Physics
In which of the following scenarios is work done?
A car decelerates while traveling on a flat stretch of road.
Potential energy is
stored energy.
If an egg drops on the floor and breaks,
the egg is still an egg and still has as much energy as it did before it broke, even though it is in a different form.
Gravitational potential energy
the energy associated with an object due to the object's positions relative to gravity.
Kinetic Energy
the energy of an object that is due to the object's motion.
Work
the product of the component of a force along the direction of distance of displacement and the magnitude of the displacement.
If you push your car with a constant horizontal force,
the work you do on the car is equal to the force, times the displacement of the car.
Objection in motion have kinetic energy because of
their mass and speed.
Work is
done on an object when a force causes a displacement of the object.
What form of energy is involved in weighing fruit on a spring scale?
elastic potential energy
For which of the following situations is the conservation of mechanical energy most likely to be a valid assumption?
A soccer ball flies through the air.
In which of the following sentences is work used in the scientific sense of the word?
Sam and Rachel pushed hard, but they could do no work on the car.
Which of the following energy forms is NOT involved in hitting a tennis ball?
Chemical potential energy
Which of the following refers to the sum of kinetic energy and all forms of potential energy?
Mechanical energy
Which of the following energy forms is associated with an object due to its position?
Potential energy
Mechanical Energy
The sum of kinetic energy and all forms of potential energy.
Which of the following is a true statement about the conservation of energy?
Total energy is always conserved.
Potential energy
is associated with an object that has the potential to move because of its position, shape, or condition of the object.
Elastic potential energy
is energy stored in any compressed or stretched object.
The main difference between kinetic energy and potential energy is that
kinetic energy involves motion, and potential energy involves position.
Which of the following are examples of conservable quantities?
mechanical energy and mass
In the absence of friction,
mechanical energy is conserved, so the amount of mechanical energy remains constant.
Gravitational potential energy depends
on the object's height from a zero level.
