1.a. What are the units of mass and the units of weight for the metric system? 1

Question

1.a. What are the units of mass and the units of weight for the metric system?

1.b. What are the units of mass and the units of weight for the English system?

2. Explain the relationship between the mass and the weight of an object. Is the mass of an object the same on earth and the moon? Are the weights the same on earth and the moon?

3. In your own words, explain Newton's second law of motion and give two examples.

4. How does mass affect the rate of acceleration in free fall: a. In air? b. In a vacuum?

5. If the mass of a sliding block is tripled while a constant net force is applied, by how much does the acceleration decrease?

6. Explain the difference between a vector and a scalar quantity.

7. Give at least two examples of different variables that are vector and scalar quantities.

8. Give an example of Newton's third law of motion and explain why it is an exampl

Explanation / Answer

1)a mass kg weight is NEwton b)mass as slug weight pound 2)weight=mg mass of object is same on earth and moon but weight is different due to gravity constant...... Mass is a measure of the amount of material in an object, being directly related to the number and type of atoms present in the object. Mass does not change with a body's position, movement or alteration of its shape, unless material is added or removed. Weight is the gravitational force acting on a body mass. Transforming Newton's Second Law related to the weight as a force due to gravity can be expressed as 3)The actual law is F = d(mv)/dt This means the force on a body is proportional to the change in momentum of the body with respect to time. However, usually we assume the mass (m) to be constant, so that simplifies the equation to F = m*dv/dt This means the force on a body is proportional to the product of the mass of the body (assume no changing with time) and the change in velocity with respect to time. Since the change in velocity with respect to time (dv/dt) is the acceleration of the body, then we can further simplify it: F = m * a Where F is the force on the body and is proportional to the mass of this body times the acceleration it's going. Examples: Let's say you see a soccer ball and you kick it with you foot. The soccer ball, which weighs about 0.4kg, is accelerating initially at 2m/s after you kicked it. The corresponding force your foot exerted on the ball is 0.4kg * 2m/s = 0.8N. 4)it does not affect it, except in air there is a friction/drag force opposing acceleration so it is slowed. So in a vacuum mass will not matter. in the air it will because more massive objects will have greater force behind them which reduces the effect of the opposing drag force 6)Scalar has only value. Vector has both value and direction. An aero plane's travel from Chennai to Bangalore is a vector quantity, The temperature of a glassful of milk is scalar quantity. 8)Newton's Third Law: For every Action there is an Equal and Opposite Reaction Examples: -- If you throw a heavy ball or block away from your body, the force exerted will push back on you, possibly pushing you backward onto the ground. -- You find it hard to walk on a slippery surface because the only way you can walk forward is for your foot to push backward on the surface of the ground. Through friction, the ground is essentially "pushing back" against the force of your step. -- A rocket can be launched into space because the hot gases from it are being propelled downward from the rocket, causing the rocket to move upward with equal force. (Gravity, of course, is opposing its acceleration during this reaction.)think of the recoil in a gun when firing a bullet.. the action is the bullet, the equal and opposite reaction is the recoil.. or even take for example pushing someone while standing on oil/ice. the action is that person moving due to your push, the reaction is you moving/falling in the opposite direction yourself.

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