6 Further Mechanics

Question 1

What is impulse

Answer 1

Change in momentum

Question 2

Equation linking impulse, force and time

Answer 2

P= F x t

Question 3

What is equal to the area under the force against time graph

Answer 3

Impulse

Question 4

How can the force felt in a car crash be reduced

Answer 4

Increase the time of the impact by
•wearing seatbelts
•having air bags
•crumple zone

Question 5

In what collisions is momentum conserved?

Answer 5

All collisions

Question 6

In what collisions is kinetic energy conserved?

Answer 6

Elastic collisions

Question 7

Equation linking work done, force and distance (learn)

Answer 7

W= F x X

Question 8

Equation linking kinetic energy and momentum

Answer 8

KE= p^2/2m

Question 9

In what energy form is energy conserved in an elastic collision?

Answer 9

All energy is conserved as kinetic energy

Question 10

In what energy form is energy conserved in an inelastic collision?

Answer 10

Kinetic energy but also transferred to thermal and sound

Question 11

angular displacement (theta) (learn)

Answer 11

Arc length/ radius

Measured in radians

Question 12

Angular speed (w) (learn)

Answer 12

Angular displacement/ time

Measured in radians per second

Question 13

Linear speed (v)

Answer 13

Angular speed x radius

Measured in metres per second

Question 14

Period (T)

Answer 14

2pi/ angular speed

Question 15

Frequency (f) (learn)

Answer 15

1/T and w/2pi

Question 16

Which way does centripetal acceleration act?

Answer 16

Perpendicular to tangential velocity, inwards towards the centre of the circle

Question 17

Equations of centripetal acceleration

Answer 17

a= v^2/r

a=w^2 x r

Question 18

Equations for centripetal force

Answer 18

F=mv^2/r

F=m x w^2 x r