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Motion
Motivational Poster #1
Applying physics principles
How do you KNOW something moved?
• Frame of reference the background or object used for comparison. All movement is described relative to a frame of reference.
• Ex: a train takes off with you in it. To the people watching on the ground, it is the Earth. To you, it is the train.
• The most common frame of reference is the earth.
What is the frame of reference?
How do we seethe bullet going through the lemon?
Motivational Poster #2
Measuring Motion• Motion – a change in
position in a certain amount of time.
• Speed – the rate at which an object moves.
• Speed = Distance/Time
• Speed is measured m/sec or km/hr
Which animal is the fastest?
Let’s Practice…
1.At what speed did a plane fly if it traveled 150 m in 5 seconds?
2. At what speed did a boy run if he went 2 km in 20 min?
3. At what speed did a bird fly if he went from one tree to another (35 m) in 7 seconds?
Motivational Poster #3
Types of Speed• Constant speed: when the speed of an object
does not change. The graph is always a straight line.
• Average speed: describes the speed of motion when speed is changing; graph is a jagged line.
• Velocity – a speed in a given direction. – Ex: Speed 10m/sec
Velocity 10m/sec east
Constant speed
Average Speed
Where do you use this information?
Why is Velocity important toPilots?
Combining Velocities
• Rowing downstream 16 km/hr• Water 10 km/hr__+__________________________
26km/hr
Rowing upstream 16km/hr Water 10 km/hr_--__________________________ 6 km/hr
Motivational Poster #4
Tying it all together…
Acceleration• Acceleration – the rate of change in velocity; an
object accelerates if its speed, direction or both change
• Final velocity - original velocity Time
Ex: A car is traveling at 60 km/hr. It accelerates to 85 km/hr in 5 hrs. What is the rate of acceleration?
V(final) – V(original) t
85 – 60 = 5 km/hr/hr 5*If the acceleration is negative than the object is decelerating
(slowing down).
Graphing Acceleration
Acceleration
Deceleration
Calculating Speed
Motivational Poster #5
Motion Continued…• Momentum – depends on the
mass and velocity with which it is traveling.
• Momentum = mass x velocity• Ex: What is the momentum of a
5 kg blue-jay flying at 10 m/sec?• M = mv• M = 5 kg x 10 m/s• M = 50 kg/m/s
Transfer of Momentum
Momentum Example:
Motivational Poster #6
How can you use all this information?
Wait! Before you go…one more!
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