What is one of the main challenges when studying forces on Earth?

• Magnetism

• Gravity

• Air resistance

• Friction

What happens to a tennis ball when it is rolled on a table?

• It bounces back

• It gradually slows down and stops

• It maintains a constant speed

• It speeds up

What principle does the hoverball operate on?

• Water buoyancy

• Air resistance

• Magnetic levitation

• Air cushion

Which force is always acting on the hoverball?

• Electrostatic force

• Gravitational force

• Magnetic force

• Nuclear force

What is inertia?

• The energy required to move an object

• The tendency of objects to change their state of motion

• The tendency of objects to resist changes in their state of motion

• The force that causes objects to move

What happens to the hoverball when it hits a barrier?

• It changes direction but keeps moving forward

• It bounces back

• It stops immediately

• It continues in the same direction

What is required to overcome inertia?

• A balanced force

• A constant force

• No force

• An unbalanced force

What indicates that a constant force is being applied to the hoverball using a string?

• The string is limp

• The string is twisted

• The string is taut

• The string is broken

What happens to the hoverball when a constant force is applied?

• It remains stationary

• It decelerates

• It accelerates

• It moves at a constant velocity

What is the key idea for achieving acceleration?

• Balanced constant force

• Unbalanced constant force

• No force

• Variable force