(1.13-1.18) Vector vs Scalar, force + weight

What are vector quantities?

Quantities that have both magnitude and direction.

What are scalar quantites?

Quantities that have only magnitude

What kind of quantity is force?

A vector quantity.

Give three examples of vector quantities.

Force

Weight

Velocity

Acceleration

Momentum

Give three examples of scalar quanitites.

Temperature

Mass

Energy

Speed

Density

Describe how to calculate resultant forces that act along a line.

Add the forces in the same direction. Subtract forces facing opposite directions. This will give the ‘net force.’

What is friction?

A force that opposes motion.

State the equation linking force, mass and acceleration

Force = mass * acceleration

F = m * a

N = kg * m/s²

What is gravitational field strength on Earth?

9.8 N/kg

State the relationship between mass, weight and gravitational field strength.

Weight = mass * grav. field strength

W = m * g

N = kg * m/s²