Motion

Question 1

Units for:
Distance
Displacement
Speed
Velocity
Time
Acceleration
Mass
Force

Answer 1

• Distance - metres (m)
• Displacement - metres plus a direction (m north)
• Speed - metres per second (m s-1)
• Velocity - metres per second plus a direction (m s-1 south)
• Time - seconds (s)
• Acceleration - metres per second per second (m s-2)
• Mass - kilograms (kg)
• Force - kilograms per metre per second per second (kg.m s-2) also 1 newton (N) = 1 kg.m s-2

Question 2

What is distance?

Answer 2

Distance is the total length of the path traveled by an object, regardless of direction. It is a scalar quantity measured in meters (m).

Question 3

What is velocity?

Answer 3

Velocity is the rate of change of displacement with respect to time. It is a vector quantity calculated as
displacement/
time
and measured in meters per second (m/s).

Question 3

What is displacement?

Answer 3

Displacement is the shortest straight-line distance from an object’s initial position to its final position, including direction. It is a vector quantity measured in meters (m).

Question 3

What is speed?

Answer 3

Speed is the rate at which an object covers distance
and measured in meters per second (m/s).

Question 4

What is time?

Answer 4

Time is the continuous progression of events from past to future. In physics, it is often measured in seconds (s) to quantify motion and change.

Question 5

What is acceleration?

Answer 5

Acceleration is the rate of change of velocity with respect to time. It is a vector quantity calculated as
acceleration = v-u/t
and measured in meters per second squared (m/s²).

Question 6

What is force?

Answer 6

Force is an interaction that causes an object to change its motion or shape. It is a vector quantity calculated using Newton’s second law and measured in newtons (N).

Question 7

What is mass?

Answer 7

Mass is the amount of matter in an object. It is a scalar quantity measured in kilograms (kg).

Question 8

What’s instantaneous speed

Answer 8

Instantaneous speed is the exact speed that a body is moving at, at a given instant in time. It is a true measure of the body’s motion for that point in time.

Question 9

What’s average speed

Answer 9

An average speed tells you how much distance a body covers during a certain time span, but it doesn’t tell you much about the actual motion that occurred

Question 10

Newtons 1st Law

Answer 10

Law of inertia - an object at rest will remain at rest, and an object in motion will remain in motion at the same speed and direction, unless it is acted upon by an unbalanced external net force

Question 11

Newtons Second Law

Answer 11

Law of Force and acceleration - F = ma

Question 12

Newtons 3rd Law

Answer 12

For every action there is an equal and opposite reaction