Sage-Tips

Can two cars moving at the same speed have different velocities?

Objects have the same velocity only if they are moving at the same speed and in the same direction. Objects moving at different speeds, in different directions, or both have different velocities. They represent objects that have different velocities only because they are moving in different directions.

Is speed the same for different cars?

Unless you have a faulty speedometer, it’s the same in all cars, when the speedo shows 80mph, no matter what car you drive you’ll reach 80 miles in an hour.

When a person is driving a car that is moving at the same speed as another car next to it why does the second car appear to be still?

By definition, velocity refers to how fast a car moves towards a particular direction. So, if two cars move with the same speed towards different direction, they are moving with different velocities.

Can a car with less horsepower be faster than a car with more horsepower?

Horsepower vs. If you drive a compact sedan and a large sedan with the same horsepower rating, the compact will be quicker because it is lighter. Torque is another engine spec the affects a car’s performance.

Can two objects have the same acceleration but different speeds?

The acceleration due to gravity is about 10 m/s2 everywhere around earth, so all objects experience the same acceleration when they fall. Acceleration is the change in speed in a second, so if all objects have the same acceleration, they experience the same change in speed.

Why can a car accelerate while traveling at constant speed but not at constant velocity?

An object’s acceleration is the rate its velocity (speed and direction) changes. Therefore, an object can accelerate even if its speed is constant – if its direction changes. If an object’s velocity is constant, however, its acceleration will be zero. Since it travels in a straight line, its direction does not change.

Does more BHP mean more speed?

BHP is pretty much the power of an engine in simple terms. The Brake Horse Power is the unit of power of an engine without any losses like heat and noise. The BHP determines the acceleration and top speed of a vehicle. Often fast and quick vehicles will focus more on the BHP than the torque.

When two cars collide the forces that act upon them are equal but opposite what about their acceleration?

In a collision, there is a force on both objects that causes an acceleration of both objects; the forces are equal in magnitude and opposite in direction. For collisions between equal-mass objects, each object experiences the same acceleration.

How much horsepower does it take to drive a car?

When traveling on level roads at constant speed, most passenger cars need only about 20 hp or so to overcome rolling friction and air drag. (More power would be needed, obviously, if you were carrying a door on top of your car, with the flat side perpendicular to the line of travel. That’s a good estimate.

Why does a car need more power at high speeds?

(More power would be needed, obviously, if you were carrying a door on top of your car, with the flat side perpendicular to the line of travel. The power required to overcome rolling friction is pretty constant regardless of vehicle speed, but the force produced by air drag is proportional to the square of the speed of the car.

How much more drag is created at 60 mph than 30?

So, there is 4 times as much air drag created at 60 mph as there is created at 30 mph. All of that extra power capability in a car’s engine is put there to drive things like the alternator, power steering, auto trans, etc. and to allow one to accelerate from standing still to cruising speed without taking all day.

How many times does a car’s speed increase its Ke?

When the car’s speed is increased from 50 km/h to 150 km/h, its KE is increased by nine times! Remember that KE is given by KE = (1/2) m v2 so increasing v by threemeans that KE increases by nine.