When an object is in free fall from a certain height:
Potential energy is entirely converted into kinetic energy
Kinetic energy is entirely converted into potential energy
Mechanical energy remains constant
Both potential and kinetic energy increase together
If an object has a mass of 2 kg and moves at a velocity of 3 m/s, its kinetic energy is:
18 Joules
6 Joules.
12 Joules
9 Joules
When a pendulum is at its highest point, its energy is:
Zero
Only kinetic energy.
Only potential energy.
A combination of kinetic
Kinetic energy is inversely proportional to the velocity of an object.
False
True
What is the role of the Aswan High Dam in generating electricity?
Storing potential energy and converting it into thermal energy
Converting electrical energy into mechanical energy
Converting kinetic energy into potential energy
Converting the potential energy of water into kinetic energy to generate electricity
Kinetic energy and mechanical energy always have the same value.
At the midpoint between the highest point and the equilibrium position of a pendulum:
Potential energy = Kinetic energy.
Potential energy = Zero
Potential energy > Kinetic energy.
Potential energy < Kinetic energy.
An object with a mass of 5 kg is placed at a height of 4 m above the ground. Its potential energy is:
100 Joules.
50 Joules.
20 Joules.
200 Joules
When the pendulum passes through its equilibrium position (lowest point), its energy is:
A combination of kinetic and potential energy.
When an object reaches the ground after falling, its potential energy is:
Zero.
At its maximum value.
Undefined
Equal to its kinetic energy.
An object with a kinetic energy of 9 J moves at a velocity of 3 m/s. What is its mass?
4 kg
6 kg
2 kg
5 kg
When the mass of an object doubles, its kinetic energy also doubles.
What is the mathematical formula for kinetic energy?
KE = ½ × m × v
KE = ½ × m × v²
KE = ½ × v²
KE = m × v
When an object is in free fall, its mechanical energy remains constant because:
Potential energy converts into kinetic energy.
There is no friction.
Kinetic energy converts into potential energy.
All of the above
The kinetic energy of an object depends on its direction of motion.
If the kinetic energy of an object is 200 Joules and its mass is 4 kg, its velocity is:
10 m/s
2.5 m/s
5 m/s
20 m/s
If the mechanical energy of an object is 100 Joules and its potential energy is 60 Joules, its kinetic energy is:
60 Joules.
40 Joules
160 Joules.
Where is potential energy at its maximum?
When the object reaches the ground
When the object is at its highest point from its original position
When the object passes through its original position
At the start of motion
How does a wrecking ball work?
It is not used in demolishing buildings
Converting stored potential energy into kinetic energy to demolish buildings
Converting electrical energy into kinetic energy
What factors determine the kinetic energy of any object?
Weight and velocity
Mass and velocity
Mass and height
Velocity and height
Kinetic energy depends on:
The square of velocity
The square of mass
The square root of time
The square root of mass
Why should lifting heavy objects in a way that harms the spine be avoided?
Because it can increase potential energy
Because lifting heavy objects reduces kinetic energy
Because it can increase pressure on leg muscles
Because the load should be on the back, not the legs
When an object falls from a height, its potential energy converts into:
Chemical energy.
Kinetic energy.
Thermal energy.
Light energy
The unit of velocity in the kinetic energy equation is:
Joule
Meter/second
Meter/second squared
Newton
What is the unit of kinetic energy?
Watt
An object has a kinetic energy of 75 J and a mass of 1.5 kg. What is its velocity?
100 m/s
he mechanical energy of an object is equal to:
The product of its potential and kinetic energy.
The difference between its potential and kinetic energy.
The sum of its potential and kinetic energy.
Only its potential energy
What happens when an object is released from a certain height in free fall?
Both potential and kinetic energy remain constant
Neither energy changes
Kinetic energy increases, and potential energy decreases
Potential energy increases, and kinetic energy decreases
When the velocity of an object doubles while its mass remains constant, its kinetic energy:
Decreases by half
Remains constant.
Increases fourfold.
Doubles