A leaf falls slower than a stone. What force still pulls both downward?

The Moon stays in its path around the Earth because of ____.

A child jumps and comes back down to the ground. Which force causes this?

What would happen if there were no gravity on Earth?

A box is hard to push on a rough floor. Which force is acting?

Shoes with rubber soles help prevent slipping. What do they increase?

Putting oil on a squeaky door helps it move easily. What does oil do?

Car brakes stop the car by using ____.

Sand is spread on wet roads so cars will not slide. What does sand do?

A glowing bulb uses what form of energy?

A moving fan has ____.

Food gives your body energy. What kind is this?

The heat from the sun is an example of ____.

A ringing bell produces ____.

A ramp used to push heavy boxes is a ____.

A see-saw is an example of a ____.

A door knob is an example of a ____.

A flag raised using a rope and wheel uses a ____.

A knife is an example of a ____.

Why do astronauts appear to float in space?

Which situation best shows gravity?

What happens when gravity increases?

Which surface has the greatest friction?

Why do bicycle brakes have rubber pads?

Which action reduces friction?

A child slides faster on a smooth slide than on a rough one because ____.

Which situation shows increased friction?

Which energy is stored in food?

Which shows energy transformation?

Which is an example of mechanical energy?

A solar panel changes sunlight into ____.

Which is NOT a form of energy?

Jared and his father were preparing firewood for cooking. They found a thick piece of wood that was hard to break. Jared placed the sharp metal edge of an axe on the wood and struck it several times until the wood split into two smaller pieces. Which simple machine is the sharp edge of the axe?

Anna’s family gets water from a deep well. To make lifting the heavy bucket easier, a wheel was placed at the top of the well. A rope passes over the wheel, and Anna pulls the rope down so the bucket goes up. What simple machine is used in this situation?

Ben tried to open a tightly closed jar of peanut butter. He twisted the lid again and again until it finally opened. The lid has spiral grooves inside that move upward when turned. What simple machine is the jar lid?

During flag ceremony practice, the class noticed that the flag was raised by pulling a rope downward while the flag moved upward. The rope runs through a wheel attached to the top of the flagpole. Which simple machine is being used to raise the flag?

Workers were loading heavy boxes into a delivery truck. Instead of lifting the boxes straight up, they placed a long wooden plank from the ground to the truck. They pushed the boxes up the plank to make the job easier. What simple machine does the plank represent?

Carla tried to open a classroom door. She held the round knob and turned it. The knob is attached to a rod inside the door that moves when the knob is turned. Which simple machine is the door knob?

Leo saw a large rock blocking the pathway. He used a long metal bar and placed one end under the rock while pushing down on the other end. The rock slowly lifted. What simple machine is Leo using?

To move a heavy cabinet across the classroom, the janitor placed it on a small cart with wheels. He pushed the cabinet easily instead of dragging it on the floor. Which simple machine is being used?

Mia was fixing a loose board. She placed a nail on the wood and hammered it until the sharp tip went inside and held the board in place. What simple machine is the nail?

A farmer repaired a broken fence by tightening a metal bolt. He turned it using a wrench until the wood pieces were firmly joined. What simple machine is the bolt?

Why is it easier to pull luggage with wheels?

Why should machines be cleaned and oiled regularly?

Why do workers wear gloves when lifting tools?

Why should children not play near machines?

Which shows proper machine handling?

Why should machines be stored properly?

Why are simple machines important?

What energy transformation happens when an electric iron is used?

Which statement correctly describes the energy used by a flashlight?

What energy transformation occurs when a television is turned on?

What type of energy is mainly used when a person rides a bicycle?

Which energy change happens when cooking using a gas stove?

How does a radio use energy?

What energy transformation happens in a solar-powered calculator?