When the pendulum passes through its equilibrium position (lowest point), its energy is:
Zero
Only kinetic energy.
A combination of kinetic and potential energy.
Only potential energy.
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
When the velocity of an object doubles while its mass remains constant, its kinetic energy:
Increases fourfold.
Decreases by half
Remains constant.
Doubles
Kinetic energy is inversely proportional to the velocity of an object.
False
True
At the midpoint between the highest point and the equilibrium position of a pendulum:
Potential energy < Kinetic energy.
Potential energy = Kinetic energy.
Potential energy = Zero
Potential energy > Kinetic energy.
When an object is in free fall from a certain height:
Kinetic energy is entirely converted into potential energy
Both potential and kinetic energy increase together
Potential energy is entirely converted into kinetic energy
Mechanical energy remains constant
Kinetic energy and mechanical energy always have the same value.
The kinetic energy of an object depends on its direction of motion.
When an object falls from a height, its potential energy converts into:
Light energy
Chemical energy.
Thermal energy.
Kinetic energy.
If the kinetic energy of an object is 200 Joules and its mass is 4 kg, its velocity is:
2.5 m/s
10 m/s
5 m/s
20 m/s
The unit of velocity in the kinetic energy equation is:
Newton
Meter/second
Meter/second squared
Joule
When an object reaches the ground after falling, its potential energy is:
Equal to its kinetic energy.
At its maximum value.
Undefined
Zero.
An object with a mass of 5 kg is placed at a height of 4 m above the ground. Its potential energy is:
200 Joules
20 Joules.
50 Joules.
100 Joules.
An object has a kinetic energy of 75 J and a mass of 1.5 kg. What is its velocity?
100 m/s
What is the unit of kinetic energy?
Watt
An object with a kinetic energy of 9 J moves at a velocity of 3 m/s. What is its mass?
6 kg
5 kg
4 kg
2 kg
What happens when an object is released from a certain height in free fall?
Kinetic energy increases, and potential energy decreases
Potential energy increases, and kinetic energy decreases
Both potential and kinetic energy remain constant
Neither energy changes
What factors determine the kinetic energy of any object?
Mass and velocity
Velocity and height
Mass and height
Weight and velocity
What is the role of the Aswan High Dam in generating electricity?
Converting electrical energy into mechanical energy
Converting the potential energy of water into kinetic energy to generate electricity
Converting kinetic energy into potential energy
Storing potential energy and converting it into thermal energy
If an object has a mass of 2 kg and moves at a velocity of 3 m/s, its kinetic energy is:
12 Joules
18 Joules
6 Joules.
9 Joules
How does a wrecking ball work?
Converting electrical energy into kinetic energy
It is not used in demolishing buildings
Converting stored potential energy into kinetic energy to demolish buildings
What is the mathematical formula for kinetic energy?
KE = ½ × v²
KE = m × v
KE = ½ × m × v
KE = ½ × m × v²
he mechanical energy of an object is equal to:
The sum of its potential and kinetic energy.
The product of its potential and kinetic energy.
The difference between its potential and kinetic energy.
Only its potential energy
Why should lifting heavy objects in a way that harms the spine be avoided?
Because lifting heavy objects reduces kinetic energy
Because the load should be on the back, not the legs
Because it can increase pressure on leg muscles
Because it can increase potential energy
When the mass of an object doubles, its kinetic energy also doubles.
When a pendulum is at its highest point, its energy is:
A combination of kinetic
Kinetic energy depends on:
The square of velocity
The square root of time
The square root of mass
The square of mass
If the mechanical energy of an object is 100 Joules and its potential energy is 60 Joules, its kinetic energy is:
160 Joules.
60 Joules.
40 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