Science Grade 1: Energy, Work, Machines

What is the main source of energy for all living things?

• Sunlight

• Electricity

• Moonlight

• Wind

Name two types of energy that come from the sun.

• Solar geothermal energy

• Solar wind energy

• Solar kinetic energy

• Solar thermal energy, Solar photovoltaic energy

What is a simple machine?

• A simple machine is a type of software used for basic calculations.

• A simple machine is a mechanical device that changes the direction or magnitude of a force.

• A simple machine is a complex device that doesn't change the direction or magnitude of a force.

• A simple machine is a term used to describe a complicated scientific theory.

Give an example of a lever.

• hammer

• bicycle

• wheelbarrow

• seesaw

How does a pulley make work easier?

• A pulley can only be used for light objects and not heavy ones.

• A pulley has no impact on the amount of force needed to lift heavy objects.

• A pulley increases the amount of force needed to lift heavy objects by changing the direction of the force and concentrating the weight on a single rope.

• A pulley reduces the amount of force needed to lift heavy objects by changing the direction of the force and distributing the weight over multiple ropes.

What is the purpose of a wheel and axle?

• To allow for the efficient transfer of rotational motion and torque

• To add unnecessary complexity

• To decrease efficiency in motion transfer

• To make the object heavier

Name a type of work that involves lifting objects.

• telemarketing

• manual labor

• desk job

• computer programming

What is the difference between potential and kinetic energy?

• Potential energy is the energy of sound, while kinetic energy is the energy of light.

• Potential energy is the energy of motion, while kinetic energy is the energy of position.

• Potential energy is energy in motion, while kinetic energy is energy that is stored.

• Potential energy is energy that is stored, while kinetic energy is energy in motion.

How does a screw help in doing work?

• By generating electricity

• By converting rotational motion into linear motion

• By converting linear motion into rotational motion

• By providing light

Explain how a ramp is a simple machine.

• A ramp is a simple machine because it increases the force needed to lift objects vertically by allowing them to be moved up an incline.

• A ramp is a simple machine because it has no mechanical advantage compared to lifting objects vertically.

• A ramp is a simple machine because it is not used for moving objects.

• A ramp is a simple machine because it reduces the force needed to lift objects vertically by allowing them to be moved up an incline.