Power, Machines, and Force

What is the unit used to measure Power?

• Joule
• Watt
• Newton
• Pascal

Force X Distance = _______?

• Work
• Power
• Energy
• Force

In which of these cases is work being done? 

• A student sleeps
• A student pushes a locked door that does not move
• a student carries his chair into another room
• A student sits on the carpet

What is the unit used to measure work?

• Joule
• Watt
• Newton
• Pascal

Tags

NGSS.MS-PS3-5

Work/Time = ________?

• Force
• Speed
• Velocity
• Power

Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?

• 1
• 10
• 100
• 1000

A watt is defined as ___________

• One joule per second
• One horsepower per second
• A force of one pound over a distance of one foot
• A force of one newton over a distance of one meter

You test a machine and find it exerts a force of 45 N for each 5 N of force you exert operating the machine. What is the Actual Mechanical Advantage of the machine?

• 10

• 11

• 9

• 5

You exert 640 J of work lifting a box in a time of 2 seconds. How much power is used to lift the box?

• 642 W

• 640 W

• 1280 W

• 320 W

A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball? 

• 77 J
• 7.7 J 
• 0.7 J 
• 770 J 

Tags

NGSS.HS-PS3-2