Energy: Potential, Kinetic, & Mechanical

An object has 14.3 J of Potential Energy and 22.1 J of Kinetic Energy.  What is the mechanical energy of the system?

• 7.8 Joules

• 18.2 Joules

• 36.4 Joules

• 316.03 Joules

What is the Kinetic Energy of an 8.00 kg bowling ball rolling at 2.20 m/s?

• 5.8 Joules

• 8.8 Joules

• 10.2 Joules

• 19.36 Joules

A softball is thrown with 150 joules of energy. If the ball is moving at 30.0 m/s, what is the mass of the ball in kg?

• 0.33 kg

• 0.50 kg

• 5.0 kg

• 10.0 kg

A 12.0 kg rock is sitting on a cliff.  If the rock has 2500 joules of Potential Energy, what is the height of the cliff in m?

• 2.08 m

• 16.67 m

• 20.80 m

• 21.26 m

What happens to the Kinetic Energy and Gravitational Potential Energy of a ball in a free fall?

• a)       Kinetic Energy and Gravitational Potential Energy both increase.

• b)       Kinetic Energy and Gravitational Potential Energy both decrease.

• c)       Kinetic Energy increases and Gravitational Potential Energy decreases.

• d)       Kinetic Energy decreases and Gravitational Potential Energy increases.

Kinetic Energy (KE) is changed to Potential Energy (PE) when ____.

• a)       a skier skis down a slope, arriving at a lower elevation

• b)       a car speeds up along a flat highway

• c)       a roller coaster slows down as it climbs up a hill

• d)       a ball rolls to the bottom of as inclined plane

A moving van burns gasoline in its engine. During this process it converts –

• a)       chemical energy into mechanical energy

• b)       kinetic energy into potential energy

• c)       thermal energy into electrical energy

• d)       mechanical energy into kinetic energy

Which of the following systems has Kinetic Energy?

I.   Water flowing down a river

             II.   A bowling ball rolling down an alley

           III.   A rock sitting on the edge of a cliff

• a) I.

• b) I. and II.

• c) II. and III.

• d) I., II., and III.

A teacher asks the students to decrease their Kinetic Energy. What could the students do to decrease their Kinetic Energy the most?

• a) Run to the front of the room.

• b) Sit down and stop moving.

• c) Jump up and down.

• d) Stand up and move their arms.

A student wants to place a ball on a ramp where it will have the GREATEST potential energy.  On which point on the ramp should the student place the ball?

• a) On the very top of the ramp

• b) In the middle of the ramp

• c) At the bottom of the ramp

• d) Under the ramp