Science - Matter and Machines

Example of a Lever

• A seesaw.

• A wheelbarrow.

• A pulley.

• A hammer.

What is a simple machine? Write three examples.

• A device that makes work easier, such as a Lever, Inclined Plane, and Pulley.

• A complex device that requires multiple parts to function.

• A tool used only in construction work.

• A type of machine that cannot be moved.

Write the formula for mechanical advantage and calculate MA for a lever lifting a 120 N load with 30 N effort.

• Mechanical Advantage (MA) = Load / Effort. MA = 3.

• Mechanical Advantage (MA) = Load / Effort. MA = 4.

• Mechanical Advantage (MA) = Load / Effort. MA = 5.

• Mechanical Advantage (MA) = Load / Effort. MA = 6.

Why is a ramp an example of an inclined plane?

• A ramp is a flat surface tilted to help move heavy objects up or down.

• A ramp is a vertical surface that helps lift objects straight up.

• A ramp is a curved surface that allows objects to roll down easily.

• A ramp is a type of lever that requires less force to lift an object.

What is Mechanical Advantage?

• A measure of the force amplification achieved by using a tool, mechanical device, or machine system.

• The ratio of the output force to the input force in a machine.

• The ability of a machine to perform work without any energy loss.

• A method to increase the speed of a machine.

An inclined plane helps lift heavy objects easily.

• True

• False

• Sometimes

• Only for small objects

Examples of Machines

• A knife, a bicycle, a wheelbarrow.

• A spoon, a skateboard, a car.

• A hammer, a skateboard, a computer.

• A fork, a scooter, a television.

What is a Lever?

• A type of simple machine that uses a fulcrum to lift or move objects.

• A tool used for cutting materials.

• A device that converts electrical energy into mechanical energy.

• A mechanism that stores energy for later use.

Potential energy is stored energy.

• True

• False

• Partially true

• Not applicable

How do pulleys make lifting easier?

• Pulleys use a wheel and rope to reduce the effort needed to lift objects.

• Pulleys increase the weight of the object being lifted.

• Pulleys are used to lift objects without any effort.

• Pulleys only work with heavy objects.