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8.4 Moving About

NSW Board of Studies Preliminary Physics Course Material Created by Peter Robson.

Peter Robson

on 20 September 2010

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Transcript of 8.4 Moving About

MOVING ABOUT Week 1 Vehicles do not typically travel at a constant speed Week 2 1.1
Identify that a typical journey involves speed change 1.2
Distinguish between the instantaneous and average speed of vehicles and other bodies 1.3
Distinguish between scalar and vector quantities in equations 1.5
Compare instantaneous and average speed with instantaneous and average velocity 1.4
Define average velocity as: 1.6
solve problems and analyse information using the formula : Consider your normal trip to school of a morning. There will be times when the vehicle you are in is stationary and other times when it is travelling at a certain speed. Even the speed that the vehicle is travelling at will vary depending on the road conditions. Identify three different situations where your speed changes. Average Speed:
The average speed of an object can be found by dividing the total distance travelled by the total time taken.

Instantaneous Speed:
The instantaneous speed of an object is its speed at a particular instant in time. A car’s speedometer displays the instantaneous speed of the car. What is the average speed that you travel at to get to school? Scalar quantity:
A measurement which is fully described by a magnitude alone. E.g. Temperature

Vector quantity:
A measurement which is fully described by both a magnitude and a direction. E.g. Force Consider the following equation representing Newton’s Second Law F=ma
Force = mass x acceleration

Force and acceleration are vector quantities.
Mass is a scalar quantity. Identify two more scalar quantities
Identify two more vector quantities The average velocity (v ) can be found by dividing the change in position (displacement) ( r) by the change in time ( t)

av V V _ _ What is the unit for average velocity? UNDER CONSTRUCTION
CHECK BACK LATER! Vehicles do not typically travel at a constant speed 1.7
solve problems and analyse information using the formula : An analysis of the external forces on vehicles helps to understand the effects of acceleration and deceleration At 11:20am, an aeroplane passed over a town 40km east of Canberra. At 1:35pm, the aeroplane was 600km west of Canberra. Canberra 40 km 600km 11:20 am 1:35 pm Change in displacement.
r = 40+600
r = 640km > _ _ > Change in time.
t = 40min + 1h + 35min
t = 2h15min or 2.25h _ > > _ > _ Average velocity.
v = 640/2.25
v = 284km/h West av av 2.1
Describe the motion of one body relative to another. 2.2
Identify the usefulness of using vector diagrams to assist in solving problems. 2.3
Explain the need for a net external force to act in order to change the velocity of an object. 2.4
Describe the actions that must be taken for a vehicle to change direction, speed up and slow down. 2.5
Describe the typical effects of external forces on bodies including friction and air resistance. 2.6
Analyse the effects of external forces operating on a vehicle. 2.7
Define average acceleration as: 2.8
Define the terms mass weight with reference to the effects of gravity. 2.9
Outline the forces involved in causing a change in the velocity of a vehicle in varoius situations. MAKE SURE YOU USE THE CORRECT UNITS TOOLS 1.8
Graph displacement vs. time data for objects with uniform and non-uniform linear velocity. Present graphically velocity vs. time data for objects with uniform and non-uniform linear velocity. This will be covered more at the next workshop day Which Train is moving? How can you tell?
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