Work/Power/Energy

Work/Power/Energy

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Multiple Choice

_______________ is done when a force acts on an object and the object moves in the direction of the force.

• Work

• Kinetic energy

• Watt

• Joule

Multiple Choice

If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?

• 272 m

• 17 m

• 4.05 m

• 272 cm

Multiple Choice

If 150 Joules of work is needed to move a box 10 meters, what force was used?

• 1500 N

• 15 N

• 1.5 N

• 150 N

Multiple Choice

How do we calculate work?

• W = F * d

• w = f * D

• W = F * D

• w = f * d

Multiple Choice

Which statement illustrates work done?

• A weightlifter holds a barbell above her head.

• A teacher applies a force to a wall and becomes exhausted.

• A rolling marble hits a note card and moves it across a table.

• A waiter carries a tray full of meals across a dining room at a constant speed.

Multiple Choice

The unit of power (aka Joule per second)

• Joule

• Minute

• Watt

• Pound

Multiple Choice

The equation for POWER is

• power = mass x time

• power = work / time

• power = time / work

• power = work x time

Multiple Choice

A 100 N force is applied to move an object a horizontal distance of 5 meters at constant speed in 10 seconds. How much power is done?

• 50J

• 50W

• 500J

• 500W

Multiple Choice

What type of energy transformation takes place when you plug in a lamp and turn it on?

• electrical to radiant

• electrical to mechanical

• chemical to radiant

• mechanical to thermal

Multiple Choice

Energy that is stored in bonds between atoms is:

• Mechanical energy
• Chemical energy
• Kinetic energy
• Nuclear energy

Multiple Choice

If a 1300-kg car has been lifted so it has 19500 J of potential energy, it was lifted up ---.

• 1.5 m

• 150 m

• 15 m

• 0.67 m

Multiple Choice

What is the energy of position or shape that depends on weight and height, also called stored energy?

• Energy
• Kinetic energy
• Potential energy
• Sound energy

Multiple Choice

Gravitational potential energy depends on the ________ and ________ of the object.

• Height and mass

• Friction and movement

• Mass and Movement

• Height and Friction

Multiple Choice

Which does not illustrate kinetic energy?

• It is expressed in Joule.

• It depends upon the objects’ mass and speed.

• It is the energy an object possesses due to its motion.

• It depends upon the objects’ mass and objects’ height.

Multiple Choice

If the mass of the cart is 8.12kg, what is the kinetic energy of the cart?

• 0J

• 1.2J

• 6J

• 58.8J

Multiple Choice

What is the formula for Kinetic Energy?

• PE = m*g*h

• KE = 1/2m*v2

• W = F*d

• P = W/t