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When a car moves along the highway at constant velocity the net force is zero why then do you continue to run your engine?
Wiki User
∙ 14y ago
The key point is that the net force is zero. This is not the same as having zero force acting on it. The forces of drag and friction are always acting on moving objects, and the engine generates a force through the wheels that balances out this force, keeping you at a constant velocity. If the engine was stopped, this counterforce would no longer be in effect, and the unbalanced force of the drag would eventually slow the car to a stop.
Wiki User
∙ 14y ago
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Why an object moves with uniform speed even if the two forces acting on it in opposite directions are equal?
It is not "in spite of" it is because of. The action of the object (e.g. thrust of engine, waving of arms or legs) generates an oppositely directed reaction, causing the object to move in the other direction.
What is exhaust velocity?
The velocity of gaseous or other particles in the exhaust stream of the nozzle of a reaction engine, relative to the nozzle.
Will two cars of different engine capacities maintain the same momentum if driving at the same speed?
Momentum is velocity times mass, so, in order for two cars to have the same momentum at the same velocity, they must have the same mass. Engine capacity has nothing do do with the equation.
What are the forces on a car?
forward velocity, provided by the engine turning the wheels air resistance, slowing the car down due to it colliding with air molecules friction, slowed by the friction of the tyres with the road any other forces are not constant during motion of the car ( e.g gravity up or down a hill)
When your car moves along the highway at a constant velocity the net force on it is zero Why then do you continue running your engine?
there is resistance from the brake pads constantly rubbing on the rotors and the bearings still cause a little resistance and your car is going against air and any air conditioning or heating is run by the engine and the net force is not zero 2nd Answer: We're still missing the point, here. Forget brakes, air conditioning, etc. Let's say that the engine propels the car down the road at a constant speed by applying, oh, let's say, +200 pounds. Let's also say that the air friction, tire friction and so forth apply a force the opposite way, trying to prevent the car moving down the road. Let's call this -200 pounds. So, +200 lbs and -200 pounds = zero, right? This is the NET force, meaning that all the forces in different directions are all added and subtracted. Zero net force exists as long as the car travels at a constant speed. If you want to slow down, you let off some of the engine's force (lifting the gas pedal) and add more to the friction forces. (Apply brakes). To increase speed (you can't take away any friction forces), simply add force to the engine propelling the car by pressing on the gas pedal. In either the slowing or the speeding up cases, the NET force is no longer zero, but more negative, or more positive, respectively.
How late did GM continue to produce the 305 engine?
2003 for highway applications. It's still in production as a boat engine for Mercury Marine.
When velocity will be constant what will be the energy?
Kinetic energy will be constant, but total energy (KE+PE) might not be. If the car, say, is climbing a hill at a steady speed, its KE is constant, but the work done by the engine is being used to increase PE.
What is the mileage highway for the Ford Fusion?
2.3L Hybird I-4 Engine 36mpg highway 2.3L I-4 Gas Engine 34mpg highway 3.0L V6 Gas Engine 25mpg highway 3.5L V6 Gas Engine 25mpg highway
Where is the PCV valve located on a 1997 Civic?
Probably next to the oil filter UNDER the engine on drivers side ABOVE the constant velocity axle. You'll need a flashlight.
Will it hurt engine to drive in low on highway?
At highway speeds, YES!
What is the mpg for a 2002 Ford Explorer?
4.0L V6 engine - - - 16mpg city / 21mpg highway 4.6L V8 engine - - - 15mpg city / 20mpg highway 5.0L V8 engine - - - 12mpg city / 16mpg highway
Determine the net force on a car moving in a straight line at constant speed?
If traveling at constant speed in a constant direction then net force is zero as there is no acceleration. Acceleration would change one or the other, or both. F = ma = m (0) = 0
Why do you need to continue running your engine when your car moves along the highway at a constant velocity and the net force on it is zero?
Air and road friction constantly resist and retard a car's forward momentum, as do inclines. Some level of constant thrust is needed to countermand their effects to enable a ground vehicle to move forward at a constant speed. The reason airplanes and magnetically levitated trains are able to achieve much faster speeds than ground vehicles is they do not have to contend with friction between wheel and a road (or rail with a train). Although it impedes fuel/power efficiency, cars need a degree of road friction to enable acceleration and control (since a car's acceleration is dependent on the tires gripping the road and pulling it forward). Cars with smooth tires have less road friction, so they would require less energy to maintain a given velocity but are more difficult to alter their momentum (in any of accelerating, turning or decelerating).
Why are you constantly breaking your constant velocity shafts?
Defective parts? Improper installation? Improper operation of vehicle? Check for a loose or broken engine mount. Vehicle has been raised or lowered from stock position.
What is mpg for ford explorers?
4.0L V6 Engine - - - 21mpg highway, 16mpg city 4.6L V8 Engine - - - 20mpg highway, 15mpg city 5.0L V8 Engine - - - 17mpg highway, 13mpg city (no longer produced) The 4.0L V6 engine and the 4.6L V8 engine were EPA fuel estimates.
Why an object moves with uniform speed even if the two forces acting on it in opposite directions are equal?
It is not "in spite of" it is because of. The action of the object (e.g. thrust of engine, waving of arms or legs) generates an oppositely directed reaction, causing the object to move in the other direction.
When your car moves along the highway at a constant velocity the net force is 0 why then do you continue running your engine?
When moving at a constant speed or velocity, the vehicle is no longer accelerating, however there is still resistance to motion mostly from friction. The largest factors are wind resistance and road friction. It causes drag and is constantly trying to slow the car down, requiring some degree of constant power, so the net force is never truly zero. If we could eliminate wind resistance, by let's say driving with a tail wind exactly the same speed as our forward velocity - making wind resistance zero - the power required to maintain velocity would be much less. However, there would still be drag from friction between the road and tires. Friction from moving parts inside the engine, transmission and drive axles as well as rolling resistance from the tires. Tires have treads to actually generate resistance, as the resistance they provide are required for changes in momentum essential to basic motoring -- accelerating, turning and decelerating (braking/slowing). A car with no road resistance in its tires would be able to maintain a given velocity with a lot less power, but would be impossible to grip the road to accelerate to that velocity, and would be unable to turn or slow down unless they struck another object. There is no way to eliminate the need for power at a constant speed, but there are many things we can do to reduce the amount of power we need. Speed limits were put in place to increase fuel efficiency - the national 55 limit arose from a concern about fuel consumption. The design of modern cars takes aerodynamics into consideration to reduce drag caused by wind resistance. There are also steps drivers can take, like making certain your tires are properly inflated, and changing air filters and oil regularly. These all contribute to making the vehicle as efficient as possible.
