P10

Question 1

Newton’s second law

Resultant force

Answer 1

Resultant force = mass x acceleration

rF = m x a

N = kg x m/s/s

Question 2

Inertia

Answer 2

The tendency of an object to resist acceleration

And object with lots of inertia will be difficult to start moving or to change its movement

Question 3

Inertial mass

Answer 3

Force / acceleration

Question 4

Terminal velocity equation

Answer 4

W = m x g

Weight = mass x gravity

N = kg x m/s/s or N/kg

Question 5

Terminal velocity

Answer 5

The forces are equal in size but opposite in direction

Question 6

Resultant force

Answer 6

Result of the forces ( the difference)

Question 7

Acceleration - braking force

Answer 7

(V)2 - (U)2 / 2s

Final velocity squared - start velocity squared / 2 x the distance travelled

Question 8

Braking force

Answer 8

mass x acceleration

N = kg x m/s/s

BRAKING FORCE IS THE SAME AS RESULTANT FORCE

Question 9

Momentum

Answer 9

Mass x velocity

kmg/s = kg x m/s

Momentum has a direction

Total momentum before = total momentum after unless there’s an external force applied

Question 10

Elastic

Answer 10

An object is elastic if it returns to its shape when the forces deforming it are removed

Question 11

Extension

Answer 11

The increase of length from the original

Question 12

Limit of proportionality

Answer 12

The extension of a spring is directly proportional to the force applied, as long as its limit of proportionality is not exceeded

Question 13

Hooke’s Law

Answer 13

Force = spring constant x extension

N = N/m x m

F= k x e

Question 14

Impact forces

Answer 14

Soft objects hurt less as the impact takes more time
Increase in time, means a decrease in acceleration
Decrease in acceleration means a decrease in the overall force (as force is affected by acceleration)
Less force, means longer impact, so less pain

Question 15

Force

Answer 15

F = change in momentum / time