KS3 3.6 Turning Forces 概念

What is a lever?

• A lever is a type of pulley.

• A lever is a simple machine consisting of a rigid bar that rotates around a fixed point called a fulcrum.

• A lever is a type of screwdriver.

• A lever is a type of wheel.

What is the formula for moment?

• force subtracted by distance

• force added to distance

• force multiplied by distance

• force divided by distance

What is equilibrium?

• A state of balance or stability in a system where opposing forces or influences are equal.

• A state of imbalance or instability in a system where opposing forces or influences are equal.

• A state of complete chaos and disorder in a system where opposing forces or influences are equal.

• A state of temporary balance or stability in a system where opposing forces or influences are equal.

What is the center of mass?

• The center of mass is the point in an object or system of objects where the mass is evenly distributed and behaves as if all the mass is concentrated at that point.

• The center of mass is the point in an object where the mass is concentrated at the edges.

• The center of mass is the point in an object where the mass is evenly distributed but does not affect the object's behavior.

• The center of mass is the point in an object where the mass is concentrated at one end.

What is rotational motion?

• The movement of an object in a straight line

• The expansion of an object in size

• The transformation of an object into a different shape

• The movement of an object around an axis or center point.

What are the three classes of levers?

• lever class 1, lever class 2, and lever class 3

• primary lever, secondary lever, and tertiary lever

• first class lever, second class lever, and third class lever

• type 1 lever, type 2 lever, and type 3 lever

How is moment calculated?

• By subtracting the force applied to an object from the perpendicular distance from the point of rotation to the line of action of the force.

• By multiplying the force applied to an object by the perpendicular distance from the point of rotation to the line of action of the force.

• By dividing the force applied to an object by the perpendicular distance from the point of rotation to the line of action of the force.

• By adding the force applied to an object to the perpendicular distance from the point of rotation to the line of action of the force.

What are the conditions for equilibrium?

• The net force acting on an object must be non-zero and the net torque acting on an object must be zero.

• The net force acting on an object must be zero and the net torque acting on an object must be non-zero.

• The net force acting on an object must be non-zero and the net torque acting on an object must be non-zero.

• The net force acting on an object must be zero and the net torque acting on an object must be zero.

How is the center of mass determined?

• By finding the average position of all the mass in a system.

• By determining the position of the heaviest object in the system.

• By measuring the total mass of the system.

• By calculating the sum of all the masses in the system.

What are the factors affecting rotational motion?

• energy, power, and work

• force, velocity, and acceleration

• torque, moment of inertia, and angular acceleration

• mass, velocity, and displacement