7.3 Principle of Conservation of energy

The Law of Conservation of Energy states:

• Energy can created or destroyed but not transformed

• Energy cannot be created or destroyed, it can only transformed

• Energy can't be created, destroyed or transformed

• Energy cannot be created or destroyed.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

State the change in energy form from Q to R.

• Gravitational potential energy → Kinetic energy

• Kinetic energy → Elastic potential energy

• Elastic potential energy → Kinetic energy

• Kinetic energy → Gravitational potential energy

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-4

At which point that the kinetic energy is at the maximum?

• W

• X

• Y

• Z

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Calculate the potential energy when the roller coaster is at point Y. The mass of the roller coaster is 100kg.

Gravitational potential energy = mass, m x gravitational acceleration, g x height. Use g = 10 m/s²

• 3000 J

• 6000 J

• 9000 J

• 120000 J

Tags

NGSS.MS-PS3-2

From the diagram, state at which point the gravitational potential energy is maximum.

• W

• X

• Y

• Z

Tags

NGSS.MS-PS3-2

Which of the position of the ball ONLY possesses gravitational potential energy? Tick the correct answers.

• A

• B

• C

• D

Tags

NGSS.MS-PS3-2

NGSS.MS-PS2-4

What is the formula for Kinetic Energy?

• KE = mass x velocity

• KE= 1/2 x mass x velocity ²

• KE = mass x gravity x height

• KE = mass x velocity / 2

Tags

NGSS.MS-PS3-1

What happens when the ball goes from the highest position to the lowest position

• PE and KE increases and decreases together

• Impossible to know without knowing the mass of the object

• the PE decreases while KE increases

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A 70 kg runner has a velocity of 5 m/s. Her kinetic energy is

• 875 J
• 175 J
• 1750 J
• 350 J

Tags

NGSS.MS-PS3-1

At which point(s) on the roller coaster is the gravitational potential energy at its maximum?

• A
• B
• C
• D

Tags

NGSS.MS-PS3-2

NGSS.MS-PS2-4