Kinetic and Potential Energy

What is the formula for kinetic energy?

• KE = 2mv

• KE = 1/2 m^2v

• KE = 1/2 mv^2

• KE = mv^2

If a 0.5 kg softball is thrown at 8 m/s, what is its kinetic energy?

• 4 Joules

• 16 Joules

• 8 Joules

• 32 Joules

How much work does the thrower do on the softball?

• Work is only determined by the weight of the softball.

• Work depends on the force applied and distance; specific values needed for a numerical answer.

• The distance thrown is irrelevant to the work done.

• The thrower does no work on the softball.

What is potential energy associated with?

• The temperature of an object in a vacuum.

• The mass of an object alone.

• The position of an object in a force field.

• The speed of an object in motion.

What is the formula for potential energy?

• PE = 1/2 mv^2

• PE = mgh

• PE = mvt

• PE = Fd

If a mass of 2 kg is at a height of 5 m, what is its potential energy?

• 50 J

• 75 J

• 98.1 J

• 20 J

What happens to the energy of the ball when it is caught?

• The energy of the ball remains unchanged when caught.

• The energy of the ball is transformed into thermal energy and is reduced to zero.

• The energy of the ball is converted into kinetic energy and increases.

• The energy of the ball is stored as potential energy in the catcher's hands.

How is work related to energy changes in an object?

• Work is the same as energy.

• Energy changes do not involve work.

• Work is only related to motion, not energy.

• Work is the transfer of energy that results in a change in an object's energy.

What is the unit of energy in the International System of Units?

• calorie

• volt

• joule

• watt

Can potential energy be negative? Why or why not?

• No, potential energy is always positive.

• Yes, potential energy cannot be negative due to conservation laws.

• No, potential energy is defined as a positive quantity.

• Yes, potential energy can be negative.