Top 5 - Forces

Question 1

Explain the difference between scalar and vector quantities, and contact and non-contact forces.

Answer 1

Vector quantities have a magnitude and a direction.
Scalar quantities only have a magnitude and no direction.
When two the to objects have to being touching to make a movement that means that they are contact .
When the two objects don’t have to be touching then the force is a non-contact force.

Question 2

What is the formula for calculating the weigh of an object?

Answer 2

Weight (N) =

Mass (kg) x Gravitational Field Strength (N/kg)

Question 3

Give the formula for calculating the work done by force.

Answer 3

Work Done (J)
-----------------------------------------------------------------------------------
Force x Distance (moved along the lone of action of the force (m))

Question 4

How many joules of work does 1Nm (newton metre) equal?

Answer 4

1 Joule

Question 5

What is the different between an elastic and an inelastic deformation?

Answer 5

Inelastic deformation means that after the force applied is removed it does not return to its old shape or length
Elastic means it does return.

Question 6

Give the equation that relates force, extension and the spring constant of an object.

Answer 6

Force (N) = 
               Spring constant (N/m) x Extension (m)

Question 7

Whats the limit of proportionality?

Answer 7

There is a maximum force above which the graph curves showing that the extension is no long proportional to the force this is known as the limit of proportionality.

Question 8

Give the equation used to find the energy in an elastic object’s elastic potential energy store.

Answer 8

Elastic potential energy = 1/2 × spring constant × (extension x extension)

Question 9

Define a moment.

Answer 9

A moment is a force or several forces that can cause an object to rotate.

Question 10

What is the difference between displacement and distance?

Answer 10

Displacement is when an object has been forced to travel in a given direction of a straight line and it measures the start point to the finish point - Vector Quantity
Distance is the metres travelled by an object - Scalar Quantity

Question 11

What quantities are speed and velocity?

Answer 11

Speed = Scalar
Velocity = Vector

Question 12

State newtons three laws of motion.

Answer 12

Law One - A force is needed to change motion.
Law Two - Acceleration is proportional to the resultant force.
Law Three - Equal and opposite force act of integrating objects.

Question 13

What is the stopping distance of a vehicle?

Answer 13

The displacement of a car from when it first put on the brakes.

Question 14

State the equation for stopping distance.

Answer 14

Stopping Distance = Thinking Distance + Braking Distance

Question 15

What is an average reaction time?

Answer 15

0.2 - 0.9

Question 16

Give the equation for momentum

Answer 16

Momentum = Mass × Velocity