Ke and PE

Malcolm's class has been assigned a project in which it is to build a four-wheeled vehicle to transport a soda can across the classroom. The car will be powered by stretching rubber bands around an axle before releasing the vehicle on the floor.

The vehicle will be powered by transforming _______ energy into _______ energy.

• mechanical; thermal

• thermal; mechanical

• elastic potential; kinetic

• kinetic; elastic potential

The following diagram of a pendulum shows the path it takes as it swings back and forth.

As the pendulum moves from point 1 to point 2, what happens to its mechanical energy?

• Kinetic energy is converted to potential energy and back again.

• Potential energy is converted to kinetic energy only once.

• Potential energy is converted to kinetic energy and back again.

• Kinetic energy is converted to potential energy only once.

What is the formula for Gravitational Potential Energy?

• PE = mgh

• KE = 1/2mv²

• W = Fd

• P = W/t

What is the formula for Kinetic Energy?

• PE = mgh

• KE = 1/2mv²

• W = Fd

• P = W/t

What is the KE of a football which has a mass of 0.8 kg and is kicked at a velocity of 10m/s?

• 80 J

• 3.2 J

• 160 J

• 40 J

What is the kinetic energy of a zorb and human with a total mass of 90Kg rolling at 10m/s?

• 3,700J

• 900J

• 4,500J

• 6,500J

A golf pro swings his driver which has a mass of 0.75Kg at a velocity of 60 m/s. Calculate the kinetic energy of the club.

• 2700 J

• 16.9 J

• 1350 J

• 45 J

A leopard with a mass of 55.00 kg climbs 12.0 m up a tree. What is its GPE?

• 6,468 J
• 660 J
• 4.58 J
• 0.22 J

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

• more

• less

At which point is potential energy greatest?

• W
• X
• Y
• Z