Inertia 2 rules of inertia –1. objects move in a straight line unless some force is put upon them...

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Transcript of Inertia 2 rules of inertia –1. objects move in a straight line unless some force is put upon them...

Page 1: Inertia 2 rules of inertia –1. objects move in a straight line unless some force is put upon them –2. objects at rest stay at rest.
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Inertia

• 2 rules of inertia– 1. objects move in a straight line unless some

force is put upon them– 2. objects at rest stay at rest.

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The force that pulls objects to the center of the earth.

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Uphill

Must increase speed because gravity works against you.

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Going Up HillGravityHave to hit gas to get uphill

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Downhill

Must decrease speed because gravity works with you.

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Going Downhill

Gravity working with you; have to slow down or risk losing control

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The point around which an object’s weight is evenly balanced.

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--The energy an object has as a result of motion.-- It is the actual force created by movement.

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Two factors that affect energy of motion.

SPEED WEIGHT

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The higher the SPEED andWEIGHT the more energyof motion.

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Which has the greatesteffect?

SPEED

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• Force between 2 surfaces that resists the movement of one surface against the other.

• Examples---– Socks on carpet versus socks on waxed floor.

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The friction, or grippingaction, between the roadway and tire.

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Tread

The grooved surface of a tire that grips the roadway.

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Factors that Affect Tire Condition

• There are 4 factors that affect tire condition and, more importantly, its ability.

• 1. Condition

• 2. Rain

• Snow/Ice

• Road Conditions—potholes, construction, etc.

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Purpose

To remove water from in front of the tire.

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Over inflation

Only center of the tire will grip the road properly.

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Under inflation

Only the edges of the tire will grip the road properly.

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Proper inflation

The tire grips the road evenly and causes even tread wear.

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Proper Tire Inflation

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Straight line

All traction is used to slowdown or speed up the vehicle.

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Slowing/Turning

Some traction is used to slow.

Most traction is used to turn.

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Turning/AcceleratingMost traction is used to turn.

Some traction is used to accelerate.

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Two forces that work on a vehicle in a curve.

Energy of motionTraction

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Energy of motionThe energy of motion in your vehicle will try to make it go in a straight line.

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Traction

If traction limit is exceeded in curve, vehicle will begin to skid.

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4 factors to negotiate curvesSpeed

SharpnessLoad

Banked curves

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Speed

Slow for turnsbefore the turn.

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The sharper the turn, the slower the car. Right turns are sharper than lefts.

Sharpness

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The heavier the vehicle the slower it must travel.

Load

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Banked Curves

Curves that are higher onthe outside than on theinside.

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The time/distance it takes a driver to identify a hazardand come to a complete stop.________________________________________________________________________________________________________

PerceptionReaction

Braking

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The time and distance it takesa driver to identify, predict, and decide to slow for a hazard.

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The time/distance it takes adriver to react to a hazard.

Average reaction time=

¾ of a second

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The time/distance your vehicletravels from the time the brakesare applied until you stop.

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Stopping Distance

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The force at which a movingobject hits another object.

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Momentum

• A vehicle’s momentum(how fast/slow an object is moving) is determined by its’ weight and speed.

• Higher Momentum = More Damage

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SpeedWeight

Distance between impactand stop

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The faster the speed, the greater the force

of impact.

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Adjusting speed to Highway Conditions

• 3 situations in which you should change your speed(SLOWER):– 1. Visibility decreases– 2. Traction decreases– 3. Loss of space around your car.

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When you should adjust

• Location of other vehicles—if you lose space around any part of your car, you may need to speed up or slow down.

• If you break the safe following distance(which is 2 car lengths or 2-4 seconds)

• Always SPEED UP when changing lanes.

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The heavier the vehicle, thegreater the force of impact.

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The shorter the distance, the greater the

force of impact.

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1. Vehicle hitting an object.2. Occupants hitting something inside the vehicle.

* Object inside vehicle hitting occupants.

3. Organs hitting body cavity.

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Hold occupants in place during collision.

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A restraint device the occupant must put on themselves.

Ex.- Seatbelt

Active Restraint

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A restraint device that works automatically.

Ex.- Air bags

Passive Restraint

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Seatbelt Law

Click it orTicket


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