revision notes

Question 1

What is the force that causes an object to accelerate downwards?

Answer 1

gravity/weight

Question 2

Which force acts slows down an object which is falling through the air?

Answer 2

air resistance

Question 3

What is the relationship between surface area and the amount of air resistance?

Answer 3

velocity/collations with air particles

Question 4

Describe how the velocity of a falling object changes with time’

Answer 4

increases over time

Question 5

What meant by the term ‘terminal velocity’ of a falling object?

Answer 5

Terminal velocity is defined as the highest velocity that can be achieved by an object that is falling through a fluid, such as air or water. When terminal velocity is reached, the downward force of gravity is equal to the sum of the object’s buoyancy and the drag force.

Question 6

What is Newton’s first law?

Answer 6

an object remains in the same state of motion

Question 7

What will happen to a stationary object with no resultant force?

Answer 7

equals zero

Question 8

What will happen to the motion of a moving object with no resultant force?

Answer 8

equals zero

Question 9

What is Newtons second law?

Answer 9

The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

Question 10

What is the equation that links force, mass and acceleration?

Answer 10

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

Question 11

What is the unit of force?

Answer 11

N

Question 12

What is the unit of mass?

Answer 12

Kg

Question 13

What is the unit of acceleration?

Answer 13

m/s2

Question 14

What is inertia?

Answer 14

a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force

Question 15

What is Newton’s Third law?

Answer 15

Newton’s third law of motion, whenever two objects interact, they exert equal and opposite forces on each other.

Question 16

Do Newtons third law pairs of force act on the same body or different bodies?

Answer 16

So it’s a given that this is true. “The two forces in each pair can act on the same body or on different bodies”.

Question 17

Are Newton’s third law pair forces the same size or different sizes?

Answer 17

Newtons’s Third Law says that they have to be the same, even if they’re different sizes.

Question 18

Do Newton’s third law pair forces act in the same direction or in different directions?

Answer 18

the forces act on two different objects at the same time.