Understanding Mechanical Devices for Movement

Delve into the world of mechanical devices used to generate movement, focusing on levers as a critical mechanism for creating mechanical advantage. Learn about the different classes of levers, their applications, and how they enhance efficiency in various tools and equipment. Explore concepts such as velocity ratio and efficiency to deepen your understanding of mechanical systems and their functionality.

• Mechanical devices
• Levers
• Movement
• Efficiency
• Velocity ratio

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1. Core Knowledge 1.5 Mechanical devices used to produce movement Name: Group: Teacher:

2. 1.5 Mechanical devices used to produce movement Pages 25 - 32 What are mechanisms? The four basic types of movement

3. 1.5 Mechanical devices used to produce movement Pages 25-32 Classification of levers Levers are simply mechanisms that create mechanical advantage, for example when moving large objects. Levers have 3 parts: 1) 2) 3) Homework: Count the levers in your home. Identify which class of lever the are, and explain your reasoning for your choice. Explain Mechanical Advantage:

4. 1.5 Mechanical devices used to produce movement Pages 25-32 Class 1,2 and 3 levers: Complete the table below including the drawings (page 26) Class 1 Class 2 Class 3 Reason for mechanical advantage Example Pliers or crowbar Wheelbarrow or nutcracker Tweezers or spade

5. 1.5 Mechanical devices used to produce movement Pages 25-32 Explain Velocity Ratio: ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ What is Efficiency? ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ In the same class 2 lever, the wheelbarrow handles are lifted 800mm while the load is only raised by 100mm. What is the velocity ratio? (page 26) Load raised: 100mm Effort raised: 800mm 50N E 300N Related image Fulcrum L

6. 1.5 Mechanical devices used to produce movement Pages 25-32 Draw a Bell crank and explain what it is below: CAMS: convert rotary motion into reciprocating and oscillating motion What are the three stages of movement: Apply it (page 28) Draw the profile of a cam that would create a uniform rise and a sudden fall in a cam follower. What is it s name? Key terms: Cam: a mechanism for converting rotary motion into reciprocation or oscillating motion. Follower: a device that follows the movement of a cam profile to provide a desired output in a connecting part. Friction: the resistance to movement between two surfaces that are trying to slide against each other. Friction generates heat.

7. 1.5 Mechanical devices used to produce movement Pages 25-32 Explain: Pulleys and belts: ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ V belt ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ Velocity Ratio ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ Cranks and sliders ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ Name:______________________ Year 10 Core Knowledge

8. 1.5 Mechanical devices used to produce movement Pages 25-32 Apply it Name the 4 types of movement: Add photos and annotate any practical work completed through this module of mechanical devices. Apply it What is a rack and pinion? (see page 31) Name:______________________ Year 10 Core Knowledge