Mechanical advantage

How much effort would it take to lift Lever A?

• 60 N

• 50N

• 40 N

• 30 N

How much effort would it take to lift Lever B?

• 60 N

• 50 N

• 40 N

• 30 N

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

What is effort (input) force?

• the force one exerts on a machine

• the force which an effort force must overcome in order to do work on an object via a simple machine.

• the force the machine exerts on a object

• the output work times the input distance

What's the ratio?

• 1:1

• 84 : 60

• 60 : 36

A lever type 1 with a length of 1.2 meters has an input arm length of 80 cm are used to lift a fallen tree, which has a weight of 480 N.

What is the input force that will begin lifting the tree off the ground?

• 32,000 N

• 320 N

• 240 N

• 960 N

A 10 Newton effort force is required to lift a 10 kg box just off the ground. What is the effort required to lift the box off the ground using a 3m long lever? [The fulcrum is placed 0.5m from the box.]

• 0.5 N
• 2.0 N
• 5.0 N
• 8.0 N

If a pulley system has a mechanical advantage of 4, what does that mean?

• This means that it is 4 times easier to lift this load.

• This means you only need a quarter of the effort to lift the load.

• For example, if you lifted 100 kg, it would only take 25 kg of effort.

• All of the above

A simple gear train is composed of three gears. Gear A is the driver and has 60 teeth, gear B has 40 teeth, and gear c has 15 teeth. If the output at gear C is 300 RPM, what is the input torque at gear A?

• 600 RPM

• 1200 RPM

• 75 RPM

• 2400 RPM

TYPE OF LEVER?

• 1

• 2

• 3