Machines

Question 1

What are simple machines?

Answer 1

device that makes work easier by changing the direction or magnitude of a force

Question 2

What do simple machines do

Answer 2

They reduce the effort to perform a task

Question 3

What are inclined planes

Answer 3

its a machine that makes it easier for us to move objects to a higher or lower surface

Question 4

What is the trade-off (mechanical advantage) of incline planes

Answer 4

If the slope is gentle, a person has to push or pull the object over a longer distance, but with little effort. If the slope is steep, a person has to push or pull the object over a very short distance, but with more effort.

Question 5

how can a wedge be used

Answer 5

To cut (knife)
To split (axe)
To tighten and to hold back (doorstopper)
To hold together (nail)
To scrape (blades on the snowplow or farm grader)

Question 6

how does wedges work

Answer 6

it works by changing direction and force applied to it.

Question 7

The trade-off for wedges

Answer 7

The longer and thinner a wedge is (sharper), the more work it does with little effort. If the wedge is shorter and has a wider angle at the tip, one needs more force to do the work.gh

Question 7

What is a screw?

Answer 7

A screw is an inclined plane around a cylinder, with a head at one end, a pointed tip at the other, and threads winding around it.

Question 7

What is the purpose of the thread on a screw?

Answer 7

The thread provides grip and resistance, allowing the screw to hold things together, lift items, and tighten objects.

Question 8

What is the distance between threads on a screw called?

Answer 8

Pitch

Question 9

How does a screw differ from a nail in terms of insertion into wood?

Answer 9

A screw requires turning with a screwdriver due to its threads, which create more friction and resistance, unlike a nail which is hammered in directly.

Question 10

What is a bolt and how is it used differently from a regular screw?

Answer 10

A bolt is a type of screw without a pointed tip, inserted through a pre-made hole and secured with a nut.

Question 11

What is a drill bit and what is its function?

Answer 11

A drill bit is a type of screw used to create holes in various materials when attached to an electric drill

Question 12

Mechanical advantage of a screw

Answer 12

Wider thread spacing requires more effort but fewer turns to drive the screw into an object.

Question 13

What is a lever?

Answer 13

A lever is a plank or rigid beam that is free to rotate on a pivot, used to lift or move heavy objects.

Question 14

What are the four important parts of a lever?

Answer 14

The four parts are the bar or beam, the fulcrum (pivot), the effort (force), and the load.

Question 15

What is the role of the beam in a lever?

Answer 15

The beam is a long plank that rests on the fulcrum and is used to apply force and move the load.

Question 16

What is the fulcrum in a lever?

Answer 16

The fulcrum is the pivot or turning point on which the beam rests and rotates.

Question 17

How does a lever make work easier?

Answer 17

A lever increases the input force and changes the direction of the input force to lift the load.

Question 18

What is the arrangement of parts in a Class One Lever?

Answer 18

In a Class One Lever, the fulcrum is between the effort and the load. Examples: seesaws, boat oars, and crowbars.

Question 19

Where is the load positioned in a Class Two Lever?

Answer 19

In a Class Two Lever, the load is between the effort and the fulcrum. Examples: wheelbarrows.

Question 20

How is the effort positioned in a Class Three Lever?

Answer 20

In a Class Three Lever, the effort is between the load and the fulcrum. Example: garden shovel.

Question 21

How does the position of the load or effort affect mechanical advantage in levers?

Answer 21

The mechanical advantage is greater if the load is closer to the fulcrum in Class One and Two Levers, and if the effort is closer to the load in Class Three Levers.

Question 22

work =?

Answer 22

force x displacement

Question 23

How to calculate mechanical advantage

Answer 23

MA= Output force/Input force

Question 24

how is the number of ropes used to lift the object relate to mechanical advantage of the pulley

Answer 24

Mechanical advantage =number of ropes used to lift the object

Question 25

Work of output side=work of input side
T/F

Answer 25

TRUE

Question 26

What is a pulley and how does it work?

Answer 26

A pulley is a wheel with a groove and a rope in the groove, used to lift or lower heavy objects by changing the direction of the applied force.