3.2 - Motion - Forces in action

Question 1

What equation links resultant force mass and acceleration

Answer 1

F = ma

Question 2

What is the SI unit and unit for measure of force

Answer 2

kgms^-2 / Newtons

Question 3

What is meant by terminal velocity

Answer 3

When the forces acting on the falling object become balanced so the resultant force is 0. The acceleration becomes 0 and the object is moving at its maximum velocity.

Question 4

What is meant by an object in equilibrium

Answer 4

All forces in any opposing directions are equal meaning that the object is not moving

Question 5

What is the principle of moments

Answer 5

For an object in equilibrium, the sum of the clockwise moments is equal to the sum of the anticlockwise moments.

Question 6

What is a moment

Answer 6

A turning force : force x perpendicular distance

Question 7

What is density

Answer 7

The mass per unit volume of a substance. kgm^-3

Question 8

What is pressure

Answer 8

The normal force exerted on a surface per unit area

Question 9

What is pressure measured in

Answer 9

Pascals / 1 Pa = 1 Nm^-2

Question 10

What is the equation for density

Answer 10

p = m / v
density = mass / volume