Answer and Explanation: The
kinetic energy changes more
if the car goes from 15 m/s to 20 m/s.
Does the kinetic energy of a car change more when it speeds up from 10 to 15 m per second or from 15 to 20 m per second?
Answer and Explanation: The
kinetic energy changes more
if the car goes from 15 m/s to 20 m/s.
How does a car’s kinetic energy change when it speeds up from 10 to 20 m/s How does a car’s kinetic energy change when it speeds up from 10 to 20 m s?
When a car’s speed increases from 10 m/s to 20 m/s, the
kinetic energy increases by a factor of four
.
Does the KE of a car change more when it goes from 10 to 20?
Does the KE of a car change more when it goes from 10 to 20 km/h or when it goes from 20 to 30 km/h? … j So
KE changes more for a given change in velocity at the higher speed
. Ex #51.
What happens to kinetic energy when speed increases?
It turns out that an
object’s kinetic energy increases as the square of its speed
. A car moving 40 mph has four times as much kinetic energy as one moving 20 mph, while at 60 mph a car carries nine times as much kinetic energy as at 20 mph. Thus a modest increase in speed can cause a large increase in kinetic energy.
Can the total work done on an object during a displacement be negative?
The relation specifies that the total work done on the particle by all the forces is equal to the change in the kinetic energy of the particle. The total work done on an object during a displacement can be
negative if
.
Is a head on collision between two cars more damaging to the occupants?
In general, bounce after impact produce great impulse as there is great change in momentum takes place than the impact when cars stick together. Thus, a
rebounding collision
contributes greater impulse and hence creates more damage as compared to the collision in which cars stick together.
Why are padded dashboards safer in automobiles?
Padded dashboards make automobiles safer because
they increase the time taken to decrease the momentum of an impacting body to zero
, which decreases the impact. Thus, the force acting on the padded dashboards is small.
Does a car burn more fuel when it’s lights are on does the overall consumption of fuel depend on whether the engine is running while the lights are on discuss and defend your answers?
form of energy and that energy is provided by the burning of gasoline. The overall consumption of gasoline
does not depend on whether
or not the engine is running while the lights are on. This is because the energy consumed by the battery when the engine is not running is restored when the engine runs.
What factor contributes most to kinetic energy of body in motion?
The two main factors that affect kinetic energy are
mass and speed
. Why? Because the motion of an object depends on how fast it’s traveling, but also how much mass it has, though velocity is the more important factor.
What will be the new kinetic energy of a body if its velocity is doubled?
If the velocity is doubled its kinetic energy is
multiplied by four times
. And there is no relationship between the velocity and potential energy. So, if the velocity is doubled, momentum also doubles.
What factors does the kinetic energy of a body depend on?
The total kinetic energy of an object depends on several factors, such as the amount of work done on an object and its acceleration after a moment of inertia from external forces. The most important factors that determine kinetic energy are the
motion (measured as velocity) and the mass of the object in question
.
In which case is negative work done?
5 Answers.
Whenever a given force and displacement produced by that force has an angle >90 degrees
,the work done is said to be negative. Since by the definition of work done,W= F.s = Fs cos(angle between f and s),thus whenever angle is >90, cos(angle) is negative and hence work done is negative.
What is negative work done with example?
Negative work is performed if the displacement is opposite to the direction of the Force applied. Example:
Work was done the gravity on a rocket going perpendicular upwards.
Can we make positive work negative by a different choice of coordinates?
It doesn’t matter what you choose as a coordinate system,
only that you explicitly choose one
. Depending on the coordinate system chosen, the position of an object can be positive, negative, or zero.
During which type of collision do the two objects stick together?
| Term (symbol) Meaning | Inelastic collision Collision which conserves momentum but not kinetic energy. | Totally inelastic collision Collision where the objects stick together and have the same final velocity. Also called a perfectly inelastic collision. |
|---|
