Terms in this set (19) When a ball falls downward, it may have a net force: of zero.

The velocity of the cannonball is equal and opposite to the velocity of the cannon.

When a cannonball is fired from a cannon, which undergoes the greater acceleration? 260 N. 0.8 m/s2. How does the magnitude of F relate to the vector sum of mg and N when the shoe is in equilibrium?

The cannonball undergoes more acceleration than the cannon because its mass is much smaller. Interestingly enough, in the interaction between the boulder and Earth, shown in Figure 7.6, the boulder pulls up on Earth with as much force as Earth pulls down on the boulder.

when a cannon is fired, are the forces on the cannonball and on the cannon equal in magnitude? are the accelerations of the two equal? the forces are equal. though the acceleration is not.

There are 6 forces exerted. Which is most important in winning in a tug-of-war; pulling harder on the rope, or pushing harder on the floor? Pushing harder on the floor. The paper isn’t capable of exerting a reaction force.

Inside a baseball, trillions of interatomic forces hold the ball together but play no role in accelerating the ball. They are part of action-reaction pairs within the ball, but they combine to zero. If the action-reaction forces are internal to the system, then they cancel and the system does not accelerate.

Does a stick of dynamite contain force? Explain. No. Force is not something an object has, like mass.

3. When you walk along a floor, what pushes you? The floor! You push on the floor, and the floor pushes back on you with equal and opposite force.

How does the force on the rifle compare with the force on the bullet, and why? The magnitude of the force of the rifle is equal to the magnitude of force on the bullet and the forces are in the opposite direction, because for every action there is an equal and opposite reaction.

How is Dr. Hewitt able to break a piece of wood in his demonstration? He moves his hand very quickly.

The Earth’s acceleration, a = Fnet/m = (6 x 102 N)/(6 x 1024 kg) = 10-22 m/s2 = 0.0000000000000000000001 m/s2!) When a rifle is fired, the force that the rifle exerts on the bullet (“action” force) is exactly the same size as the force the bullet exerts on the rifle (“reaction” force).

1. A gun recoils when a bullet is fired from it: When a bullet is fired from a gun, the gun exerts a force on the bullet in the forward direction. This is the action force. The bullet also exerts an equal force on the gun in the backward direction.

When a bullet is fired from a gun, the gun exerts a force on the bullet in the forward direction. The bullet also exerts an equal and opposite force on the gun in the backward direction. Therefore a gun recoils when a bullet is fired from it.

Answer: Explanation: When a bullet is fired from a gun, the force sending the bullet forward is equal to the force sending the gun backward (Newton’s third law of motion). But, due to the high mass of the gun, it moves only by a small distance backwards and gives a backward shock to the shoulder of the gunman.

If you push on anything, it pushes back on you. That’s why if you lean against the wall, you don’t just fall through it. The wall pushes back on you as hard as you push on it, and you and the wall stay in place.

Particles from empty space Quantum mechanics tells us that there is no such thing as empty space. Even the most perfect vacuum is actually filled by a roiling cloud of particles and antiparticles, which flare into existence and almost instantaneously fade back into nothingness.

Here’s The Reason You Can’t Actually Walk Through Walls, According to Science. You’ve probably heard that the atoms that make up your body and all other normal matter in the Universe are mostly empty space. Solid enough the elements in our atoms can’t just pass through the empty spaces of other atoms, and vice versa.

A: Usually, matter can easily pass through other matter. Even very familiar types of matter (electrons, positrons, protons, neutrons, helium nuclei) pass through familiar matter to some degree, which is why transmission electron microscopes, neutron scattering experiments, proton radiation therapy, etc. work.

Beta particles penetrate matter more effectively than alpha particles. However, since beta particles are actually electrons, their electrical charge impedes their penetrating ability, and they quickly lose their energy, so that such materials as wood, plastic and aluminum can stop beta radiation.

1 gram of dark matter is worth $65.5 trillion.

As of now, the existence of any dark matter in the solar system remains as mysterious as its presence everywhere else.

No. Dark matter is a not yet fully understood particle that doesn’t interact with light and that accounts for the missing mass needed to explain observed gravitational effects. There is no scientific basis for the concept of a soul; that is a religious / belief / philosophy term…

Due to its explosive nature (it annihilates when in contact with normal matter) and energy-intensive production, the cost of making antimatter is astronomical. CERN produces about 1×10^15 antiprotons every year, but that only amounts to 1.67 nanograms.

Dark matter is dark: It emits no light and cannot be seen directly, so it cannot be stars or planets. Dark matter is not clouds of normal matter: Normal matter particles are called baryons.