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what matter changes are occurring inside the system (the car)? what evidence do you see of energy transfer into and out of the system (the car)? where are forces being applied, and how?
6 (the tires) because thats what moves the car forces being applied on them from the whole engine and transmission
1 (engine) the burning fuel creates pressure of expanding gases in the cylindrical that pushes the engine which apply pressure on the wheels
7 (suspension) the reason why i say suspension is due to the fact of suspension is creating a energy movement, which is also known in scientifical ways as kinetic energy it moves the car forward, but keeps it from going up and down too much.
the radiator which connects to the engine working together it is able to produce steam and cool off the car
i think the engine (1) is causing the energy to transfer to the rest of the system i think this because you
i think (1) because its what gets the wheels moving
fuel burns in the engine (1) creates energy that moves the car forward.
Matter Changes Inside the Car (System):
- Engine: Combustion of fuel (a chemical change) occurs. Fuel (like gasoline, a hydrocarbon) reacts with oxygen, producing carbon dioxide, water vapor, and energy (heat and mechanical energy). This is a chemical change as new substances (CO₂, H₂O) are formed.
- Tires: If the car is moving, tires experience friction with the road. The rubber of tires may undergo slight physical changes (like deformation) due to the force from the road and the weight of the car, but no new substance is formed (physical change, e.g., elastic deformation).
- Radiator: The coolant (usually a liquid like water - based antifreeze) circulates. When the engine is hot, the coolant absorbs heat (physical change: liquid coolant may vaporize slightly, then condense as it cools in the radiator, releasing heat to the air outside the car).
Energy Transfer (Into and Out of the Car):
- Into the System (Car):
- Fuel: Chemical energy stored in the fuel (gasoline) is the primary energy input. When fuel burns in the engine, chemical energy is converted to thermal energy (heat) and then to mechanical energy (to move the car).
- External Forces (Indirect Energy): For example, if the car is being pushed (though less common in a running car), the force from a person pushing transfers mechanical energy to the car. But mainly, the fuel provides the internal energy source.
- Out of the System (Car):
- Mechanical Energy (Motion): The car’s kinetic energy (energy of motion) is transferred to the surroundings as it moves (e.g., sound energy from the engine and tires, heat energy from the engine and exhaust, and work done against air resistance and road friction).
- Heat from Radiator: The heat absorbed by the coolant in the engine is transferred to the air outside the car via the radiator. The hot coolant releases heat to the cooler air, so thermal energy moves from the car (engine/coolant) to the environment.
- Exhaust Gases: The hot exhaust gases (from fuel combustion) carry thermal energy and chemical by - products (like CO₂, unburnt hydrocarbons) out of the car, transferring thermal energy to the surrounding air.
Forces Applied and How:
- Engine - Related Forces:
- Inside the engine, the expanding gases from fuel combustion exert a force on the pistons (pressure force). This force is transferred via the crankshaft and transmission to the wheels.
- Wheel - Related Forces:
- The force from the engine (transmitted to the wheels) makes the wheels push backward on the road (Newton’s third law: action - reaction). The road then exerts a forward - directed frictional force (static friction, if the tires don’t slip) on the wheels. This is the driving force that moves the car forward.
- The weight of the car (force due to gravity, \( F = mg \), where \( m \) is the mass of the car and \( g \) is acceleration due to gravity) acts downward on the wheels, tires, and the entire car. The road exerts an upward normal force on the tires, balancing the weight (Newton’s first law in the vertical direction, for a car moving at constant speed or not accelerating vertically).
- Suspension - Related Forces:
- The suspension system (springs, shock absorbers) exerts forces to counteract the weight of the car and the forces from bumps in the road. For example, when the car hits a bump, the suspension compresses (the spring in the suspension is compressed, exerting an upward force to push the car back up, reducing the impact on the car’s body).
- Frictional fo…
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Matter Changes:
- Inside the car: Chemical change (fuel combustion in engine, new substances like \( \ce{CO_2} \) and \( \ce{H_2O} \) formed); physical changes (coolant vaporization/condensation in radiator, tire deformation).
- Evidence of energy transfer:
- Into the car: Chemical energy from fuel is converted to thermal/mechanical energy (engine motion, tire rotation).
- Out of the car: Thermal energy (radiator heat, exhaust heat), sound energy (engine/tires), and energy lost to friction (road - tire, air - car).
- Forces applied:
- Engine: Expanding gases push pistons (pressure force).
- Wheels: Road exerts forward friction (reaction to wheel’s backward push); weight (gravity) and road’s upward normal force act on wheels.
- Suspension: Springs/shock absorbers exert force to dampen motion (e.g., from bumps).
- Brakes: Frictional force between pads and rotors slows wheels.
- Air: Drag force opposes motion.