9-Momentum

Question 1

What does the conservation of momentum law state?

Answer 1

That, in any interaction, momentum is conserved.

Question 2

What does the total momentum before equal?

Answer 2

The total momentum after

Question 3

What does the total y momentum before equal?

Answer 3

The total y momentum after

Question 4

What does the total x momentum before equal?

Answer 4

The total x momentum after

Question 5

Why does a cannon recoil?

Answer 5

Because there is no momentum before firing, but the cannon ball has momentum, which means that the cannon recoils with equal and opposite momentum

Question 6

What is the unit of momentum?

Answer 6

p

Question 7

What is momentum measured in?

Answer 7

kgms-1

Question 8

What is the equation of momentum?

Answer 8

Mass x Velocity

Question 9

Is momentum a vector or a scalar value?

Answer 9

It is a vector

Question 10

What is the mass of an object?

Answer 10

The amount of matter in an object

Question 11

What is the weight of a mass?

Answer 11

The pull of gravity acting on the mass

Question 12

What is Newton’s first law?

Answer 12

Inertia

Question 13

What does inertia state?

Answer 13

That the momentum of a body will not change unless a force acts on it

Question 14

What does Newton’s second law state?

Answer 14

A stronger force will make the momentum change quicker than a weaker force

Question 15

What equation can you derive from Newton’s second law?

Answer 15

Force = Change in momentum / Time

Question 16

How do you derive ‘F=ma’?

Answer 16

F = Change in momentum / time = mv/t = m x v/t = ma

Question 17

What does force x time equal?

Answer 17

The change in momentum

Question 18

What does Ft get called?

Answer 18

The impulse

Question 19

What are crumple zones in cars designed to do?

Answer 19

Increase the time taken in a collision

Question 20

What is the definition of an impulse?

Answer 20

A force acting briefly on an object causing a change in momentum.

Question 21

What is the equation of acceleration?

Answer 21

Change in velocity / Change in time

Question 22

What is the area under a force time graph?

Answer 22

The total impulse

Question 23

What is Newton’s third law?

Answer 23

Momentum is always conserved, so the momentum lost by B is gained by A

Question 24

If A pulls B in one direction, what does B do?

Answer 24

Pulls A with an identical force in the opposite direction

Question 25

What does g equal>

Answer 25

9.8ms-2

Question 26

What is the equation of weight?

Answer 26

Mass x g

Question 27

What is the weight mg caused by?

Answer 27

The gravitational pull of the earth

Question 28

If the book is stationary on a table, what does the downwards pull of the earth on the book equal?

Answer 28

The upwards push from the shelf

Question 29

What happens when you multiply the force by the displacement?

Answer 29

You get the work done by the object

Question 30

What is work done measured in?

Answer 30

Joules

Question 31

What does work done equal?

Answer 31

Force x distance

Question 32

What is energy?

Answer 32

The capacity to do work

Question 33

If a car decelerates to a halt, what do the brakes do?

Answer 33

They exert a force on the car and do work on the brake linings, heating them.

Question 34

What is the energy of any moving object called?

Answer 34

The kinetic energy

Question 35

Why is the kinetic energy less in reality?

Answer 35

There are numerous other forces present, all doing work

Question 36

What is the equation of kinetic energy?

Answer 36

1/2 mv^2

Question 37

In the absense of any other forces than gravity, what does F=ma equal?

Answer 37

F=mg

Question 38

What is the symbol equation of work done (Force x displacement)?

Answer 38

mgh

Question 39

What is the equation of gravitational potential energy?

Answer 39

Mass x g x height

Question 40

What is gravitational potential energy?

Answer 40

The work done in lifting that can be transferred from this store if it is allowed to fall

Question 41

What does the kinetic energy gained equal?

Answer 41

The change in gravitational potential energy

Question 42

What does the final kinetic energy equal?

Answer 42

The initial kinetic energy + change in gravitational potential energy

Question 43

What is an object projected outwards called?

Answer 43

A projectile

Question 44

As the weight (mg) of a body can be resolved into perpendicular components at an angle theta, what equation can you derive?

Answer 44

mg cos(theta)

Question 45

As weight is a vertical force, what can't it change?

Answer 45

The horizontal velocity component of a moving object

Question 46

What affects the weight component of a projectile?

Answer 46

Air resistance

Question 47

What is the vertical component accelerated downwards by?

Answer 47

Gravity

Question 48

What happens to the horizontal component of a projectile in motion?

Answer 48

It remains constant, as it is not affected by air resistance