Calculating Energy

Between a bowling ball and a soccer ball, which one has more kinetic energy and why?

• a bowling ball because it has more mass

• a bowling ball because it is smaller

• a soccer ball because it has more mass

• a soccer ball because it is smaller

A golf pro swings his driver with a mass of 0.75 kg at a velocity of 60 m/s. What is the kinetic energy of the club?

• 22.5 J

• It doesn't have kinetic energy-it has potential energy.

• 2,700 J

• 1,350 J

What is the gravitational potential energy equation (weight = mass X acceleration due to gravity)?

• PE = mass X velocity

• PE = weight X speed

• PE = weight X height

• PE = height X weight

What is the mass of a ball has a kinetic energy of 450 J, what must it mass be if it is traveling through the air at 30 m/s?

• 0.25 kg

• 15 kg

• 1 kg

• 0.50 kg

Determine the potential energy of a 5 N book that is moved to three different shelves on a bookcase. The height of each shelf is 1 m, 1.5 m, and 2.0 m.

• 5 J, 7.5 J 10 J

• 5 J, 3.3 J, 2.5 J

• 2.5 J, 5.625 J, 10 J

A baby carriage sitting at the top of a hill is at a height of 21 m high. The carriage with the baby weighs 12 N. What kind of energy does the carriage have and how much?

• potential energy and 1.75 J

• potential energy and 252 J

• kinetic energy and 252 J

• kinetic energy and 1.75 J

If the gravitational potential energy of my classroom projector is 162 J and it is 3.8 m off the ground, how much should it weigh? Round to 2 significant figures.

• 43 N

• 620 N

• 42.63 N

• 615.60 N

A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. What is the KE of the car?

• 22,400 J

• 44,800 J

• 896,000 J

• 1,792,000 J

Which of the following has the GREATEST IMPACT on the kinetic energy of an object and why?

• Mass because very small and very large things can't have the same kinetic energy.

• Velocity because its value is squared.

• Height because it can be a very large number.

• The acceleration due to gravity because it is acceleration which is more than velocity.

An 2 kg apple is hanging in a tree, 10 ft off the ground. What is the gravitational potential energy (gravity = 9.8 m/s²) of the apple?

• 960.4 J

• 98 J

• 1920.8 J

• 196 J