Ch 6 Work,Power,Machine Practice

units of force are

• newtons

• grams

• joules

• meters

units for work are

• newtons

• joules

• meters

• seconds

if you push a cart with a force of 60 N for 2 m... how much work have you done

• 120 J

• 30 J

• 120 N

• 30 N

What is the formula for work?

• Force = work x distance
• Distance = force x work
• Work = force x distance
• Work = force x mass

Fred kicks a ball with a force of 20N to George, who is 5M away. How much work was done to the ball?

• 25J

• 100J

• 4J

• 75J

Energy can not be created or destroyed, only converted from one form to another.

• true
• false

Force is a _____ or _______

• simple    complex
• push     pull
• up      down
• in      out

Which is doing work?

• pushing a wall
• holding a box
• picking up a pencil
• sitting in a chair

No machine can be 100% efficient because of

• Thermal energy

• Waste energy

• Convection energy

• Friction

Which is not considered a simple machine?

• The pump

• The wheel & axle

• The wedge

• The screw

• The pulley