chapter 8 A level

Question 1

what happens at terminal velocity

Answer 1

F from F = mg = drag force from Fr

Question 2

how can you work out acceleration from 200N and 1200kg

Answer 2

a = f/m
0.17 = 200/1200
a = 0.17ms^-2

Question 3

The frictional force on a vehicle traveling on a certain type of level road surfaces 0.6 times the vehicles weight for a vehicle of a mass of 1200 kilograms

b)
Calculate the breaking distance on the this road for a speed of 30ms^-1

Answer 3

s = u^2/2a
76.3 = 30^2/2(5.9)

Question 4

Explain why cyclist can reach a higher top speed by crouching over a handlebars instead of sitting upright while pattern

Answer 4

Cyclists can achieve higher top speeds by crouching over the handlebars instead of sitting upright due to reduced air resistance in the streamlined position, better power transfer, a lower center of gravity for improved stability, and reduced wind buffeting. This more aerodynamic and bio mechanically efficient posture allows cyclists to go faster with the same effort.

Question 5

explain why a vechicle has a higher top speed on a downhill stretch of road than on level road

Answer 5

A vehicle attains a higher top speed on a downhill road due to the assistance of gravity, which provides extra forward force, reduced rolling resistance, the conversion of potential energy into kinetic energy, decreased air resistance, and the inherent inertia of objects in motion. These factors collectively enable the vehicle to accelerate and maintain higher speeds on a downhill slope than on level ground.

Question 6

lift stationary or at constant speed (na a)

Answer 6

T = mg

Question 7

lift acceleration upwards

Answer 7

T - mg = ma

Question 8

lift acceleration downwards

Answer 8

= mg - T