## What happens the third time Dr Hewitt lifts the bowling ball near his teeth — the time when he gives it a push?

Hewitt lifts the bowling ball near his teeth and gives it a push? The ball leaves Dr. The extra energy from the push is converted into kinetic energy, which is then converted into more potential energy at the end of the motion than the ball had when it was released.

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## How does Dr Hewitt break the piece of wood?

How does Dr. Hewitt break the piece of wood? He causes a change in momentum of his hand over a short period of time.

## Where is the center of gravity on the broom that Dr Hewitt holds up?

Where is the center of gravity of the broom that Dr. Hewitt holds up? The shorter side, where the bristles of the broom are, has a greater weight than the handle.

## Why does the rotational inertia of the rod with the attached mass closer to your hand?

Why does the rotational inertia of the rod with the attached mass closer to your hand compare the way it does with the rotational inertial of the rod with the attached mass farther away? Rotational inertia depends on whether the mass is farther or closer to the point of rotation.

## Why is it easier to stop a lightly loaded truck than a heavier one that has equal speed?

It is easier to stop a lightly loaded truck than a heavier one moving at the same speed because it has less KE and will therefore require less work to stop. (An answer in terms of impulse and momentum is also acceptable.)

## Why do you do no work on a 25 kg backpack when you walk a horizontal distance of 100 m?

Why do you do no work on a 25 kg backpack when you walk a horizontal distance of 100 m? You do no work because the backpack moves relative to you. Although no work is done on the wall, work is nevertheless done on internal parts of your body. Two people who weigh the same climb a flight of stairs.

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## Which case requires greatest impulse?

The impulse required is greatest when the ball is caught and then thrown back because the impulse required equals the change in momentum.

## Why does the bowling ball behave as it does when Dr Hewitt lifts it and gives it a push?

Why does the bowling ball behave as it does when Dr. Hewitt lifts it and give it a push? the extra energy from the push is converted into kinetic energy, which is then converted into more potential energy at the end of the motion than the ball had when it was released.

## Which has more momentum after firing the cannonball are the recoiling cannon?

After the firing occurs, both the cannon and cannonball have the same momentum (big mass, small velocity vs. small mass, big velocity). But since the momentum for each is moving in the opposite direction, the momentums cancel out, causing the cannon-cannonball system’s momentum to equal zero.

## Why does a typical small helicopter with a single main rotor have a second small rotor on its tail?

Why does a typical small helicopter with a single main rotor have a second small rotor on its tail? The helicopter and main rotor would rotate in the opposite directions. The smaller rotor provides a torque to offset the rotational motion that the helicopter would otherwise have.

## Why does the gravity in the space shuttle compare with the gravity on Earth the way it does?

Why does the gravity in the Space Shuttle compare with the gravity on Earth the way it does? There is no gravity in the Space Shuttle because it is too far away from the center of the Earth. The Space Shuttle is in free fall, so the shuttle and the astronauts inside it are continuously falling toward the Earth.

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## What is required to change the angular momentum of a system?

The change of angular momentum can be brought about by the application of a net torque on the body

## Is angular momentum always conserved?

In physics, angular momentum (rarely, moment of momentum or rotational momentum) is the rotational equivalent of linear momentum. It is an important quantity in physics because it is a conserved quantity —the total angular momentum of a closed system remains constant.

## Why is it easier to balance a broom than a pencil?

Your pencil has less mass so will change direction relative to your finger much faster than a broom can do so. Your reactions can easily keep up with the slower broom as it wobbles around – the pencil though is going to win more often than not.

## Is it easier to balance a long rod with a mass?

Rotational inertia depends on whether the mass is farther or closer to the point of rotation. The farther the mass is, the higher the rotational inertia. It is easier for the performer to balance a long rod held vertically with people at the other end because the rotational inertia is greater.