Calculating Work Done in Pushing a Lawn Mower: A Physics Problem

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In summary, a woman pushing a lawn mower with a force of 400 N at an angle 45 degrees below the horizontal for a displacement of 12 meters, with a coefficient of friction of 0.1, results in a work of -294J. However, a free body diagram is needed to determine the correct normal force.
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master_333
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Homework Statement


A woman pushes a lawn mower(25-kg) with a force of 400 N at an angle 45 degrees below the horizontal for a displacement of 12 meters. The coefficient of friction between the lawn and the mower is 0.1. The answer is -634 J but I get a different answer.

Homework Equations


W = F (d)

The Attempt at a Solution


W = -(coefficient of friction) (mg) (12 m)
W = - 0.1 * 25 * 9.8 * 12
W = -294J
 
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  • #2
master_333 said:

Homework Statement


A woman pushes a lawn mower(25-kg) with a force of 400 N at an angle 45 degrees below the horizontal for a displacement of 12 meters. The coefficient of friction between the lawn and the mower is 0.1. The answer is -634 J but I get a different answer.

Homework Equations


W = F (d)

The Attempt at a Solution


W = -(coefficient of friction) (mg) (12 m)
W = - 0.1 * 25 * 9.8 * 12
W = -294J
You should draw a free body diagram of the lawn mower with the woman pushing it, in order to find the correct normal force.
 
  • #3
Thank you very much that helped a lot. I realized my mistake.
 

FAQ: Calculating Work Done in Pushing a Lawn Mower: A Physics Problem

1. How do lawn mowers work?

Lawn mowers work by using a motor or engine to power a rotating blade that cuts the grass. The blade spins at a high speed and cuts the grass evenly as the lawn mower is pushed or driven over the lawn.

2. What type of fuel do lawn mowers use?

Most lawn mowers use gasoline as fuel, although some models may use electricity or rechargeable batteries. Gasoline-powered lawn mowers typically have a fuel tank that needs to be filled before use.

3. Can lawn mowers be used on all types of grass?

Lawn mowers can be used on most types of grass, but it is important to adjust the cutting height and blade sharpness according to the type of grass in your lawn. Some lawn mowers also have different settings or attachments for different types of grass.

4. How often should lawn mowers be serviced?

Lawn mowers should be serviced at least once a year, preferably before the start of the mowing season. This includes changing the oil, air filter, and spark plug, as well as cleaning or replacing the cutting blade. Regular maintenance will ensure that your lawn mower runs smoothly and efficiently.

5. Are there any safety precautions to take when using a lawn mower?

Yes, there are several safety precautions to take when using a lawn mower. These include wearing protective equipment such as closed-toe shoes, long pants, and safety glasses. It is also important to read the manual and follow all instructions, never remove safety guards or shields, and never leave a running lawn mower unattended.

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