# S1 Science Flashcards

What’s difference between contact. And non contact forces?

Contact force touches the thing that they are effective Noncontact forces do not touch the thing that they are affecting

Give three examples of contact force

Surface tension air resistance friction

Give three examples of non-contact forces

Magnetism gravity and static electricity

What causes friction

Friction is a resistive force which opposes the direction of motion of an object this means it acts in the opposite direction to motion

How do you calculate pressure

Pressure equals Force divided by area

What is the unit of measurement for pressure

Newtons per centimetre squared

What is the formula for calculating weight

Weight equals maths times gravitational field strength

What is air resistance

Air resistance is the frictional force air exerts against a moving object. As an object moves, air resistance slows it down. The faster the object’s motion, the greater the air resistance exerted against it.

What does the term streamlining mean

An object that is shaped to travel through air or water with as little resistance as possible

State two examples in sport where athletes streamline to reduce frictional forces

Tight clothing thin bicycle tyres

What is mass

The amount of matter in an object

What is weight

Weight is the force of gravity acting on an object

How would your mass and weight vary on different planets

Each planet has its own gravitational field strength

If a boy was 500 N what is his mass

50 N

If a girl has a mass of 70 kg what is the mass in space where there is no gravitational field strength

70 kg their mass will stay the same