9th grade Semester 1 Test 2024

Front

What is kinetic energy?

Back

Kinetic energy is the energy an object possesses due to its motion, calculated using the formula KE = 1/2 mv², where m is mass and v is velocity.

Front

How do you calculate kinetic energy?

Back

Kinetic energy (KE) is calculated using the formula KE = 1/2 mv², where m is the mass of the object in kilograms and v is its velocity in meters per second.

Front

What happens to kinetic energy if the speed of an object doubles?

Back

If the speed of an object doubles, its kinetic energy increases by a factor of four, since KE is proportional to the square of the speed.

Front

What is gravitational potential energy (GPE)?

Back

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field, calculated using the formula GPE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

How do you calculate gravitational potential energy?

Back

Gravitational potential energy (GPE) is calculated using the formula GPE = mgh, where m is mass in kilograms, g is approximately 9.8 m/s², and h is height in meters.

Front

What is the relationship between speed and kinetic energy?

Back

The kinetic energy of an object increases with the square of its speed; as speed increases, kinetic energy increases significantly.

Front

What is the principle of energy conservation?

Back

The principle of energy conservation states that energy cannot be created or destroyed, only transformed from one form to another.

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What are the energy conversions in a car engine?

Back

In a car engine, energy conversions occur from chemical energy (fuel) to thermal energy (heat) to mechanical energy (motion).

Front

What is acceleration?

Back

Acceleration is the rate of change of velocity of an object, measured in meters per second squared (m/s²).

Front

How is acceleration calculated?

Back

Acceleration is calculated using the formula a = (final velocity - initial velocity) / time.