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. Increase the change in momentum, and decrease the time duration.
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.
Where is the center of gravity of the broom that Dr?
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.
Which energy production method does not ultimately depend on the sun?
When two vehicles collide momentum is conserved?
An inelastic collisions occurs when two objects collide and do not bounce away from each other. Momentum is conserved , because the total momentum of both objects before and after the collision is the same. However, kinetic energy is not conserved .
When cannonball fired from a cannon the momentum?
Momentum is conserved in collisions and explosions . Conservation of momentum explains why a gun or cannon recoils backwards when it is fired . When a cannon is fired , the cannon ball gains forward momentum and the cannon gains backward momentum . Before the cannon is fired (the ‘event’) the total momentum is zero.
Why can’t you stand with your heels and back to a wall?
Why can’t you stand with your heels and back to a wall and then bend over to touch your toes and return to your stand -up position? A vertical line through the center of gravity of your body is in front of the tips of your toes, which is outside your support base. To them you move in a straight line.
What happens the first time Dr Hewitt lifts the bowling ball near his teeth and lets go view available hint’s what happens the first time Dr Hewitt lifts the bowling ball near his teeth and lets go the ball leaves?
Why does the bowling ball behave the way it does the first time Dr . Hewitt lifts the bowling ball near his teeth and lets go ? 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.
Why is a meter stick easier to balance than a ruler?
The more weight on your finger, the greater the force of friction. Once you change the weight anywhere on the ruler , the centre of gravity changes too. When you balance the ruler or metre stick on its end, it’s easier to find the balance point, but harder to keep the stick balanced .
What happens to the force of attraction between two planets when the masses of both are doubled?
Terms in this set (20) What happens to the force of attraction between two planets when the masses of both are doubled ? The force decreases to one quarter.
How do clockwise and counterclockwise torques compare when a system is balanced?
How do clockwise and counterclockwise torques compare when a system is balanced ? They are equal in magnitude and opposite in direction. If you toss a stick into the air, it appears to wobble all over the place.
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 ? The Space Shuttle is much farther away from the center of the Earth than the surface of the Earth . The Space Shuttle is much closer to the center of the Earth than the surface of the Earth .
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.)
When a simple machine multiplies force it decreases?
When a simple machine multiplies force, it decreases the distance moved.
What is the relationship between the gain in kinetic energy and the work when work is done?
The principle of work and kinetic energy (also known as the work – energy theorem) states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle.