1. STAAR Review DAY 4 FORCE, MOTION, AND ENERGY
TEKS 8.6A (R), 8.6B (S), 6.8C (S), 6.7D (S)
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2. Forces Consider the forces acting on these books.
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Gravity pulling downward
Consider the forces acting on these books.
Are the books moving?
Are the forces balanced or unbalanced?
Air pressure
Air pressure
Table pushing upward

3. Forces
Balanced Forces - occurs when multiple forces acting on an objects does not cause an object to change its speed
Unbalanced Forces - occurs when multiple forces acting on an object causes the object to increase or decrease speed
Identify if these items are examples of
BALANCED or UNBALANCED forces.
Constant speed
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4. Balanced or Unbalanced
What is the net force acting on these objects?
Will these objects change speed?
2 N
15 N
NET:
2 N Forward
NET:
10 N Down
3 N
1 N
25 N
2 N
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5. Speed, Velocity, and Acceleration
Speed – the distance an object travels in a certain amount of time
Velocity – the speed and direction of an object
Acceleration – a change in velocity
An airplane flies from Dallas to Boston, a distance of 1500 miles, in 4 hours. Describe the flight of the airplane in terms of average speed and velocity. When does the airplane accelerate?
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6. Speed, Velocity, and Acceleration
Speed – the distance an object travels in a certain amount of time
Velocity – the speed and direction of an object
Acceleration – a change in velocity
Average Speed: 375 miles/hour
Velocity: 375 miles/hour to the northeast
Positive acceleration occurs at takeoff;
Negative acceleration occurs at landing
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10. E D I H F B A G C
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