Exploring Turning Forces

What is a lever and how does it work?

• A lever is a device that generates electricity using magnets.

• A lever is a simple machine that amplifies force by using a rigid bar and a fulcrum.

• A lever is a tool used for measuring weight.

• A lever is a type of pulley that moves objects vertically.

Define the term 'moment' in the context of turning forces.

• A moment is the total force applied to an object.

• A moment refers to the speed of an object in motion.

• A moment is the angle at which a force is applied.

• A moment is the product of force and the distance from the pivot point, causing rotation.

How is torque measured in newton metres?

• Torque is measured in kilograms (kg) as the mass times acceleration.

• Torque is measured in newtons (N) as the force applied at a distance.

• Torque is measured in newton metres (Nm) as the product of force in newtons and distance in metres.

• Torque is measured in joules (J) as the product of force and energy.

What role does a pivot play in a lever system?

• The pivot acts as a handle for the user to push the lever.

• The pivot acts as the fulcrum that enables the lever to function by providing a point of rotation.

• The pivot serves as a weight that balances the lever.

• The pivot is a fixed point that prevents any movement of the lever.

Explain how a turn is created using a lever.

• A turn is created by pulling the lever straight up without any force applied.

• A turn is created by rotating the lever in a circular motion without a pivot point.

• A turn is created by pushing the lever downwards without a fulcrum.

• A turn is created by applying force to one end of a lever, causing it to pivot around a fulcrum.

What is the formula for calculating the moment of a force?

• Moment = Force × Distance

• Moment = Force + Distance

• Moment = Force / Distance

• Moment = Distance - Force

Give an example of a first-class lever and explain its components.

• A door hinge is an example of a first-class lever.

• A pair of scissors is an example of a first-class lever.

• A seesaw is an example of a first-class lever.

• A wheelbarrow is an example of a first-class lever.

How does the distance from the pivot affect the moment?

• The moment is only affected by the weight applied, not the distance from the pivot.

• The moment decreases with greater distance from the pivot.

• The moment increases with greater distance from the pivot.

• The moment remains constant regardless of the distance from the pivot.

What is the significance of the fulcrum in a lever?

• The fulcrum is significant because it allows a lever to amplify force, making it easier to lift heavy loads.

• The fulcrum is the point where the lever is attached to the ground.

• The fulcrum is used to balance the lever without any force amplification.

• The fulcrum is significant because it prevents the lever from moving.

Describe how levers can be used to lift heavy objects.

• Levers can only lift objects that are lighter than the force applied.

• Levers can lift heavy objects by using a fulcrum to create mechanical advantage, allowing a smaller force to lift a larger load.

• Levers work by pushing objects directly without a fulcrum.

• Levers are ineffective for lifting any weight over 10 pounds.