Newton 3 is about equal and opposite !
The nail exerts an equal force on the hammer in the opposite direction.
If I push the nail forward it pushes BACK on me,
Please check my answers
A hammer is used to hit a nail into a board. Which statement is correct about the forces at play between the nail and the hammer?
The nail exerts a much smaller force on the hammer in the opposite direction.
The nail exerts a much smaller force on the hammer in the same direction.
The nail exerts an equal force on the hammer in the same direction.****
The nail exerts an equal force on the hammer in the opposite direction.
A person is being pulled by gravity with a force of 500 N. What is the force with which the person pulls Earth?
1,000 N
100 N
500 N****
250 N
A magnet pulls a piece of iron with a force of 1 N. What is the force that the iron piece exerts on the magnet?
The iron piece exerts a force of 1 N divided by the ratio of the weight of the iron piece to the weight of the magnet in the same direction.
The iron piece exerts a force of 1 N on the magnet in the same direction. ****
The iron piece exerts a force of 1 N on the magnet in the opposite direction.
The iron piece exerts a force of 1 N divided by the ratio of the weight of the iron piece to the weight of the magnet in the opposite direction.
Which statement is correct about the rotational inertia of a rotating object?
When mass moves closer to the point of rotation, rotational inertia decreases.
Rotational inertia is always decreasing because angular momentum is conserved.
When mass moves closer to the point of rotation, rotational inertia increases.
Rotational inertia is conserved because it is resistance to change in rotational motion. ****
A figure skater who is spinning suddenly opens up his arms. Which statement is correct about the rotation of the skater?
The skater spins slower because his rotational inertia has increased.
The skater spins faster because his rotational inertia has increased.****
The skater spins faster because his rotational inertia has decreased.
The skater spins slower because his rotational inertia has decreased.
6 answers
The iron piece exerts a force of 1 N on the magnet in the opposite direction.
SAME PROBLEM
If the magnet pulls the iron up, the iron pulls the magnet down.
SAME PROBLEM
If the magnet pulls the iron up, the iron pulls the magnet down.
The skater spins slower because his rotational MOMENT OF INERTIA has increased.
Angular momentum is conserved.
L =angular momentum = I * omega = Moment of inertia * angular velocity
Moment of inertia = sum of all the masses times square of distances from rotation axis
When arms go out, Moment of inertia increases
so
omega must DECREASE to keep product, I * omega constant.
Besides, you know perfectly well that is the skater pulls her arms IN, she speeds up :)
Angular momentum is conserved.
L =angular momentum = I * omega = Moment of inertia * angular velocity
Moment of inertia = sum of all the masses times square of distances from rotation axis
When arms go out, Moment of inertia increases
so
omega must DECREASE to keep product, I * omega constant.
Besides, you know perfectly well that is the skater pulls her arms IN, she speeds up :)
Thank so much!
answers are
1. "The nail exerts an equal force on the hammer in the opposite direction."
2. "500 N"
3. "The iron piece exerts a force of 1 N on the magnet in the opposite direction."
4. "When mass moves closer to the point of rotation, rotational inertia decreases."
5. "The skater spins slower because his rotational inertia has increased."
1. "The nail exerts an equal force on the hammer in the opposite direction."
2. "500 N"
3. "The iron piece exerts a force of 1 N on the magnet in the opposite direction."
4. "When mass moves closer to the point of rotation, rotational inertia decreases."
5. "The skater spins slower because his rotational inertia has increased."
anna is 100% correct
1 answer