Mechanics

Question 1

How do you find the max height of an object

Answer 1

V = 0 ms-1 , so use suvat

Question 2

Define newtons 2nd law

Answer 2

An objects acceleration is proportional to the resultant force experienced

Question 3

Define newtons 3rd law

Answer 3

For each force experienced by an object, the object will exert an equal and opposite force

Question 5

Define impulse

Answer 5

The rate of change of momentum

Question 6

How does newtons 2nd law relate to momentum

Answer 6

Force is rate of change of momentum

Question 7

What does the area under a force time graph represent

Answer 7

Change in momentum

Question 8

How do car safety features work

Answer 8

Impacts time increases so force exerted on passengers decreases

Question 9

What is the equation for work done

Answer 9

W = F s cos x

Question 10

Why does an object slow down if you throw it upwards

Answer 10

KE is converted into GPE

Question 11

Why does initial KE not equal max GPE

Answer 11

Work is done by the object against resistive forces, so KE is transferred to the environmental in the form of heat due to air resistance

Question 12

Define a couple

Answer 12

A pair of coplanar forces where the two forces are equal in magnitude but act in opposite directions

Question 13

Define the principle of moments

Answer 13

For an object to be in equilibrium, the sum of anti-clockwise moments about a pivot it equal to the sum of clockwise moments