Focus On Life Science: California Grade 7

Lesson 2: The Body and Levers

Standards Check

1.
In which class of levers is the resistance between the fulcrum and the effort? 6.h
A)second-class levers
B)first-class levers
C)third-class levers
D)all classes of levers
2.
Your upper and lower leg along with your knee joint forms a ______ lever. 6.h
A)first-class lever
B)third-class lever
C)second-class lever
D)first- and second- class levers
3.
Which of these acts as a fulcrum in the body? 6.h
A)tendon
B)muscle
C)bone
D)joint
4.
Which class of lever is found most in the human body? 6.h
A)first- and second- class levers
B)first-class lever
C)second-class lever
D)third-class lever
5.
On what point does a lever pivot? 6.h
A)the arm
B)the middle
C)the fulcrum
D)the end
6.
Mechanical advantage is equal to __________ 6.h
A)input force divided by output force
B)output force divided by input force
C)input force times output force
D)output force times input force
7.
What is the mechanical advantage if 50 J are put in and 200 J are produced? 6.h
A)4
B)1000
C)50
D)200
8.
The __________ is the number of times a force is multiplied by a machine. 6.h
A)effort force
B)mechanical advantage
C)resistance force
D)power
9.
Which of the following tools is a lever? 6.h
A)ramp
B)shovel
C)screw
D)ax
Grade 7
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