Newton's Laws

Question 1

define Inertia

Answer 1

Inertia is the tendency to resist any change in motion

Question 2

give an example of Inertia

Answer 2

when you are on a fast train and it breaks suddenly, your body will lurch forwards. This is because the breaks are acting on the train and not your whole body. Your feet will slow down but your body will not.

Question 3

define newton’s first law

Answer 3

A body will remain at rest or continue to move at a constant velocity unless acted upon by an external (resultant) force.

Question 4

define newton’s second law

Answer 4

The acceleration of an object is proportional to the resultant force

and inversely proportional to the mass of the object

(greater the mass of an object, the more force it will take to accelerate the object.)

Question 5

relationship between acceleration and resultant force

Answer 5

acceleration of an object is directly proportional to the resultant force acting on that body.

Question 6

relationship between acceleration and mass

Answer 6

acceleration of an object is inversely proportional to the mass of that body.

Question 7

what is the difference between mass and weight?

Answer 7

Mass (kg) is a measure of how much matter there is in an object, while weight is a measure of the size of the pull of gravity on the object

Question 8

terminal velocity is when….

Answer 8

the object moves at a steady speed in a constant direction because the resultant force acting on it is zero.

Question 9

why does why a falling object reach a terminal speed?

Answer 9

The force of gravity acts on an object, causing it to accelerate towards the earth. As its velocity increases the drag force (friction) exerted on it by the air increases. When the two forces on the object balances, it reaches a constant velocity.

Question 10

Newtons 3rd law

Answer 10

In an interaction between A and B, the force exerted by A on B is equal and opposite to the force exerted by B on A.

Question 11

what is a force

Answer 11

a push or pull acting on an object due to interaction with another object

Question 12

define resultant force

Answer 12

the sum of all individual forces acting on an object

Question 13

how do you calculate resultant force?

Answer 13

add together the vector arrows of all individual forces

Question 14

define inertia

Answer 14

Inertia is a resistance to a change in motion