Forces In Action

Question 1

Terminal velocity

Answer 1

· Forces acting on a falling object become balanced; resultant F = 0
· Acceleration = 0 and
· Object moving after max velocity

Question 2

Principle of moments

Answer 2

Object in equilibrium; sum of clockwise moments = sum of anticlockwise moments

Question 3

Defined Moment

Answer 3

Product of force and perpendicular distance from a pivot or stated point

Question 4

Defined Couple

Answer 4

Pair of equal and opp. forces acting on a body but not in the sadness straight line

Question 5

Defined Couple

Answer 5

Pair of equal and opp. forces acting on a body in parallel to each other
- Produce a rational force
- No translational movement

Question 6

Defined density

Answer 6

Mass per unit volume of a substance

Question 7

Defined pressure

Answer 7

Force exerted per until cross sectional area (Pa)

Question 8

Archimedes’ Principle

Answer 8

Upthrust of an object in a fluid = to weight of fluids it displaces
- Upthrust < weight => object sinks
- Upthrust = weight => object floats

Question 9

When F = ma is used

Answer 9

When a is constant

Question 10

Moment of a force

Answer 10

Magnitude of the force * perpendicular distance
- Turning effect

Question 11

Distance for movent of force

Answer 11

Between perpendicular distance and line o action of force

Question 12

Torque of a couple

Answer 12

Product of the magnitude of ONE of the forces
- Total moment of the couple