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WorksheetsUnderstanding Levers for Grade 7
Total questions: 15
Worksheet time: 8mins
What are the three types of levers?
First-class lever, Second-class lever, Third-class lever
Pulley, Inclined plane, Wheel and axle
Simple lever, Compound lever, Complex lever
First-class lever, Fourth-class lever, Fifth-class lever
Define mechanical advantage in the context of levers.
Mechanical advantage is the distance from the fulcrum to the input force.
Mechanical advantage is the speed ratio of the lever's movement.
Mechanical advantage is the ratio of output force to input force in levers.
Mechanical advantage is the weight of the lever itself.
Give an example of a first-class lever from daily life.
Scissors
Wheelbarrow
Seesaw
Pulley
What is the main function of a lever?
To measure weight accurately.
To amplify force and make lifting easier.
To reduce friction in machines.
To serve as a decorative tool.
How does a second-class lever differ from a first-class lever?
A first-class lever has the load between the fulcrum and the effort.
A second-class lever has the fulcrum between the load and the effort.
A second-class lever has the load between the fulcrum and the effort, while a first-class lever has the fulcrum between the effort and the load.
Both levers have the load at one end and the fulcrum at the other.
Identify a third-class lever in a common tool or device.
Tweezers
Hammer
Scissors
Pliers
What is the formula for calculating mechanical advantage?
MA = Output Force + Input Force
MA = Output Work / Input Work
MA = Output Force / Input Force
MA = Input Force / Output Force
Explain how levers can make work easier.
Levers require more effort to lift the same weight.
Levers make work easier by amplifying force, allowing a smaller effort to lift heavier loads.
Levers work by increasing the distance of the load from the fulcrum.
Levers can only be used for lifting light objects.
List one advantage of using a lever.
It amplifies force, making it easier to lift heavy loads.
It reduces the amount of space needed to lift objects.
It eliminates the need for any physical effort.
It increases the speed of lifting heavy loads.
What type of lever is a seesaw?
First-class lever
Compound lever
Third-class lever
Second-class lever
In which class of lever is the load located between the effort and the fulcrum?
Class 2 lever
Class 1 lever
Class 3 lever
Class 4 lever
Provide an example of a lever used in sports.
Baseball bat
Seesaw in gymnastics
Tennis racket
Soccer ball
How does the position of the fulcrum affect the mechanical advantage?
The position of the fulcrum directly influences the mechanical advantage by altering the effort-to-load distance ratio.
The fulcrum only affects the speed of the lever, not the mechanical advantage.
Moving the fulcrum always decreases the mechanical advantage.
The fulcrum has no effect on the mechanical advantage.
What is a common example of a lever in the kitchen?
Can opener
Microwave
Cutting board
Whisk
Describe how levers are used in construction equipment.
Levers are primarily for aesthetic design in construction machinery.
Levers are used to measure distances in construction equipment.
Levers amplify force to lift or move heavy loads in construction equipment.
Levers are only used in manual tools, not in heavy machinery.
