Work, energy and Power (Revision)

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

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 does the pendulum have the least amount of potential energy?

• A

• B

• C

• D

• E

Where is kinetic energy at its maximum?

• a

• b

• c

• d

A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is(g = 10 m/s²)

• (a) 500 J

• (b) 50 J

• (c) 5 J

• (d) 5000 J

 Work done = Force x _________

• a. distance
• b. acceleration
• c. velocity
• d. speed