1. Tall and skinny robots will be able to turn faster.
Advanced: this is due to something physicists call rotational inertia. It tells us that the closer an objects mass is to its centre, the easier it is to rotate.
2. Tall robots will be easier to tip over.
3. The more rubber you have touching the ground, the harder you'll be to push.
Advanced: This is because each bit of rubber touching the ground provides a friction force, more rubber contacting the ground means more friction force.
4. The heavier your robot is, the slower it will be.
Advanced: This is due to something physicists call inertia.