P10

Question 1

WHAT DOES NEWTONS SECOND LAW OF MOTION STATE?

Answer 1

That if a non zero resultant force acts on an object, it accelerates

Question 2

IF THERE IS NO ACCELERATION…

Answer 2

RESULTANT FORCE IS EQUAL TO 0

Question 3

WHAT EQUATION REPRESENTS NEWTONS SECOND LAW?

Answer 3

Force(N)=mass(kg) x acceleration (m/s2)

Question 4

WHAT DOES THIS EQUATION SHOW?

Answer 4

Acceleration is directly proportional to force ( big force big acceleration ) and inversely proportional to mass ( big mass small acceleration)

Question 5

WHAT IS THE EQUATION FOR WEIGHT?

Answer 5

Weight (N) = mass (kg) x 9.8 (N/kg)

Question 6

WHAT IS TERMINAL VELOCITY?

Answer 6

When velocity reaches a point where it remains constant and no longer accelerates or deaccelerates

Question 7

EXPLAIN IN 3 STEPS WHAT HAPPENS TO S KYDIVER WHEN THEY JUMP OUT A PLANE?

Answer 7

1.When a skydiver jumps out a plane there force of weight immediately acts downwards causing them to fall
2. As they fall air resistance will begin to act upwards, cancelling out the downwards fall so skydiver slightly slow downs
3. as more and more air particles collide with your body air resistance eventually becomes equal to weight, the resultant force is 0 meaning terminal velocity is reached

Question 8

A GREATER BRAKING FORCE IS NEEDED WHEN

Answer 8

vehicle is moving quicker so bigger deacceleration required for it to stop

Question 9

WHAT IS SUM FOR STOPPING DISTANCE?

Answer 9

stopping distance= thinking distance= braking distance

Question 10

WHAT IS THINKING DISTANCE?

Answer 10

the distance travelled during drivers reaction time

Question 11

WHAT IS BRAKING DISTANCE?

Answer 11

the distance travelled under braking force

Question 12

WHAT ASPECTS CAN EFFECT THINKING DISTANCE?

Answer 12

reaction time
-tired
-under influence of drugs and alcohol

Question 13

WHAT ASPECTS EFFECT BRAKING DISTANCE?

Answer 13

-road conditions
- weather
-quality of brakes

Question 14

WHAT IS EQUATION FOR DEACCELERATION?

Answer 14

v2= u2-2as

Question 15

WHAT IS A MOMENTUM?

Answer 15

a property all moving objects have

Question 16

WHAT IS THE EQUATION FOR MOMENTUM?

Answer 16

momentum(kg m/s) = mass (kg) x velocity (m/s)

Question 17

WHAT IS CONSERVATION OF MOMENTUM?

Answer 17

the idea of momentum being conserved is with in a closed system total momentum before collision= total momentum after collision

Question 18

WHEN TWO VEHICLES COLLIDE THEY…

Answer 18

-EXERT EQUAL AND OPPOSITE FORCES
-AND CHANGE OF MOEMNTUM IS EQUAL AS IT IS CONSERVED

Question 19

EQUATION FOR IMPACT FORCE IS?

Answer 19

Force (N) =
mass (kg) x change in velocity (m/s)
/time (s)

Question 20

FROM THE EQUATION WE CAN TELL?

Answer 20

greater mass = greater force
greater change in velocity+ greater force
shorter time= greater force

Question 21

WHY DO CARS HAVE SAFETY FEATURES?

Answer 21

To reduce impact force and therefore force on person is less

Question 22

WHAT DOES AN AIRBAG DO?

Answer 22

Increases impact time on drivers head and neck so force is decreased

Question 23

WHAT DOES A SEATBELT DO?

Answer 23

stretches to prevent person being flung out of car, due to the stretch more time is taken for the body to change momentum so less impact force on body