#1
Which of the following best describes the principle of conservation of mechanical energy in an isolated system?
The total mechanical energy remains constant
ExplanationMechanical energy is conserved in an isolated system, remaining constant.
#2
In a frictionless environment, a ball is thrown upwards. At its highest point, which form of energy is at its maximum?
Potential energy
ExplanationIn a frictionless environment, at the highest point, a ball has maximum potential energy.
#3
A skier at the top of a mountain has potential energy. As the skier descends and picks up speed, what happens to the skier's potential and kinetic energy?
Potential energy decreases while kinetic energy increases
ExplanationDescending, a skier's potential energy decreases while kinetic energy increases.
#4
What role does the mass of an object play in the conservation of mechanical energy in a gravitational field?
Mass has no impact on mechanical energy conservation
ExplanationThe mass of an object has no impact on the conservation of mechanical energy in a gravitational field.
#5
A roller coaster at the top of a hill has a certain amount of potential energy. If friction is ignored, what happens to this energy as it moves down the hill?
It is converted into kinetic energy
ExplanationPotential energy is converted into kinetic energy as the roller coaster moves down the hill, neglecting friction.
#6
In a pendulum swing, where is the speed of the pendulum the greatest?
At the lowest point of its swing
ExplanationThe speed of a pendulum is greatest at the lowest point of its swing due to maximum kinetic energy.
#7
What happens to the total mechanical energy of a system when non-conservative forces, like friction, are present?
It decreases due to the conversion of some mechanical energy into thermal energy
ExplanationNon-conservative forces, like friction, cause a decrease in total mechanical energy by converting some into thermal energy.
#8
Which of the following scenarios illustrates the conservation of mechanical energy in a closed system?
A satellite orbiting Earth in space
ExplanationA satellite orbiting Earth in space illustrates the conservation of mechanical energy in a closed system.
#9
A block attached to a spring is compressed and then released. How does the mechanical energy change during this process if no energy is lost to friction?
Potential energy is converted into kinetic energy, then back into potential energy, conserving mechanical energy throughout the process
ExplanationIn the absence of friction, a block's potential energy is converted to kinetic energy and vice versa, conserving mechanical energy.
#10
A satellite in orbit around Earth experiences gravitational potential energy. What happens to this potential energy as the satellite continues its orbit?
It remains constant throughout the orbit
ExplanationGravitational potential energy of a satellite remains constant throughout its orbit.
#11
Considering a system where a block slides down a frictionless inclined plane, which of the following statements accurately reflects the conservation of mechanical energy?
The kinetic energy of the block increases while its potential energy decreases, with the total mechanical energy remaining constant
ExplanationIn a frictionless system, as a block slides down, kinetic energy increases, potential energy decreases, and total mechanical energy remains constant.
#12
In a perfectly elastic collision between two objects, which of the following statements is true regarding the system's mechanical energy?
It remains constant, conserving both kinetic and potential energy
ExplanationIn a perfectly elastic collision, the system's mechanical energy remains constant, conserving both kinetic and potential energy.
#13
In a system where a spring-mass system undergoes simple harmonic motion, what happens to the mechanical energy over time?
It remains constant because of the conservation of mechanical energy
ExplanationIn simple harmonic motion, mechanical energy remains constant due to the conservation of mechanical energy.
#14
If an external force is applied to a system in motion, how does this affect the conservation of mechanical energy?
It violates the conservation of mechanical energy principle
ExplanationApplication of an external force violates the conservation of mechanical energy principle.
#15
In a system with energy dissipation, such as air resistance, what happens to the mechanical energy over time?
It decreases as energy is lost to external forces
ExplanationIn a system with energy dissipation, mechanical energy decreases over time as energy is lost to external forces like air resistance.
#16
In a perfectly inelastic collision between two objects, what can be said about the conservation of mechanical energy?
It is not conserved due to energy lost in the collision
ExplanationIn a perfectly inelastic collision, mechanical energy is not conserved due to energy lost in the collision.