# FORCE AND LAWS OF MOTION PDF

In the previous chapter, we described the motion of an object along a straight line in terms of its position, velocity and acceleration. We saw that such a motion. motion. Newton's third law of motion. Conservation of momentum. Equilibrium of a particle. Common forces in mechanics. Circular motion. Force (Definiton # 1). The vis insita: an innate forces of matter, is a power of resisting, by which every body, as much as in it lies, continues in its present state, .

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Concept of Force and. Newton's Laws of Motion. W02D2. Chapter 7 Newton's Laws of Motion,. Sections Chapter 8 Applications of Newton's. Force. • A Short Catalog of Forces. • Identifying Forces. Chapter 5. Force and Motion . development of his three Laws of motion, the Law of gravitation, the. examples of forces are gravity, friction, magnetism, and applied forces. Forces cause an (Newton's 1st Law of Motion; “Law of Inertia”). GRAVITY: is the force.

This, too, turns out to be quite simple I wonder why….

For the same force, an object with twice the mass will have half the acceleration. If it had three times the mass, the same force will produce one-third the acceleration.

Four times the mass gives one-fourth of the acceleration, and so on. This type of relationship between quantities double one, get half the other is called an inverse proportion or inverse variation. Thus, if the colliding objects have unequal mass, they will have unequal accelerations as a result of the contact force which results during the collision. Forces are interactions between objects, like conversations are interactions between people.

Single, isolated forces never happen.

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They are equal in magnitude. Both forces exist at exactly the same time.

## Forces and Laws of Motion-Notes

They both start at exactly the same instant, and they both stop at exactly the same instant. They are equal in time. The size of the force on the first object equals the size of the force on the second object. Unbalanced Forces: A force is applied in one direction and either another smaller or larger force is applied in the opposite direction or no force is applied at all in the opposite direction.

Unbalanced Forces If I have a chair and I push on one side of it with a force of 50 N and you push on the other side, with a force of 25 N, will the chair move?

Which way will it move? The direction in which the most force is applied.

What is the net force? 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. The direction of the acceleration is the same as the direction of the net force.

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The magnitude of the acceleration is directly proportional to the net force applied, and inversely proportional to the mass of the object. A force applied to an automobile will not have the same effect as the same force applied to a pencil.

## Car Basics – Sir Isaac Newton’s Laws of Motion

An automobile resists accelerating much more than a pencil does, because it has more inertia, or mass. The acceleration of an object depends not only on how hard you push on it, but also on how much the object resists being pushed.

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What is the effect of mass on acceleration? This, too, turns out to be quite simple I wonder why…. For the same force, an object with twice the mass will have half the acceleration.

If it had three times the mass, the same force will produce one-third the acceleration. Four times the mass gives one-fourth of the acceleration, and so on. This type of relationship between quantities double one, get half the other is called an inverse proportion or inverse variation.

In other words, then:. For which situation is the vertical velocity zero? A railroad train travels forward along a straight track at The distance of the Earth from the Sun is 93,, miles.

If there are 3. A ball is thrown vertically upwards at 9. For its complete trip up and back down to the starting position , its average velocity is: a. Changing the positive direction in a reference frame to the opposite direction does not change the sign of which of the following quantities?

If so, what is the acceleration? What is the speed after the first 5. An x-t graph is drawn for a ball moving in one direction. A v-t graph is drawn for a ball moving in one direction. A g ball traveling at A high-speed camera records this event.

## myCBSEguide

If the ball is in contact with the wall for 3. An object is dropped from a height. Once it is moving, which of the following statements is true, at least at one point? Its velocity is more than its acceleration.

Its velocity is less than its acceleration. Its velocity is the same as its acceleration.

Its velocity is never equal to its acceleration. The slope of the acceleration-time curve represents: a. A strobe photograph shows equally spaced images of a car moving along a straight road.

If the time intervals between images is constant, which of the following cannot be positive? A strobe photograph of a car moving along a straight road shows the interval between each successive image to be diminishing. If the direction of motion of the car is taken as positive, which of the following are negative?

A ball is pushed downhill with an initial velocity of 3. The ball rolls down a hill with a constant acceleration of 1. The ball reaches the bottom of the hill in 6. What is the final velocity after 11 s? What is its acceleration? In the case of constant acceleration, the average velocity equals the instantaneous velocity: a. A particle moves east at constant velocity for a time interval t.

It then moves north at a constant velocity, with the same speed as before, for another time interval t Finally it moves east again with the original velocity. At the instant an additional time interval t has elapsed, which of the following are true about the average velocity and the average acceleration for the motion described?

The average velocity is and the average acceleration is zero. The average velocity is and the average acceleration is not zero. The average velocity is not and the average acceleration is zero. The average velocity is not and the average acceleration is not zero. The first displacement is 7 m and the second displacement is 3 m.

They cannot add together to give a total displacement of: a. An object, initially moving in the negative x direction, is subjected to a change in velocity in the negative y direction. If the resulting velocity vector is drawn from the origin, into which quadrant does this vector point? None, since the object is now moving in the negative y direction. Which of the following best describes the orientation of the average acceleration during this time interval?An object is dropped from a height.

A force is applied in one direction and either another smaller or larger force is applied in the opposite direction or no force is applied at all in the opposite direction.

The direction of the force on the first object is opposite to the direction of the force on the second object.

## Science Class 9 - Videos, Docs, MCQs

The train is slowing down. The size of the force on the first object equals the size of the force on the second object. Suppose a particle is moving along a straight line with a speed v for a time t, then stops for a time t, and then resumes moving along the original direction with speed v for time t. Mass is the measurement of inertia. On a position-time graph for a particle, suppose the plot starts at some positive position and as the time goes on the curve gets steeper and steeper while curving upwards.

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