Energy

A girl on a motorbike passes by at a speed of 15 m/s. Her mass is 40 kg. What is her kinetic energy? 

• 300 Joules
• 600 Joules
• 950 Joules
• 4500 Joules

At what position does the pendulum have the greatest gravitational potential energy?

• Position D
• Position C
• Position B

Which character has the greatest gravitational potential energy?

• Character A
• Character B
• Character C
• Character D

Calculate the kinetic energy of a 2 kg rock that rolls down the hill with a velocity of 8 m/s.

• 64 Joules
• 16 Joules
• 128 Joules
• 8 Joules

A cinder block is sitting on a platform 20 m high. It has a mass of 8 kg. Calculate the potential energy of the cinder block. Take g = 10 N/kg.

• 1600 Joules

• 160 Joules

• 3 Joules

• 28 Joules

At which point of the roller coaster is potential energy the greatest?

• W

• X

• Y

• Z

What does conservation of energy mean?

• Total energy increases

• Total energy decreases

• Total energy stays the same

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

• more
• less
• none of the above
• all of the above 

As mass increases, KE ...

• increases
• decreases
• stays the same

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