Science 8 Unit D 2.0

How much work is produced when 350 N is used to move a car 5 m?

• 70 J
• 1750 J
• 355 J
• 175 J

What is the mechanical advantage of the pulley system in the picture?

• 2
• 3
• 4
• 5

How does a single fixed pulley, like the one seen here, help you do work?

• changes the direction of the force
• increases the amount of applied force
• decreases the amount of applied force
• allows you to pull the rope a shorter distance

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

The mechanical advantage of this inclined plane is.....

• 2.4
• 3.4
• 4.4

How can you decrease the effort force needed to push a weight to the top of the ramp? 

• cover the surface with carpet
• increase the length of the ramp
• increase the height of the ramp
• decrease the length of the ramp

A 16 N force is applied to an object and 96 J of work is done. How far was the object moved?

• 6 m
• 16 m 
• 80 m 
• 1536 m 

What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J is produced by the machine?

• 0.25 J
• 26%
• 386%
• 3.86 J

What is the efficiency of the machine if the work input is 263 J and the work output is 142 J? 

• 6.26%
• 54%
• 100%
• 260%

if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?

• 120 N
• 5 N
• 2000 N
• 80 N

Tags

NGSS.MS-PS2-2