To lift a car safely for changing a flat tire, the best choice among the options given is the **screw jack**.

### Explanation:
1. **Wedge**: This is a tool used primarily for splitting or lifting but is not designed for lifting heavy objects such as a car.
2. **Screw Jack**: This is specifically designed to lift heavy loads by turning a screw mechanism. It is commonly used in automotive applications.
3. **Claw Hammer**: This tool is intended for driving nails and removing them; it is not suitable for lifting.
4. **Ramp**: While ramps can be used to drive a car up for access to the underside, they do not lift a car vertically in the same way as a jack.

### Conclusion:
The **screw jack** is the appropriate machine for lifting a car to change a flat tire because it is designed for that specific purpose, making it the best choice in this scenario.

Question

To lift a car safely for changing a flat tire, the best choice among the options given is the **screw jack**.

### Explanation:
1. **Wedge**: This is a tool used primarily for splitting or lifting but is not designed for lifting heavy objects such as a car.
2. **Screw Jack**: This is specifically designed to lift heavy loads by turning a screw mechanism. It is commonly used in automotive applications.
3. **Claw Hammer**: This tool is intended for driving nails and removing them; it is not suitable for lifting.
4. **Ramp**: While ramps can be used to drive a car up for access to the underside, they do not lift a car vertically in the same way as a jack.

### Conclusion:
The **screw jack** is the appropriate machine for lifting a car to change a flat tire because it is designed for that specific purpose, making it the best choice in this scenario.

Knowee AI · Accepted Answer

To lift a car safely for changing a flat tire, the best choice among the options given is the **screw jack**.

### Explanation:
1. **Wedge**: This is a tool used primarily for splitting or lifting but is not designed for lifting heavy objects such as a car.
2. **Screw Jack**: This is specifically designed to lift heavy loads by turning a screw mechanism. It is commonly used in automotive applications.
3. **Claw Hammer**: This tool is intended for driving nails and removing them; it is not suitable for lifting.
4. **Ramp**: While ramps can be used to drive a car up for access to the underside, they do not lift a car vertically in the same way as a jack.

### Conclusion:
The **screw jack** is the appropriate machine for lifting a car to change a flat tire because it is designed for that specific purpose, making it the best choice in this scenario.

Which one of the following machines is used to lift a car to change a flat tyre?Question 8Answera.Wedgeb.Screw jackc.Claw hammerd.Ramp

Question

Which one of the following machines is used to lift a car to change a flat tyre?

Solution

Explanation:

Conclusion:

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