Gravitational Force, Attraction, and Mass Quick Check

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Question
A high school athlete is in the weight room training for wrestling season. He is trying to bench press a bar loaded with 100 kg. How much force must he exert to lift the loaded bar and overcome the force of gravity?
Remember that a= 9.8 m/s 2
.(1 point)
Responses

9800 N
9800 N

109.8 N
109.8 N

10.2 N
10.2 N

980 N
980 N
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1 answer

To determine the force the athlete must exert to lift the loaded bar, you can use the formula for gravitational force:

\[ F = m \cdot g \]

where:

  • \( F \) is the force (in newtons, N),
  • \( m \) is the mass (in kilograms, kg),
  • \( g \) is the acceleration due to gravity (approximately \( 9.8 , \text{m/s}^2 \)).

In this case, the mass \( m \) is 100 kg. Plugging in the values:

\[ F = 100 , \text{kg} \cdot 9.8 , \text{m/s}^2 \] \[ F = 980 , \text{N} \]

Therefore, the athlete must exert a force of 980 N to lift the loaded bar and overcome the force of gravity.

So the correct answer is:

980 N