Two different objects are moving at the same speed;the smaller object is difficult to stop

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TRUE/FALSEDirections: Read each statement below carefully. Write T on the space before the mumber ifyou think the statement is TRUE and write F, if you think the statement is FALSE,the space before the one1. An object which is moving at a constant speed has momentum.2. Two objects of different mass are moving at the same speed; the more massive objectwill have the greatest momentum,3. A less massive object can never have more momentum that a more massive object.4. Two different objects are moving at the same speed. The larger object is difficult tostop.5. An object with a changing speed will have a changing momentum,6. Objects involved in collisions encounter impulses.7. Impulse is the force needed to produce a change in the body's momentum throughcombination of changes in its mass and/or velocity7. An object which experiences a net impulse will definitely experience a momentumchange.8. In a collision, the impulse experienced by an object is not equal to its momentumchange9. Two cars with the same mass collided but having different velocity. Car Btravelsfaster than car A. Therefore, Car A has greater momentum change than Car B.10. Two objects collide. Object A has greater mass and velocity while Object B hassmaller mass and yelocity. In this case, Object A has greater change of momentumor impulse.

Momentum is another vector measurement. Momentum is in the same direction as velocity. Scientists calculate momentum by multiplying the mass of the object by the velocity of the object. It is an indication of how hard it would be to stop the object. If you were running, you might have a mass of 50 kilograms and a velocity of 10 meters per second west (really fast). Your momentum would be 500 kg-m/sec west. Easy as pi.

Remember Newton's First Law? It said that any object moving will continue moving unless it is interfered with. That idea applies to momentum as well. The momentum of an object will never change if it is left alone. If the 'm' value and the 'v' value remain the same, the momentum value will be constant.

The momentum of an object, or set of objects (system), remains the same if it is left alone. Within such a system, momentum is said to be conserved.

Here's the momentum idea in simpler terms. When you throw a ball at someone and it hits him hard, it hurts because it was difficult to stop (had momentum).Think about it. If you throw a small ball and a large ball at the same speeds, the large ball will hit a person with a greater momentum, be harder to stop, and hurt more. When the mass is greater (at the same speeds), the momentum is greater. A bullet is an example of an object with a very small mass that has a lot of momentum because it is moving very quickly. Bullets are therefore difficult to stop; it's a good idea not to try!

Conserving Momentum

We already told you that the momentum of an isolated object (or system of objects) is conserved. If the net force acting on an object is zero, then the linear momentum is constant. In an elastic collision (such as a superball hitting and rebounding from the ground), no kinetic energy is lost. All of that energy is still in the object, so we say that energy was conserved. If the kinetic energy didn't change, then neither did the value of the momentum (The momentum vector, however, DID change, since the direction of momentum changed.). Energy is a scalar, not a vector, so a direction change doesn't matter.

What about an inelastic collision? In an inelastic collision, some of the energy will be lost to heat or sound or light or some other energy. The thing to remember is that the total energy didn't change, but some of it escaped into the air, ground, etc. The object would then have less energy when it rebounded, so the KE and momentum would be less. The total energy is the same, but the energy of the object did not remain the same. The energy of the object was not conserved, but the total energy was.

Try throwing a piece of clay on the ground. When the clay slams into the ground, some of the kinetic energy of the clay was lost as heat and sound to the ground and air, and some of the heat remains in the clay. Since the velocity became zero, so did the momentum. The energy is still around, but divided up in different places.

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How Pulleys Work (NASA-eClips Video)

Varying the amount of force or mass of an object affects the speed, direction, shape or orientation of an objects motion.

Speed

Speed is a measure of how fast something moves a particular distance (for example, meters) over a given amount of time (for example, seconds).
Therefore, speed is the rate of change of the position of an object, or how far something will move in a given period of time.
Speed does not necessarily mean that something is moving fast.

Force

If an object is in motion and more force is applied to it, the object will begin moving faster.
If two objects have the same mass and a greater force is applied to one of the objects, the object which receives the greater force will change speeds more quickly. For example if a ball is hit harder, it will speed up faster.
If an object must be slowed down quickly, the force applied to the object must be greater than what is needed for a gradual slowing down. For example, the greater the force applied to the brakes of a bicycle, the more quickly it will slow down or stop.
Varying the amount of force applied to a moving object can also change the direction that the object is moving more or less quickly. For example, a baseball pitched toward the batter may quickly change direction and speed if hit very hard, or may change direction and speed more slowly if hit softly as with a bunt.

If two objects have the same mass and a greater force is applied to one of the objects, the object which receives the greater force will change speeds more quickly. For example if a ball is hit harder, it will speed up faster.

A baseball pitched toward the batter may quickly change direction and speed if hit very hard, or may change direction and speed more slowly if hit softly as with a bunt.

Mass

If a heavy (more massive) object is in motion, more force must be applied to get the object moving faster.
If the same force is applied to two objects, the object with the smaller mass will change speeds more quickly. For example if a baseball and a bowling ball are thrown with the same force the baseball will speed up faster.
In order to slow down or stop a heavier (more massive) object, the force on that object must be greater than for a less massive object. For example, if the same braking force is applied to a small car and a large truck, the car will slow down more quickly.
It is more difficult to change the direction of a heavy moving object, than one that is lighter in mass.

If the same force is applied to two objects, the object with the smaller mass will change speeds more quickly. For example if a soccer ball and a bowling ball are thrown with the same force the soccer ball will speed up faster.

The lighter ball (the baseball) is accelerating more than the heavier ball (the bowling ball). The bowling ball is hit with the same amount of force as the baseball but the baseball goes farther because the lighter mass has a larger acceleration.