Homework 6

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.

How do you calculate power?

• P = W/t
• P = E/t
• P = w * t
• P = bbq/chicken

How do we calculate work?

• W = F * d
• w = f * D
• W = F * D
• w = f * d

The SI unit of work is?

• Joules
• Watts
• Newtons
• meters

The energy of movement is...? 

• Kinetic
• Potential

The SI unit for power is...?

• Watts
• Joules
• Newtons
• Meters

The faster an object moves, the ________ kinetic energy it has. 

• more
• less
• none of the above
• all of the above 

The equation for POTENTIAL ENERGY is

• PE = mass x gravity x height

• PE = gravity x weight

• PE = height / work

• PE = work / time

Energy cannot be ________ or ___________.

• big/small

• left/right

• created/destroyed

• made/transferred

What is g on Earth?

• 9.8 m/s/s
• 9.8 m/s
• 42 m*s
• 42 m/s/s