in opposite direction
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HOW DOES AN UNBALANCED FORCE AFFECT AN OBJECT’S MOTION?
It changes the speed or direction
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WHAT IS THE WEIGHT OF A ROCAK THAT HAS A MASS OF 7KG?
F=M*AF= 7 * 9.8F=68.6 N