Conservation of Mechanical Energy

An object is speeding up when: (Choose All That Apply) (May have to choose more than 1 to be right)

• it is gaining kinetic energy.

• it is losing kinetic energy.

• it is gaining gravitational potential energy.

• it is losing gravitational potential energy.

The sum of the kinetic and potential energy in a system is known as the system's _____________________ energy.

• mechanical

• chemical

• thermal

• combined

How much kinetic energy (K) does a baseball with a mass of 0.143 kg have if it is travelling at a velocity of 41.1 m/s?

HINT: K = 1/2mv²

• 120.8 joules

• 89.7 joules

• 108.3 joules

• 156.6 joules

If a ball tossed into the air has a maximum gravitational potential energy of 5.75 joules, what is its maximum kinetic energy in the same toss?

• 5.75 joules

• 11.14 joules

• 2.88 joules

• 7.93 joules

A 1.0 kg ball is stationary at the top of a hill that is 10.0 meters in height. The ball rolls all the way down the hill. What is its gravitational potential energy at the bottom of the hill?

• 0 joules

• 98 joules

• 49 joules

• 38 joules

What is the MECHANICAL energy of the roller coaster car?

• 100 joules

• 50 joules

• 2500 joules

• 1 joule

This drawing illustrates which of the following?

• Conservation of Mechanical Energy

• Conservation of Mass

• Conservation of Momentum

• Conservation of Matter

What was the Potential energy of the car at very top of the hill if the car had 0 J of Kinetic energy?

• 100 joules

• 50 joules

• 2500 joules

• 1 joule

What was the Kinetic energy of the car at near the bottom of the hill if the car still had 10 J of Potential energy?

• 10 joules

• 50 joules

• 90 joules

• 500 joule

At which point in the picture must the cart have been moving the fastest?

• Point 1

• Point 2

• Point 3

• They would all be the same