P10

Question 1

What does the greater the resultant force on an object result in?

Answer 1

A greater acceleration of an object

Question 2

What does the greater the mass of an object result in?

Answer 2

A smaller acceleration for a given force

Question 3

What is the equation for resultant force(F)

Answer 3

mass(m) X acceleration(a)

Question 4

what is the intertia of an object?

Answer 4

Its tendency to stay at rest or in uniform motion

Question 5

What is the equation for weight(W)

Answer 5

mass(m) X gravitational field strength(g)

Question 6

What is the weight of an object?

Answer 6

The force acting on the object due to gravity

Question 7

What does the object acting on only by gravity do?

Answer 7

accelerated at 10m/s2

Question 8

What is the terminal velocity of an object?

Answer 8

The velocity it eventually reaches when it is falling

Question 9

What is the resultant force of an object when moving at terminal velocity?

Answer 9

0

Question 10

What do friction and air resistance do to the force of a vehicle?

Answer 10

Oppose/push against it

Question 11

What does the stopping distance of a vehicle depend on?

Answer 11

The thinking distance and braking distance

Question 12

what gives the braking force of a vehicle?

Answer 12

Force= mass X acceleration

Question 13

What is momentum of a moving object?

Answer 13

Momentum of a moving object(p)= mass(m) X velocity(v)

Question 14

What is the unit for momentum?

Answer 14

kg m/s( kilograms metres per second)

Question 15

what is conservation of momentum?

Answer 15

Yeh total momentum before an event is the same as the total momentum after the event.

Question 16

What can a closed system also be called?

Answer 16

Conservation of momentum

Question 17

What does momentum have?

Answer 17

Size and direction?

Question 18

What is momentum defined as?

Answer 18

mass X velocity

Question 19

What is 2 objects total momentum if they move with different speeds and unequal masses?

Answer 19

0

Question 20

What does the force of the impact depend on when 2 cars collide?

Answer 20

Mass, change of velocity and length of impact.

Question 21

What happens when the impact time of a crash increases?

Answer 21

the impact force is reduced

Question 22

Name 2 things that happen when 2 vehicles collide

Answer 22

The exert equal and opposite forces on eachother
their total momentum is unchanged

Question 23

what is the impact force equation?

Answer 23

Change of momentum divided by impact time

Question 24

How do cycle helmets and cushioned surfaces reduced impact forces?

Answer 24

by increasing impact time

Question 25

How do seat belts and air bags become a safety feature?

Answer 25

by increasing impact time

Question 26

How do side impact bars and crumple zones become a safety feature?

Answer 26

they give way in an impact and therefor increase the impact time

Question 27

what can be used to find the speed of a car before an impact?

Answer 27

conservation of momentum

Question 28

What is an object called if it returns to its original shape after removing the force deforming it?

Answer 28

Elastic

Question 29

What is extension?

Answer 29

The difference between the length of the object and its original length

Question 30

What is the extension of a spring and the force applied to it

Answer 30

directly proportional

Question 31

What happens beyond the limit of proportionality?

Answer 31

the extension of a spring is no longer proportional to the applied force

Question 32

What is the inertia of an object?

Answer 32

Its tendency to stay at rest or in uniform motion