What are contact forces?, Contact forces are forces that require physical contact to act, What are non-contact forces?, Non-contact forces can act at a distance without physical contact, How does a rougher surface affect friction?, A rougher surface produces a greater frictional force, How does a smoother surface affect friction?, A smoother surface produces a smaller frictional force, How does increasing an object's mass affect friction?, Greater mass results in greater frictional force between surfaces, Name one harmful effect of friction, Friction causes wear and tear on shoe soles and tyres, What can be added to machine parts to reduce friction?, Lubricants such as oil, grease, or wax reduce friction, How do wheels and rollers help reduce friction?, They enable easier movement by reducing friction between surfaces, Why do fast-moving vehicles have streamlined body shapes?, Streamlined shapes reduce air resistance to move faster, How does the Moon's gravity compare to Earth's gravity?, The Moon's gravity is one-sixth that of Earth's gravity, What is the difference between energy and force?, Energy is the ability to do work, while force is a push or pull, Is force considered matter?, No, force is not matter as it doesn't have mass and it doesn't occupy space, What direction does frictional force act relative to movement?, Friction acts in the direction opposite to an object's motion

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