Soc 20

Question 1

What is a lever?

Answer 1

A lever is a rigid bar that rotates around a fixed point called the fulcrum.

Question 2

Name the three classes of levers.

Answer 2

First class, second class, and third class levers.

Question 3

In a first class lever, where is the fulcrum located?

Answer 3

The fulcrum is located between the effort and the load.

Question 4

True or False: In a second class lever, the load is between the fulcrum and the effort.

Answer 4

True.

Question 5

Fill in the blank: In a third class lever, the effort is applied ______ the load.

Answer 5

closer to.

Question 6

Give an example of a first class lever.

Answer 6

A seesaw.

Question 7

What is the mechanical advantage of a lever?

Answer 7

The ratio of the load force to the effort force.

Question 8

True or False: A first class lever can have a mechanical advantage greater than 1.

Answer 8

True.

Question 9

What type of lever is a wheelbarrow?

Answer 9

A second class lever.

Question 10

Which lever class is most commonly found in the human body?

Answer 10

Third class levers.

Question 11

Identify one advantage of third class levers.

Answer 11

They allow for a greater range of motion.

Question 12

What is the role of the fulcrum in a lever system?

Answer 12

The fulcrum acts as the pivot point around which the lever rotates.

Question 13

Name a sporting example of a third class lever.

Answer 13

A bicep curl.

Question 14

What does the term ‘effort arm’ refer to?

Answer 14

The distance from the fulcrum to the point where the effort is applied.

Question 15

Fill in the blank: The ______ arm is the distance from the fulcrum to the load.

Answer 15

load.

Question 16

In levers, what does a longer effort arm provide?

Answer 16

It provides a greater mechanical advantage.

Question 17

What is the formula to calculate mechanical advantage?

Answer 17

Mechanical Advantage = Length of Effort Arm / Length of Load Arm.

Question 18

True or False: All levers are used to lift loads.

Answer 18

False.

Question 19

What is a common example of a second class lever in sports?

Answer 19

A leg press machine.

Question 20

How does the position of the fulcrum affect the lever type?

Answer 20

It determines whether the lever is first, second, or third class.

Question 21

Give an example of a first class lever in the human body.

Answer 21

The neck when tilting the head back.

Question 22

What type of lever is used when performing a chest press?

Answer 22

Third class lever.

Question 23

What advantage do second class levers have in lifting?

Answer 23

They require less effort to lift a load.

Question 24

In a lever system, what is the effect of increasing the effort distance?

Answer 24

It decreases the effort needed to lift the load.

Question 25

What lever class is represented by a crowbar?

Answer 25

First class lever.