motion speed, velocity, acceleration & forces
DESCRIPTION
Motion Speed, Velocity, Acceleration & Forces. Frame of Reference. Object or point from which motion is determined. What is Motion?. Motion: A change in position of an object compared to a reference point Motion involves all of the following:. What is motion?. - PowerPoint PPT PresentationTRANSCRIPT
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MotionSpeed, Velocity,
Acceleration & Forces
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Frame of Reference
Object or point from which motion is
determined
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What is Motion?
Motion: A change in position of an object compared to a reference point
Motion involves all of the following:
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What is motion?
• If you are standing in one place, and your friend walks by you, are you moving relative to your friend?
– Is your friend moving relative to you?
– Is either of you moving relative to the earth?
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Answer:
• You are moving relative to your friend, and your friend is moving relative to you!
• You (the Joker) are not moving relative to the earth, but your friend is. You are both moving relative to the sun!
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What is motion?
• If you and your friend are walking down the hall together at the same speed, in the same direction, are you moving relative to your friend?
– Is your friend moving relative to you?– Are either of you moving relative to the earth?
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Answer:• You are NOT moving relative to
your friend, and your friend is NOT moving relative to you. You both are moving relative to the earth.
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What is Motion?
SpeedThe rate of change in position
Speed = distance ÷ time or = distance time
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Speed
Example: A car travels 300km in 6 hours. What is the speed of the car?
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Answer:Answer:
•Speed = distance ÷ timeSpeed = distance ÷ time•Speed = 300km ÷ 6 Speed = 300km ÷ 6
hourshours•Speed = 50km/hrSpeed = 50km/hr
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More practiceMore practice
•1. How far can a plane travel 1. How far can a plane travel if it flies 800km/hr for 9 hours?if it flies 800km/hr for 9 hours?
•2. How long does it take a ship 2. How long does it take a ship to go 500 km if it travels at a to go 500 km if it travels at a speed of 50km/hr?speed of 50km/hr?
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AnswersAnswers
1.1.7200km/hr7200km/hr2.2.10 hours10 hours
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What is Motion?
VelocitySpeed plus direction
Example: 50 km/hour north
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Velocity
•Speed in a given direction.
•What is the velocity of a boat that travels from Lancaster to Baltimore(10 miles) in 15 minutes?
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Answer
•Speed = distance ÷ time•Speed = 10 miles ÷ 15
minutes•Speed = 0.67 mi/min•Velocity = 0.67 mi/min NW
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AccelerationAcceleration•Change in velocityChange in velocity
– Can be change in speed Can be change in speed oror direction direction
AccelerationThe rate of change in velocityPositive acceleration = speeding upNegative acceleration = slowing down (decelerate)
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Acceleration = Vfinal – Vinitial
Time or
= ∆Velocity Time
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Acceleration problemAcceleration problem• A roller A roller
coaster’s coaster’s velocity at the velocity at the top of a hill is top of a hill is 10m/s. Two 10m/s. Two seconds later it seconds later it reaches the reaches the bottom of the bottom of the hill with a hill with a velocity of velocity of 26m/s. What is 26m/s. What is the acceleration the acceleration of the roller of the roller coaster?coaster?
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ANSWER:
a = 26m/s – 10m/s 2 s
a = 16m/s 2s
a = 8m/s/s or 8m/s2
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FORCE = Any push or pull which causes something to move or change its speed or direction
What is a Force?
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Forces can be BALANCED or UNBALANCED
Balanced forces are equal in size and opposite in direction
UNbalanced forces are not equal in size and/or opposite in direction. If the forces on an object are UNBALANCED, we say a NET force results.
What is a Force?
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Determine the NET FORCE:
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