Solving Car Problem: Acceleration, Coasting and Deceleration

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In summary, a car weighing 1000 kg is accelerated at 3 m/sec^2. The force required to produce that acceleration is 3000 N. After 45 seconds, the car coasts for 20 minutes and does not experience any net forces. The car has kinetic energy at the end of the 20 minutes, but it dissipates after it stops.
  • #1
ataglance05
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This problem is in various questions, so please bear with me.

Homework Statement


a) A car weighing 1000 kg is accelerated at 3 m/sec^2. What is the force required to produce that acceleration?.

b) in problem a- the car is accelerated for 45 seconds. How fast in m/sec is it going at the end of 45 sec?

c) in problem b- after the initial 45 second acceleration period, the car coasts (no net forces) for 20 minutes. ca) How fast is it going at the end of 20 minutes? How far did it go in hat 20 mintues?
cb) How much work was done on the car in that 20 minutes?
cc)At the end of the 20 minute coast period, the car is decelerated to a stop. How much work was done to bring the car to a stop?
cd)If the car took 35 seconds to stop, what was the force on the car and how far did it travel in the meters before it stopped

Homework Equations


a) F=ma
b) Vf(final velocity)= Vo(initial velocity) + a(acceleration)T(time)
c) F=ma or Vf=Vo+aT or S(distance)=VoT+ 1/2(a)(T^2) or W(work)=(F)D
(D is distance)

The Attempt at a Solution


a) F=ma
F=1000kg(3 m/sec^2)
F=3000 N

b) Vf=Vo+aT
Vf=0+3 m/sec^2(45 sec)
Vf=135 m/sec

c)PLEASE HELP!
 
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  • #2
ca) coasting means what about its speed? If you know how fast it was going for the 20 minutes...how far did it cover?

cb) What is the definition of work? Can you do work if F=0?

cc) What can you say about the kinetic energy of the car as it goes from 135m/s to 0m/s? Where did that energy go?

cd) Re-use the technique you used in 3a.
 
  • #3
berkeman said:
ca) coasting means what about its speed? If you know how fast it was going for the 20 minutes...how far did it cover?

cb) What is the definition of work? Can you do work if F=0?

cc) What can you say about the kinetic energy of the car as it goes from 135m/s to 0m/s? Where did that energy go?

cd) Re-use the technique you used in 3a.

ca) coasting means that the speed stayed the same throughout the 20 minutes?

cb) Work is the exertion or effort directed to produce or accomplish something. I guess that one can not do work if there is no force. I still don't postulate how this answers the question.

cc) The kinetic energy stops being present? The energy just dissipated.

cd) Reusing the formula F=ma would mean that I would have to multiply 1000kg by the acceleration of the car which I really do not know what it is.

I am very perplexed!@!#!
 

Related to Solving Car Problem: Acceleration, Coasting and Deceleration

What causes a car to have difficulty accelerating?

There are several potential causes for a car to have difficulty accelerating. These can include a clogged air filter, a faulty fuel pump, a malfunctioning mass airflow sensor, or a problem with the spark plugs or ignition system. It is best to have a mechanic diagnose the issue to determine the exact cause.

How can I improve my car's acceleration?

To improve a car's acceleration, regular maintenance is key. This includes keeping up with oil changes, replacing air and fuel filters, and ensuring spark plugs are in good condition. Additionally, upgrading to a performance air filter or exhaust system can also improve acceleration.

Why does a car coast when I take my foot off the gas?

Coasting is a natural process that occurs when a car is not being accelerated or decelerated. When you take your foot off the gas, the engine stops providing power to the wheels, and the car begins to decelerate due to air resistance and friction from the tires. This allows the car to maintain its speed without using any additional fuel.

What causes a car to decelerate or slow down?

A car can decelerate or slow down for various reasons. These can include applying the brakes, taking your foot off the gas, driving uphill, or encountering increased air resistance due to wind or a rough road surface. In some cases, a mechanical issue such as a faulty brake system or transmission can also cause a car to decelerate.

How do I know if my car's acceleration is abnormal?

If your car's acceleration feels significantly slower or weaker than usual, or if you notice any strange noises or vibrations while accelerating, it may be a sign of a mechanical issue. It is best to have a mechanic inspect your car to determine the cause of the abnormal acceleration and address any potential problems.

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