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