Newton's Laws of motion

terminal velocity

is the point at which the maximum velocity is achieved and the acceleration is zero

Newton’s 1st Law

an object will remain at rest or move at a constant velocity unless acted upon by a net force

State whether the following statement is true or false: “An object travelling at a constant velocity does not necessarily need a force acting upon it”

Newton’s First Law states that an object will remain at rest or move at a constant velocity unless acted upon by a net force
∙  ∙ In the absence of any force, the net force on the object is zero, which is a condition for the object to move at a constant velocity

Identify correct SI derived units of momentum

Kgms^-1

Identify the correct equation for linear momentum

linear momentum =p=mv where ‘p’ is momentum, ‘m’ is mass, and ‘v’ is velocity

A ball rolls towards a wall, rebounds off the wall, and travels back in along the same path it arrived along. The collision is elastic. The ball has a momentum of −3kg m s−1 when approaching the wall. Calculate the change in momentum of the ball.

6kgms-1

An object has initial momentum p1​ and final momentum p2​. Select the correct equation to calculate the change in momentum.

To find the change, we do: final momentum minus initial momentum
∙  ∙ Therefore Δ⁢p=p2−p1

A ball rolls towards a wall, rebounds off the wall, and travels back in along the same path it arrived along. The collision is elastic. The ball has a momentum of +2kg m s−1 when approaching the wall. Calculate the change in momentum of the ball.

-4kgms-1

Net Force

The vector sum of all forces acting on an object. Also called the resultant force.

Linear

Acting in the same plane, or in a straight line

Newton’s Second Law:

The rate of change of momentum of an object is directly proportional to the resultant force acting upon it and the change in momentum is in the direction of the force

F= delta p/ delta v

Identify the correct equation for impulse

impulse=Force*time

what can momentum be equal to when equation is rearranged?

Impulse

Identify the correct way to determine the impulse from a force-time graph

The area between the graph line and the x-axis

units of impulse?

Ns

Newton’s 3rd Law

when body A exerts a force on body B, body B exerts an equal and opposite force on body A of the same type

Impulse

The force acting on an object multiplied by the time for which it acts

Impulse = Δp = FΔt where Δp = change in momentum, F = average force, Δt = change in time

This is found from Newton's Second Law, which states that F =  Δp / Δt

The Newton

One Newton is the force that gives a mass of 1kg an acceleration of 1ms-2

A tennis player returns a ball to her opponent by hitting it with her racquet. A spectator initially sees the ball travelling towards the player’s racquet and then, after it has been hit, sees it travelling away from her racquet. Assuming that we ignore resistive forces, what happens to the momentum?

The ball has a change in momentum that is proportional to the force applied by the racquet

The change in momentum is in the same direction as the applied force