Calculating Kinetic Energy

The faster an object moves, the ________ kinetic energy it has. 

• more

• less

• none of the above

• all of the above 

Tags

NGSS.MS-PS3-1

Kinetic energy=

• ½×Mass×Speed2

• ½×Mass×Speed

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NGSS.HS-PS3-3

suppose a girl with a mass of 50 kg is jogging at a speed of 2 meters per second (m/s). Note that1kg.m2/s2=1joule (J)

• =100 J

• =50J

What is the kinetic energy for the white dog? remeber use the formula: Ke=1/2 X m X V²

• 45 J

• 55J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

What is the kinetic energy for the black dog?

• 100 J

• 90 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

As velocity increases...

• Kinetic energy increases linearly

• Kinetic energy decreases linearly

• Kinetic energy increases by the square of the velocity

• Kinetic energy decreases by the square of the velocity

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NGSS.HS-PS3-2

A race car accelerates away from the start line. After 1s it is travelling at 10m/s, and has a kinetic energy of 5kJ. At full speed the car is travelling at 100m/s. What is the kinetic energy of the car at full speed?

• 5kJ

• 95kJ

• 50kJ

• 500kJ

Tags

NGSS.HS-PS3-1

A space rocket is taking off, with a total mass of 1500 tonnes. Just after launching, it is travelling at 10m/s and has kinetic energy of 75MJ. 10 minutes into the flight, it has burned 500 tonnes of fuel. It is now travelling at 100m/s. What is the new kinetic energy?

• 250MJ

• 2500MJ

• 7500MJ

• 750MJ

Tags

NGSS.HS-PS3-1

The energy of motion is called:

• Friction

• Kinetic energy

• Potential energy

• Gravitational energy

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

As mass increases...

• Kinetic energy increases linearly

• Kinetic energy decreases linearly

• Kinetic energy increases by the square of the mass

• Kinetic energy decreases by the square of the mass