Ideal Mechanical Advantage

A woman drives her car up onto wheel ramps to perform some repairs. If she drives a distance of 1.8m along the ramp to raise the car 0.3 m, what is the ideal mechanical advantage of the wheel ramps?

• 0.54

• 6.0

• 0.17

• 2.1

Tags

NGSS.MS-ETS1-1

The actual mechanical advantage of a machine

• cannot be less than 1

• increases with greater friction

• is always less that the ideal mechanical advantage

• is always equal to the ideal mechanical advantage

The _____ of a machine is the number of times that the machine increases the input force.

This 2000 N weight is raised 1 meter by pulling 4 meters of rope. What force was required to pull the rope?

• 500 N

• 1000 N

• 2000 N

• 8000 N

Tags

NGSS.MS-PS2-2

A box of weight W is lifted by a force F using a lever as shown below.

What is the mechanical advantage of the lever (MA=Input Distance/Output Distance)?

• 0.5

• 2

• 3

• 6

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

To increase the mechanical advantage of a lever

• make sure the fulcrum is in the middle of the lever

• move the fulcrum closer to the load

• move the fulcrum closer to the effort

• use a bigger fulcrum

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

Which of the following is true for the picture?

• elephant is the fulcrum, mouse is the effort, triangle is the load

• mouse is the fulcrum, triangle is the effort, elephant is the load

• triangle is the fulcrum, mouse is the effort, elephant is the load

This pulley

• has a mechanical advantage of 1 and does not make work easier.

• has mechanical advantage of 2 and reduces the force needed to lift an object.

• has a mechanical advantage of 2 and changes the direction of the applied force.

• has a mechanical advantage of 1 and changes the direction of the force needed to lift an object.

What is the mechanical advantage of this pulley system?

• 2

• 3

• 4

• 5

A lever is used to lift a heavy load. If the length of the effort arm is 4 meters and the length of the load arm is 1 meter, what is the ideal mechanical advantage of the lever?

• A) 0.25

• B) 4

• C) 1

• D) 5