Which of one these needs a pull force?

When you push a box forwards, which way is FRICTION pushing the box?

Which picture shows more friction?

Does friction make things move faster or slower?

If a tennis ball was rolled down a ramp onto each of these surfaces, which would let the ball travel the furthest?

Which force makes it possible for you to fall down?

If you held two bar magnets with one’s North pole facing the other’s South pole, what would happen?

If you held two bar magnets with their North poles facing each other, what would happen?

Which of these objects is magnetic?

Which metal is attracted to a magnet?