Question

I need help with these Physics questions (they are supposed to be on Newtons 1st-3rd Laws). Thank you!

Answer 1

(a) Down

(b) Tennis ball

(c) The apple pulling up on the Earth
(d) 3 kg

Step-by-step explanation:

The questions you have attached as images are listed below in order:

• (a) An elevator is traveling up and slowing down. The Net Force acting on it must be pointed?

• (b) If the same force is applied to a light tennis ball and a huge truck, which will accelerate more?

• (c) A person hold the apple in their hand. If the action force is the earth pulling down on the apple, then the reaction force is?

• (d) A 6 N force accelerates an object at 2 m/s². Given the equation F = ma What number is equal to "m?"

To effectively answer your multipart physics question, I'll approach each part seperately, providing a concise yet comprehensive explanation for each segment.

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Part (a)
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When an elevator travels upwards and slows down, the direction of the net force is a crucial aspect to consider. In this scenario, the net force must be directed downwards. This is because the elevator's deceleration (slowing down) indicates that the force opposing its upward motion is greater than the force driving it upwards.

Thus, the second option is correct, down.

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Part (b)
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The question of whether a light tennis ball or a huge truck will accelerate more when the same force is applied involves Newton's second law of motion. According to this law, F = ma, a smaller mass will experience a greater acceleration when the same force is applied. Therefore, the light tennis ball will accelerate more than the huge truck.

Thus, the first option is correct, tennis ball.

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Part (c)
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Addressing the action-reaction forces when a person holds an apple involves Newton's third law of motion. If the action force is the Earth pulling down on the apple (gravity), then the reaction force is the apple exerting an equal and opposite force upwards against the Earth. This is often misconceived as the force of the hand holding the apple, but in Newtonian mechanics, action and reaction forces always involve the same two interacting objects.

Thus, the first option is correct, the apple pulling up on the Earth.

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Part (d)
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To find the value of "m" (mass) in the equation F = ma given a 6 N force and an acceleration of 2 m/s², we rearrange the equation to:

`\Longrightarrow m=(F)/(a)`

Now, substituting the given values, we have:

`\Longrightarrow m=\frac{6 \text{ N}}{2 \text{ m/s$^2$}}`

Calculating this will give us the mass:

`\therefore m = \boxed{3 \text{ kg}}`

Thus, the second option is correct, 3 kg.