2.3 Work, Energy and Power

Work causes a change in

• Sweat

• Energy

• Calories

• Force

Power is a _______ dependent quantity.

• Outlet

• Energy source

• Time

• Volume

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

• 15 J
• 45 J
• 0 J
• 5 J

Which situation is work not done?

• lifting a 20 pound box off the floor
• holding a 20 pound box above the floor
• sliding a 20 pound box across the floor
• sliding a 20 pound box up an inclined plane

What is the unit of measurement for power?

• Joules
• Watts
• Voltage
• Calories

Kinetic energy is associated with ---.

• speed

• position

• direction

• temperature

Energy from a compressed spring would be an example of...

• kinetic
• elastic
• gravitational
• chemical

How do you calculate power?

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

What is the formula for Kinetic Energy?

• PE = m*g*h
• KE = 1/2m*v2
• W = F*d
• P = W/t

Where is the kinetic energy of pendulum at its highest?

• at the top of the swing

• at the bottom of the swing

• at 1/4 of the swing

• at 3/4 of the swing