Simple Machines

Which of these is a Class II lever?

When using a broom to sweep the floor, the hand at the top of the handle acts as the:

Which of the following describes a 'Force Multiplier'?

In a Class II lever, the effort arm is always ____ the load arm.

In a second-class lever, if the total length of the bar is $100$ cm and the load is placed $20$ cm from the fulcrum, and effort is applied at the very end, what is the $MA$?

What is the primary purpose of a third-class lever like a pair of tweezers?

A nail cutter is a complex tool. The handle that we press down on to clip the nail functions as which class of lever?

A nail cutter is a complex machine, but its handle specifically acts as which class of lever?

Which component remains at a fixed position while the lever rotates around it?

In a Class 3 lever, if the effort arm is $15\text{ cm}$ and the total length is $45\text{ cm}$, what is the effort required to lift a load of $30\text{ N}$?

If you lift a $20\text{ kg}$ load using a single fixed pulley, how much distance does the load move if you pull $2\text{ meters}$ of rope?

Which of these describes a single fixed pulley?

In a pulley, the wheel rotates around a fixed point. This point is at the:

What kind of machine is a pulley?

If the efficiency of a machine decreases, what happens to the effort required to lift the same load?

When a single fixed pulley is used, where is the fulcrum located?

What is the purpose of the axle in a pulley?

Which of these expresses the correct relationship between Mechanical Advantage ($MA$), Velocity Ratio ($VR$), and Efficiency ($η$)?

Calculate the effort required to lift a load of $120\,N$ using a block and tackle system with a $VR = 3$ and efficiency $80\%$.

How does the weight of the string affect the efficiency of a pulley system?

The slope of an inclined plane is always at an angle between:

An inclined plane is used to lift a weight of $200\text{ N}$ to a height of $1\text{ m}$ using a $4\text{ m}$ long ramp. How much effort is ideally needed?

Which of these is the 'input distance' when using a ramp?

If we want to double the Mechanical Advantage of an inclined plane without changing its height, we should:

Which of the following is true for an inclined plane where the length of the slope is 8m and the height is 2m?

Ancient Egyptians likely used inclined planes to build pyramids. These ramps helped them by:

If you are using a ramp to load a heavy motorcycle into a van, which scenario provides the greatest force multiplier?

Calculate the effort required to push a $150\text{ kg}$ load (where $1\text{ kg} = 10\text{ N}$) up a ramp $10\text{ m}$ long and $2\text{ m}$ high, if the efficiency is $75\%$.

If the slope of an inclined plane is $45^\circ$, and the length is $L$, what is the height $H$ in terms of $L$? (Hint: use $sin(45^\circ) \approx 0.7$)

A screw is turned into a block of wood. If the effort is applied at the head of the screw using a screwdriver, the screw acts as a combination of which two simple machines?

Why is it harder to pull a screw straight out of wood than a nail?

What do we call a screw that has a handle and is used to clamp things on a table?

Which of these is the most common use for a screw in daily life?

A drill bit used to make holes in wood works on the principle of a:

A screw is essentially an inclined plane. In this analogy, the 'length' of the inclined plane is the ________ and the 'height' is the pitch.

Compare two screws, X and Y. Screw X has a pitch of $1\text{ mm}$, and Screw Y has a pitch of $2\text{ mm}$. Which one provides a greater mechanical advantage?

Which simple machine would be most effective for joining two heavy metal plates permanently with the possibility of later disassembly?

A student models a screw by wrapping a right-angled triangular piece of paper around a wooden rod. The triangle has a base of $24\text{ cm}$ and a height of $12\text{ cm}$. The rod has a circumference of $4\text{ cm}$. If the paper is wrapped such that the base of the triangle follows the circumference of the rod, what will be the pitch of the resulting screw thread?

A screw is being driven into a piece of metal. If the friction increases as the screw goes deeper, what happens to the 'Velocity Ratio' (VR) of the system?

Which geometric shape is the 'unrolled' version of one single thread of a screw?

Which of these is a simple machine that changes a downward force into two lateral (sideways) forces?

If a wedge has a length of $L$ and a thickness of $t$, which formula generally represents a higher mechanical advantage?

When a wedge is used, the input force is applied to the:

The edge of a scraper used to remove paint from a wall is a:

Which of the following is a wedge-based tool used for cleaning or removing paint from a flat surface?

Which of these describes the force 'trade-off' when using a long, thin wedge?

When you use a shovel to dig into the ground, which part acts as the wedge?

A technician needs a wedge to split a material with a resistance of $5000\text{ N}$. If the technician can only apply $500\text{ N}$ of effort, what must be the minimum ratio of length to thickness for the wedge?

If the mechanical advantage of a wedge is $10$ and the effort is $50\text{ N}$, but $10\text{ N}$ of that effort is used just to overcome friction, what is the actual load overcome?

Which biological structure acts most similarly to a wedge?

Which of these is a common feature of both a pulley and a wheel and axle?

What is the main reason we use a steering wheel in a car instead of just turning the steering column directly?

A water wheel in an old mill is an example of:

What do we call the distance from the center of the axle to its outer edge?

Why is a screwdriver handle usually made of rubber or plastic with a textured surface?

In a wheel and axle, if the wheel's radius is $R$ and the axle's radius is $r$, and $R > r$, the system:

Which of these changes would make it easier to unscrew a tight bolt using a wrench (treating it as a wheel and axle system)?

If you use a screwdriver with a handle diameter of $3 \text{ cm}$ to drive a screw with a shaft diameter of $6 \text{ mm}$, what is the Mechanical Advantage?

In a wheel and axle, the effort is applied tangent to the wheel. If the radius is $R$ and effort is $E$, what is the torque produced?

A machine is $70\%$ efficient and has a Mechanical Advantage of 7. What is its Velocity Ratio?