Mechanical Energy

gravitational potential energy is defined as

• the energy an object has due to its height above the ground
• the energy an object has due to its motion
• the energy a spring has due to its stretch
• the chemical energy stored in the molecules of atoms

the equation for gravitational potential energy is

• E_p = mgh

• E_p = 1/2kx²

• E_p = Fd

• E_p = 1/2mv²

What are the two types of Mechanical Energy? (E_m)

• Kinetic and Potential Energy

• Kinetic and Nuclear Energy

• Potential and Chemical Energy

• Thermal and Kinetic Energy

The equation to find kinetic energy is

• E_k =1/2mv²

• E_k =mgh

• E_k =1/2kx²

• E_k =Fd

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

Which of the following objects has the most kinetic energy?

• A 20 kg toddler running at 5 m/s
• A 50 kg toddler running at  30 m/s
• A 90 kg toddler running at 30 m/s
• A 100 kg  toddler running at 2 m/s

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

NGSS.MS-PS3-4

A 5 kg ball is lifted 12 m above the ground. It's gravitational potential energy is

• 60 J

• 590 J

• 17 J

• 2.4 J

You hold a 5 kg ball from a height of 2 m. How much mechanical energy does it have?

• 10 J

• 7 J

• 98 J

• 25 J

You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, what type of energy does it have?

• Potential Energy
• Kinetic Energy
• Nuclear Energy
• Chemical Energy

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, how much kinetic energy does it have?

• 10 J

• 98 J

• 7 J

• 20 J