#1
Which of the following best describes the principle of conservation of mechanical energy in an isolated system?
The total mechanical energy increases over time
The total mechanical energy decreases over time
The total mechanical energy remains constant
The total mechanical energy alternates between potential and kinetic energy
#2
In a frictionless environment, a ball is thrown upwards. At its highest point, which form of energy is at its maximum?
Kinetic energy
Thermal energy
Potential energy
Chemical 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 increases while kinetic energy decreases
Potential energy decreases while kinetic energy increases
Both potential and kinetic energy increase
Both potential and kinetic energy remain constant
#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
Heavier objects conserve mechanical energy better
Lighter objects conserve mechanical energy better
Mass influences only kinetic energy, not potential energy
#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 thermal energy
It is converted into kinetic energy
It remains constant as potential energy
It is lost to the atmosphere
#6
In a pendulum swing, where is the speed of the pendulum the greatest?
At the highest point of its swing
At the lowest point of its swing
At the midpoint of its swing
The speed is constant throughout its swing
#7
What happens to the total mechanical energy of a system when non-conservative forces, like friction, are present?
It remains constant because energy cannot be created or destroyed
It increases due to the addition of thermal energy
It decreases due to the conversion of some mechanical energy into thermal energy
It oscillates between potential and kinetic energy without loss
#8
Which of the following scenarios illustrates the conservation of mechanical energy in a closed system?
A car accelerating on a flat road with its engine running
A book falling off a table onto the ground
A satellite orbiting Earth in space
Water flowing from a high waterfall
#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
Kinetic energy is converted into potential energy, decreasing the total mechanical energy
Potential energy is converted into kinetic energy, increasing the total mechanical energy
Mechanical energy is lost as heat due to compression and expansion
#10
A satellite in orbit around Earth experiences gravitational potential energy. What happens to this potential energy as the satellite continues its orbit?
It decreases as the satellite moves away from Earth
It remains constant throughout the orbit
It increases as the satellite moves closer to Earth
It is converted into kinetic energy as the satellite gains speed
#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 potential energy of the block decreases while its kinetic energy remains constant
The kinetic energy of the block increases while its potential energy decreases, with the total mechanical energy remaining constant
The potential energy of the block increases while its kinetic energy decreases
The total mechanical energy of the block decreases due to energy lost to friction
#12
In a perfectly elastic collision between two objects, which of the following statements is true regarding the system's mechanical energy?
It is completely converted into thermal energy
It is not conserved due to external forces
It remains constant, conserving both kinetic and potential energy
It increases as a result of the collision
#13
In a system where a spring-mass system undergoes simple harmonic motion, what happens to the mechanical energy over time?
It increases due to the oscillation of potential and kinetic energy
It remains constant because of the conservation of mechanical energy
It decreases as energy is lost to air resistance
It reaches zero at the maximum displacement of the spring
#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
It increases the mechanical energy of the system
It decreases the mechanical energy of the system
It has no effect on the conservation of mechanical energy
#15
In a system with energy dissipation, such as air resistance, what happens to the mechanical energy over time?
It increases due to the addition of external energy
It remains constant because energy cannot be destroyed
It decreases as energy is lost to external forces
It oscillates between potential and kinetic energy
#16
In a perfectly inelastic collision between two objects, what can be said about the conservation of mechanical energy?
It is completely conserved as both kinetic and potential energy
It is not conserved due to energy lost in the collision
It is transformed into thermal energy
It increases as a result of the collision