A ball rolls on two surfaces: one is smooth and one is rough. Does the smooth or the rough surface create more friction? On which surface does the ball roll for a longer time?

What object can pull objects toward it without touching?

When we use the same force to hit a tennis ball and a basketball, which one will be less affected by the force?

Which make an object move? Balanced or unbalanced forces?

What's gravity? Can you give an example?

What are unbalanced forces? Can you give an example of unbalanced forces on an object?

What's the difference between a force that pushes and a force that pulls?

When we use the same force to pull a car and a wagon, which one will move a longer distance?

When we apply a stronger force to an object, will it go a longer or shorter distance?

In which direction does gravity pull everything with mass?

Can you give an example of something that overcomes gravity?