Newtons Laws And Terminal Velocity

Question 1

What is the relation between motion and relativity?

Answer 1

All motion can only be be described as moving or stationary in relation to another object

Question 2

What is Newton’s first law?

Answer 2

Inertia
-Tendancy of an object to continue moving if it’s moving
-Tendancy of an object to remain motionless if at rest

Question 3

What is Newton’s second law?

Answer 3

F=ma
Acceleration increases with force
Acceleration decreases with mass

Question 4

What is Newton’s third law?

Answer 4

For every action or force, there is an equal and opposite reaction or force

Question 5

What is inertial mass?

Answer 5

Ratio of force over acceleration
Measure of how difficult it is to change the velocity of an object

Question 6

Explain the force and acceleration experiment?

Answer 6

1)Put air track on a bench with bench pulley at end and two light gates above the track
2)Cut an interrupt card and attach to air track glider
3)Connect glider to hanging mass by string length of the air track over bench pulley
4)Make sure everything is level
5)Set data logging software to calculate acceleration
6)Release glider and record weight and acceleration
7)Repeat removing one weight each time

Question 7

What is terminal velocity?

Answer 7

Any object falling through a fluid reaches a point when it moves at a steady speed in a constant direction because the resultant force is zero

Question 8

How do you work out stopping distance

Answer 8

Stopping distance= thinking distance+braking distance

Question 9

What affects reaction time?

Answer 9

-Tiredness
-Drugs
-Alchohol
-Distraction

Question 10

What factors affect braking distance?

Answer 10

-Poor road and weather conditions, wet icy roads
-poor vehicle conditions, worm brakes or tires

Question 11

Explain what happens when a car brakes

Answer 11

-Force is applied to the brakes
-Work is done by friction between the brakes and wheel
-Reducing kinetic energy of the vehicle
-Slowing it down causing temperature of brakes to increase

Question 12

Why why travelling at high speeds affect braking distance

Answer 12

-Greater braking force produces greater accelerations.
-Large decelerations cause breaks to overheat and driver may loose control

Question 13

What is thinking distance?

Answer 13

Distance a vehicle travels in time it takes for driver to apply breaks after realising they need to stop

Question 14

What is braking distance?

Answer 14

Distance a driver travels after applying the brakes