A ball is placed on a flat surface. If no external force is applied, what will happen to the ball?

• It will start rolling on its own.

• It will remain stationary.

• It will bounce up and down.

• It will move in a circular path.

Tags

NGSS.3-PS2-1

When a toy car is pushed on a smooth floor, it eventually stops. What is the main reason for this?

• The car runs out of energy.

• The floor is too smooth.

• Friction between the car and the floor.

• The car is too heavy.

Tags

NGSS.3-PS2-1

What happens to the energy when two marbles collide?

• All energy is lost.

• Energy is transferred between the marbles.

• Energy is created.

• Energy disappears.

Tags

NGSS.4-PS3-3

Which of the following devices converts solar energy into electrical energy?

• Wind turbine

• Solar panel

• Hydroelectric dam

• Geothermal plant

Tags

NGSS.4-PS3-4

A child is playing with a toy car on a ramp. What will happen if the ramp is made steeper?

• The car will move slower.

• The car will move faster.

• The car will stop moving.

• The car will move in the opposite direction.

Tags

NGSS.3-PS2-1

If two skaters push off each other, what will happen to their motion?

• Both skaters will move in the same direction.

• Both skaters will move in opposite directions.

• Only one skater will move.

• Neither skater will move.

Tags

NGSS.3-PS2-1

A scientist is designing a device that converts wind energy into electrical energy. What is the most important factor to consider in the design?

• The color of the device

• The speed of the wind

• The weight of the device

• The height of the device

Tags

NGSS.4-PS3-4

During a collision between two cars, what happens to the energy involved?

• It is completely lost.

• It is transferred to the surroundings.

• It is stored in the cars.

• It is converted into sound and heat.

Tags

NGSS.4-PS3-3

A student is asked to design a simple machine that uses a lever to lift a weight. What should the student consider to make the machine more efficient?

• The length of the lever arm

• The color of the lever

• The weight of the lever

• The material of the weight

Tags

NGSS.4-PS3-4

A group of students is conducting an experiment to observe the effects of balanced and unbalanced forces on a moving object. What should they do to ensure accurate results?

• Use different objects for each trial.

• Change the surface for each trial.

• Keep the force applied constant for each trial.

• Use different measuring tools for each trial.

Tags

NGSS.3-PS2-1