Simple and Complex Machines Grade 4

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Simple & complex machines basics

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Ashish Malviya

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Simple and Complex Machines Grade 4


Froggy Jumps Simple and Complex Machines Grade 4Versión en línea Simple & complex machines basics por Ashish Malviya 1 What is the meaning of a mechanism in machines? a A single part performing a task b A passive component with no moving parts c A system of parts working together to make something move 2 What does linear mean in motion terms? a Nearly a straight line b Orbiting around a center c Curved path 3 Define torque. a A straight pushing force b A static balance force c A twisting force that tends to cause rotation 4 What does rotary describe? a Moving in a straight line b Revolving around a centre c Staying fixed in place 5 Input in a mechanism refers to what? a The final output b The device’s power source c The value you start with 6 Output is best described as? a The final result produced b The gear’s speed only c Initial input value 7 What is a gear system? a Two or more gears transmitting power b A pulley with a belt c A single lever actuator 8 Gears in a system can change what aspect? a Only color b Only weight c Speed, torque, and direction 9 What is a gear ratio? a A color code for gears b A safety rating c A way to change speed or torque between gears 10 Where are gear systems commonly used? a Cars and factory machines b In ancient tools c Only bicycles 11 What is a pulley system? a A spring mechanism b A wheel with an axle and rope to lift loads c A fixed gear train 12 How does a pulley system reduce effort? a By spreading weight across the rope b By shortening the rope c By increasing weight 13 What defines a complex machine? a A purely electronic device b A single simple device c Two or more simple machines working together 14 Give an example of a complex machine. a Hammer b Bicycle or drill c Simple lever 15 Name a simple machine example. a Gear train b Lever or wheel and axle c Pulley system 16 Which item uses pulley mechanisms? a Gear clock b Car engine c Elevator 17 Which items use gear mechanisms? a Crane hook b Wall clock, bicycle, cars c Rope pulley only 18 One positive environmental impact of simple machines? a Cause high pollution b Require large power plants c Use less energy and simpler design 19 One negative environmental impact of complex machines? a Always rely on solar power b Never use resources c They may consume electricity and fuel 20 Is a bicycle a simple or complex machine? a Complex (uses gears and levers) b Neither c Simple only 21 Is a flagpole example of a pulley mechanism? a No b Only a gear system c Yes 22 Which is an example of a gear system? a Wall clock b Elevator rope c Flagpole 23 What is the environment impact of complex machinery's electricity use? a Positive: always green b No impact at all c Negative: can cause pollution, depends on energy source 24 What happens to torque when gears are changed to a higher ratio? a Torque typically increases while speed decreases b Torque decreases and speed increases c No change in torque

Simple and Complex Machines Grade 4

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Simple and Complex Machines Grade 4Versión en línea

por Ashish Malviya

What is the meaning of a mechanism in machines?

What does linear mean in motion terms?

Define torque.

What does rotary describe?

Input in a mechanism refers to what?

Output is best described as?

What is a gear system?

Gears in a system can change what aspect?

What is a gear ratio?

Where are gear systems commonly used?

What is a pulley system?

How does a pulley system reduce effort?

What defines a complex machine?

Give an example of a complex machine.

Name a simple machine example.

Which item uses pulley mechanisms?

Which items use gear mechanisms?

One positive environmental impact of simple machines?

One negative environmental impact of complex machines?

Is a bicycle a simple or complex machine?

Is a flagpole example of a pulley mechanism?

Which is an example of a gear system?

What is the environment impact of complex machinery's electricity use?

What happens to torque when gears are changed to a higher ratio?