What is first law motion?
Newton’s first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. This postulate is known as the law of inertia.
What is the example of first law of motion?
Place a ball in a box and slowly push the box. Abruptly stop the box. The ball will keep moving. According to Newton’s first law, an object in motion tends to stay in motion unless acted upon by an unbalanced outside force, so the ball keeps rolling even though the box has stopped.
What is Newton’s first law of motion answer key?
that an object in motion will remain in motion. that an unbalanced force can change the velocity of an object.
Which statements describe Newton’s first law?
1st Law – An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity, unless acted upon by an unbalanced force. 2nd Law – Force equals mass times acceleration. 3rd Law – For every action, there is an equal and opposite reaction.
What law is known as the law of action reaction?
Newton’s third law states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction. The third law is also known as the law of action and reaction.
What is the normal reaction?
A force acting perpendicular to two surfaces in contact with each other. If weight is the only vertical force acting on an object lying or moving on a horizontal surface, the normal reaction force is equal in magnitude, but opposite in direction to the weight.
What is normal friction?
Vocabulary. friction: A force that opposes two objects sliding against each other. Friction acts in a direction along the flat surface of an object. normal force: The force exerted by the ground or other object that prevents other objects from going through it.
What causes the normal force?
The normal force arises from the electromagnetic force; specifically, the electrons in the book push against the electrons in the table. Since the electrons don’t want to get any closer to each other, the book stays on top of the table. The normal force is closely related to the friction force.
Can a normal reaction be negative?
The normal reaction force is the force the ground exerts on the object to prevent the object from sinking into the ground. It can be zero. In which case, it would means that the object is floating just above the surface, not really touching it. But it cannot be negative.
Why is normal force negative?
Explanation: Normal force is defined as the force that a surface exerts on an object. If the object is at rest, net force on the object is equal to zero; therefore, the downward force (weight) must be equal to the upward force (normal force). Since weight acts in the downward direction it will be negative.
Is work done by normal force always zero?
No, the work done by normal forces is not always zero. In fact many common situations involve a normal force doing work. So in problems of blocks sliding down inclined planes, for example, the normal force of the plane on the block does no work because there is no motion in the direction of that normal force.
What is the weakest fundamental force?
Though gravity holds planets, stars, solar systems and even galaxies together, it turns out to be the weakest of the fundamental forces, especially at the molecular and atomic scales.
What is the strongest force on earth love?
When scientists looked for a unified theory of the universe they forgot the most powerful unseen force. Love is Light, that enlightens those who give and receive it. Love is gravity, because it makes some people feel attracted to others.
Where is gravity the strongest?
Arctic Ocean
What is value of G?
Its value is 9.8 m/s2 on Earth. That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2. When discussing the acceleration of gravity, it was mentioned that the value of g is dependent upon location. There are slight variations in the value of g about earth’s surface.
What is G called?
The gravitational constant G is a key quantity in Newton’s law of universal gravitation….Gravitational constant.
| Values of G | Units |
|---|---|
| 4.×10−3 | pc⋅M⊙–1⋅(km/s)2 |
What is G called and why?
G is called Universal Gravitation Constant because its value i.e. 6.67 x 10-11 Nm2kg-2 is constant thought the universe.
What is value of g’on moon?
approximately 1.625 m/s2
Why G is called a universal constant?
G is called universal constant becuase its value remains the same throughout the universe and is independent of masses of the objects. Answer: Capital G will be constant become the value of the G will be constant anywhere in the Universe.