Force and Motion
Which would make it harder to push a heavy box across the floor?
a) Making the floor smoother
b) Putting wheels under the box
c) Adding more weight to the box
d) Pushing faster
c) Adding more weight to the box
Why do power lines use metal wires instead of plastic ones?
a) Metal is cheaper
b) Metal looks better
c) Metal is a good insulator of electricity
d) Metal is a good conductor of electricity
d) Metal is a good conductor of electricity
Which device transforms electrical energy into both light and sound?
a) A fan
b) A television
c) A toaster
d) A heater
b) A television
What form of energy is stored in a stretched rubber band?
a) Kinetic energy
b) Chemical energy
c) Thermal energy
d) Potential energy
d) Potential energy
When riding a bike, how do you increase friction when you need to stop?
a) Pedal faster
b) Turn the handlebars
c) Apply the brakes
d) Shift to a higher gear
c) Apply the brakes
In a simple circuit, why is a switch useful?
a) It makes the battery last longer
b) It controls the flow of electricity by opening or closing the circuit
c) It makes the light brighter
d) It protects from static electricity
b) It controls the flow of electricity by opening or closing the circuit
When you use an electric pencil sharpener, what is the main energy transformation?
a) Electrical → Mechanical
b) Chemical → Light
c) Thermal → Sound
d) Light → Chemical
a) Electrical → Mechanical
Which statement about energy conservation is correct?
a) Energy can be created but not destroyed
b) Energy can be destroyed but not created
c) Energy cannot be created or destroyed
d) Energy can be both created and destroyed
c) Energy cannot be created or destroyed
Which requires more force?
a) Pushing an empty shopping cart
b) Pushing a shopping cart full of groceries
c) They require the same force
d) It depends on the floor type only
b) Pushing a shopping cart full of groceries
What would happen if you replaced a copper wire with a wooden stick in a circuit?
a) The circuit would work better
b) The circuit would work the same
c) The circuit would not work because wood is an insulator
d) The circuit would work because wood is a conductor
c) The circuit would not work because wood is an insulator
What energy transformation occurs in an electric guitar?
a) Mechanical → Electrical → Sound
b) Chemical → Light → Sound
c) Thermal → Mechanical → Light
d) Nuclear → Electrical → Heat
a) Mechanical → Electrical → Sound
When you drop a rubber ball, which energy transformation happens?
a) Kinetic energy to potential energy
b) Potential energy to kinetic energy
b) Potential energy to kinetic energy
What happens to a ball's motion when you hit it harder?
a) Only its speed changes
b) Only its direction changes
c) Both its speed and direction can change
d) Neither speed nor direction changes
c) Both its speed and direction can change
Which would NOT create static electricity?
a) Standing still on a concrete sidewalk
b) Sliding down a plastic slide
c) Rubbing a balloon on your hair
d) Shuffling feet on carpet
a) Standing still on a concrete sidewalk
Which example shows energy doing work?
a) A book sitting on a shelf
b) A parked car
c) A person pushing a shopping cart
d) A pencil lying on a desk
c) A person pushing a shopping cart
What form of energy occurs the most when you are riding a bike?
a) mechanical
b) thermal
c) sound
d) radiant
a) mechanical
A book sits motionless on a table. Which forces are balanced?
a) Gravity pulling down and the table pushing up
b) Friction and gravity
c) Air pressure and weight
d) Magnetism and friction
a) Gravity pulling down and the table pushing up
Why won't a circuit work if there's a gap in the wire?
a) The electricity gets tired
b) Electricity needs a complete path to flow
c) The battery isn't strong enough
d) The wire is too long
b) Electricity needs a complete path to flow
Which device does NOT transform electrical energy?
a) A battery-powered toy
b) A desk lamp
c) An electric drill
d) A burning candle
d) A burning candle
What two forms of energy does the sun provide?
thermal and radiant