Topic 10 - Newton's Laws

Question 1

What is mass?

Answer 1

The amount of matter an object contains, constant.

Question 2

What is inertia?

Answer 2

A measure of how difficult it is to change the object’s motion.

Question 3

What is the relationship between inertia and mass?

Answer 3

An object with a high mass has more inertia than an object with a lower mass.

Question 4

What is weight?

Answer 4

The force that acts on the object when it is in a gravitational field.

Question 5

What is weight measured in?

Answer 5

Newtons (N)

Question 6

What is the equation for weight?

Answer 6

Mass x Gravitational field strength

Question 7

What is mass measured in?

Answer 7

Kilograms (kg)

Question 8

What is gravitational field strength measured in?

Answer 8

Newtons per kilogram (N/kg)

Question 9

What is Newton’s first law?

Answer 9

An object will remain in the same state of motion unless acted upon by a resultant force.

Question 10

What happens if an object is stationary and no resultant force is acting on it?

Answer 10

It remains stationary

Question 11

What happens if an object is moving and no resultant force is acting on it?

Answer 11

It remains moving at the same speed

Question 12

What is a resultant force?

Answer 12

The sum of all of the forces acting on an object.

Question 13

What is Newton’s second law?

Answer 13

A force may cause a mass to accelerate (change speed or direction or both).

Question 14

What is the equation for Resultant force?

Answer 14

Mass x Acceleration

Question 15

What is Newton’s third law?

Answer 15

For every action, there is an equal and opposite reaction.

Question 16

What is the only acting force in free fall?

Answer 16

Object’s weight, acting downwards due to gravity

Question 17

What is acceleration due to gravity?

Answer 17

The constant rate at which an object accelerates in free fall.

Question 18

What is the acceleration on Earth?

Answer 18

9.81 m/s2 (10)

Question 19

What is air resistance?

Answer 19

A frictional force that opposes the motion of objects moving quickly through air.

Question 20

What does air resistance do to a falling object?

Answer 20

Slows it down, the force due to air resistance increases as the speed of a falling object increases.

Question 21

What is terminal velocity?

Answer 21

The fastest that an object can fall.

Question 22

Terminal Velocity 1

Answer 22

At the start of the motion, the speed increases as the object is accelerating due to gravity.

Question 23

Terminal Velocity 2

Answer 23

This increase in speed causes an increase in air resistance.

Question 24

Terminal Velocity 3

Answer 24

The acceleration then starts to decrease as air resistance opposes the motion.

Question 25

Terminal Velocity 4

Answer 25

The air resistance increases until it equals the weight of the object.

Question 26

Terminal Velocity 5

Answer 26

Once the weight and force due to air resistance are equal, the object stops accelerating and has reached terminal velocity.