Momentum and Moment

Question 1

The formula for momentum and the units?

Answer 1

P = m x v

Units: kg.m/s

Question 2

Relationship between the rate of change in momentum and force?

Answer 2

Proportional

F = (mv - mu)/ t

Question 3

The total momentum of objects that collide…

Answer 3

remains the same

Momentum before collision = Momentum after collision

Question 4

The term “impulse” means?

Answer 4

Force x time

Question 5

Escape lanes filled with soft sand…

Answer 5

Soft sand slows down heavy lorries

Question 6

Action and reaction forces act on…

Answer 6

Different objects in the opposite direction

Question 7

The formula for moment?

Units?

Answer 7

Moment = F x perpendicular distance from the pivot

Units: N.m

Question 8

When are pivoted objects in balance?

Answer 8

When the sum of anticlockwise moment = sum of clockwise moment

Question 9

Centre of gravity is also known as…

Answer 9

Centre of mass

Question 10

Centre of gravity for stable and unstable objects?

Answer 10

Stable: low centre of gravity and broad base

Unstable: high centre of gravity and narrow base

Question 11

How is stability achieved with low gravity centre and broad base?

Answer 11

When knocked these result in a turning effect that pulls it back to its original position