Motion. Motivational Poster #1 Applying physics principles.

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Presentation transcript:

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 see the 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 to Pilots?

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!