3.1.2 Right Hand Rule and Torque
- Point your fingers in the direction of the perpendicular part of position vector r (as you would for x)
- Curl them towards the direction of the Force vector F (as you would for y)
- Your thumb is in the direction of the moment M that results from the force (as for z)
What is the direction of torque?
Torque is inherently a vector quantity. Part of the torque calculation is the determination of direction. The direction is perpendicular to both the radius from the axis and to the force. It is conventional to choose it in the right hand rule direction along the axis of rotation.
What is the right hand rule for magnetic force?
The right hand rule states that: to determine the direction of the magnetic force on a positive moving charge, point your right thumb in the direction of the velocity (v), your index finger in the direction of the magnetic field (B), and your middle finger will point in the direction of the the resulting magnetic force (F).
What is the torque direction of a crankshaft?
Notice that the torque direction, the axis, is perpendicular to the direction of the forces applied by your hand on the handle of the screwdriver crankshaft has torque clockwise or anticlockwise but not out of cranckshaft axis of rotation! The torque points in the same direction as the axis.
What is the right hand rule for cross product?
(pronounced “a cross b”) To apply the right hand rule to cross products, align your fingers and thumb at right angles. Then, point your index finger in the direction of vector a and your middle finger in the direction of vector b. Your right thumb will point in the direction of the vector product, a x b (vector c).
Why is torque right hand rule?
The direction of rotation is related to the direction of torque by a related right-hand rule. If you point your thumb in the direction of the torque, your fingers will curl in the direction of rotation. Clockwise rotation is caused by negative torques; counterclockwise rotation by positive torques.
What is the right hand rule in mechanics?
The rule is this: if a screw is right-handed (most screws are) point your right thumb in the direction you want the screw to go and turn the screw in the direction of your curled right fingers.
What are the 3 right hand rules?
4:587:40Right Hand Rule 1, 2 and 3 - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo let's look at our right hand rule number 3. This guy is used to find the force. Or direction ofMoreSo let's look at our right hand rule number 3. This guy is used to find the force. Or direction of our force on electric charge on a positive electric charge produced by magnetic field.
What rule determines the direction of torque?
The direction of the torque vector is found by convention using the right hand grip rule. If a hand is curled around the axis of rotation with the fingers pointing in the direction of the force, then the torque vector points in the direction of the thumb as shown in Figure 2.
How do we calculate torque?
To calculate load torque, multiply the force (F) by the distance away from the rotational axis, which is the radius of the pulley (r). If the mass of the load (blue box) is 20 Newtons, and the radius of the pulley is 5 cm away, then the required torque for the application is 20 N x 0.05 m = 1 Nm.
What's the unit for torque?
Newton-metreThe SI unit for torque is the Newton-metre or kgm2sec-2. How have we come to this? If we look at the formula Torque = Force X Distance. While distance is measured in metres and force is measured in newton, so torque is measured in newton ⋅ metres.
How do you use right-hand rule 2?
1:407:50Right Hand Rule # 2 - Magnetic Fields - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd you orient your thumb in the same direction as the current literally take your hand wrap itMoreAnd you orient your thumb in the same direction as the current literally take your hand wrap it around the wire. And look at the directions that your fingers are actually going.
What is right hand and left hand rule?
Fleming's left-hand rule is used for electric motors, while Fleming's right-hand rule is used for electric generators. In other words, Fleming's left hand rule should be used if one were to create motion, while Fleming's right hand rule should be used if one were to create electricity.
What does right-hand rule #1 Determine?
Right-Hand Rule #1 determines the directions of magnetic force, conventional current and the magnetic field. Given any two of theses, the third can be found. Using your right-hand: point your index finger in the direction of the charge's velocity, v, (recall conventional current).
Is torque always perpendicular to force?
Strictly speaking, torque is a vector quantity, which is always perpendicular to both radius and force; but for now, we'll describe torques by the direction they tend to rotate the object in question: clockwise or counter-clockwise.
Is torque in the same direction as force?
A torque produces a change in angular velocity which is called an angular acceleration. The distance L used to determine the torque T is the distance from the pivot p to the force, but measured perpendicular to the direction of the force.
What does torque depend on?
The magnitude of torque of a rigid body depends on three quantities: the force applied, the lever arm vector connecting the point about which the torque is being measured to the point of force application, and the angle between the force and lever arm vectors.
What is a right hand?
1a : the hand on a person's right side. b : an indispensable person. 2a : the right side. b : a place of honor.
What are the two right hand rules?
The second right hand rule deals with the magnetic field that is induced by current moving through a wire. Take your right hand, and wrap your fingers around the wire, with your thumb pointing in the direction that the current is flowing. Your fingers now represent the direction of the lines of magnetic force!
What is right-hand rule Class 10?
Thumb rules state that if thumb of the right hand points along direction of current, then the remaining curled , fingers of same hand gives the direction of the magnetic field due to the current. Solve any question of Moving Charges and Magnetism with:- Patterns of problems. > Was this answer helpful?
What is Fleming's right-hand rule used for?
What is Fleming's Right-Hand Rule? According to Faraday's law of electromagnetic induction, when a conductor moves through a magnetic field, an electric current is induced in it. Fleming's right-hand rule is used to determine the direction of the induced current.
Right-Hand Rule For Torque Definition
The right hand rule for torque states that if the fingers of right hand are curled in a direction from the vector r ⃗ \vec r r towards the force applied F ⃗ \vec F F, then thumb points in the direction of torque. Mathematically, it is given as τ ⃗ = r ⃗ × F ⃗ \vec \tau = \vec r \times \vec F τ = r × F
Overview of Right-Hand Rule For Torque
Torque is a measure of the rotational effect produced by a force. This rotational effect is produced when a single force is applied on a body with one end fixed, or by two equal and opposite forces acting along different lines of action.
Demonstrations of torque
The different demonstrations of the right hand rule for torque are shown in the figure:
Right hand rule in terms of angular momentum
n terms of angular momentum, the torque is given as τ ⃗ = Δ L ⃗ Δ t \vec \tau = \frac { {\Delta \vec L}} { {\Delta t}} τ = ΔtΔL , showing that the torque points in the direction of angular momentum. This is rotational version of Newton’s second law F ⃗ = Δ P ⃗ Δ t \vec F = \frac { {\Delta \vec P}} { {\Delta t}} F = ΔtΔP .
Right hand rule in terms of dipole moment and electric field
When an electric dipole having charged ± q \pm q ±q separated by distance 2a is placed in a region of electric field making some angle θ \theta θ with the field, the charges will experience electric forces F ⃗ = ± q E ⃗ \vec F = \pm q\vec E F = ±qE.
What is the right hand rule?
The right hand rule is a hand mnemonic used in physics to identify the direction of axes or parameters that point in three dimensions. Invented in the 19th century by British physicist John Ambrose Fleming for applications in electromagnetism, the right hand rule is most often used to determine the direction of a third parameter when the other two are known (magnetic field, current, magnetic force). There are a few variations of the right hand rule, which are explained in this section.
How to use the right hand rule in physics?
To use the right hand rule in torque problems, take your right hand and point it in the direction of the position vector (r or d), then turn your fingers in the direction of the force and your thumb will point toward the direction of the torque.
How to use the right hand grip rule on a solenoid?
To use the right hand grip rule in a solenoid problem, point your fingers in the direction of the conventional current and wrap your fingers as if they were around the solenoid. Your thumb will point in the direction of the magnetic field lines inside the solenoid. Note that the magnetic field lines are in the opposite direction outside the solenoid. They wrap around from the inside to the outside of the solenoid.
What is the law of induction of a conductor?
When a conductor, such as a copper wire, moves through a magnetic field (B), an electric current (I) is induced in the conductor . This phenomenon is known as Faraday's Law of Induction. If the conductor is moved inside the magnetic field, then there is a relationship between the directions of the conductor's motion (velocity), magnetic field and the induced current. We can use Fleming's right hand rule to investigate Faraday's Law of Induction, which is represented by the equation:
What is the right hand rule for determining the direction of a magnetic field?
Because the force occurs at a right angle to the plane formed by the particle’s velocity and the magnetic field, we can use the right hand rule to determine their orientation .
Which direction do your fingers mirror the magnetic field?
The direction of your fingers will mirror the curled direction of the induced magnetic field. The right hand grip rule is especially useful for solving problems that consider a current-carrying wire or solenoid.
How to teach students to use the right hand rule?
One of the best ways to help students become confident using the right hand rule, is to perform a visual demonstration that helps them recognize and correct their misconceptions about orthogonal relationships and coordinate systems.
