Physics Energy Review

What is the equation for kinetic energy?

• K=(m)(h)(10)

• K=1/2(k)(x)^2

• K=1/2(m)(v)

• K=1/2(m)(v)^2

Tags

NGSS.MS-PS3-1

What are examples of non-mechanical energies?

• Friction

• Potential Energy

• Air Resistance

• Kinetic Energy

Truck 1 is a 500-kg object traveling at a velocity of 35 m/s, and truck 2, is a 400-kg object traveling at a velocity of 40 m/s. Which object has a larger kinetic energy?

• Truck 1

• Truck 2

• The two trucks have the same kinetic energy

• Not enough info is provided

Tags

NGSS.MS-PS3-1

A truck has 2 times the mass of yet another truck, and is moving at the same velocity. If K₁ and K₂ refer to the two trucks respectively, it is correct to say that

• K₁=4K₂

• K₁=3K₂

• K₁₌2K₂

• K₁₌K₂

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

What is the potential energy of a ball, held at a height of 45 m, with a mass of 2-kg.

• U_g= 400 N

• U_g= 600 N

• U_g= 700 N

• U_g= 900 N

Tags

NGSS.MS-PS3-2

What is the equation for spring potential energy?

• U_s= (k)(x)²

• U_s= (k)(x)

• U_s= 1/2(k)(m)

• U_s= 1/2(k)(x)²

A stone is held at a height h above the ground. A second stone with six times the mass of the first stone is also held at height h. the gravitational potential energy of the second stone stone compared to the first one is...

• One-fourth as much

• Twice as much

• Three times as much

• Six times as much

Tags

NGSS.MS-PS3-2

Which of the following equations is the correct formula for power?

• P=W/t

• P=N/t

• P=F*t

• P=E/t

How fast must a 5-kg cat have to run in order to have a kinetic energy of 170 J?

• V= 1.2/s

• V=20m/s

• V=9.2m/s

• V=8.2m/s

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