CH 9 Work, Energy, & Power

What is the mechanical advantage of a ramp that is 10 meters long and 2 meters high?

• 20
• 5
• 8
• 15

A first-class lever has the fulcurm

• at the right end
• at the left end
• in the middle
• none of the above

A wheelbarrow is an example of

• first-class lever
• second-class lever
• third-class lever
• fourth-class lever

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which is an example of a third-class lever?

• a nutcracker
• a handheld boat paddle
• a crow bar 
• a screw

A transfer of energy to a body by the application of a force that causes the body to move in the direction of the force is called

• power.
• work.
• distance.
• mechanical advantage.

A boy exerts an average force of 65N when he lifts a box 1.2 meters. How much work does he do?

• 0J
• 54J
• 66J
• 78J

Tags

NGSS.HS-PS3-2

__ is defined as the rate at which work is done.

• Power
• Joule
• Speed
• Mechanical Advantage

How much power is required to do 180J of work in 2.4s?

• 7.5W
• 75W
• 178W
• 430W

How much power is required to lift a 30.0N chair 0.20m in 2s?

• 3.0W
• 1.0W
• 12W
• 15W

What are the two families of simple machines?

• wedge and compound
• first and second class
• inclined plane and lever
• pulley and screw