P2.2

Question 1

Contact force

Answer 1

Force that acts on an object through physical contact. E.g pushing or pulling an object

Question 2

Friction

Answer 2

A resistive Contact force that acts to oppose the relative motion between two surfaces. - object being pushed along a surface, there will be friction acting on it in the opposite direction.

Question 3

Non-contact forces

Answer 3

Forces between two objects that arent touching so acts through a field.
E.g: electrostatic, magnetic and gravitational

Question 4

Interaction pair

Answer 4

Pair of equal and opposite forces acting on two different objects.

E.g: person leaning on wall - person PUSHES on wall and wall PUSHES BACK on person. Equal and opposite forces, example of Newton’s 3rd law

Question 5

Resultant force

Answer 5

The single force that can replace all the individual forces acting on an object and have the same effect. Overall force on a point or object

Question 6

What does the resultant force decide?

Answer 6

Whether object will accelerate, decelerate or have steady speed

Question 7

What to do if a number of forces act at a single point?

Answer 7

Replace with a resultant force. This has the same effect on the motion as the original forces acting altogether

Question 8

Free body diagram

Answer 8

A visual representation of the forces that act on an object.

Question 9

Zero resultant force means?

Answer 9

Object is either stationary or moving at a steady speed.

Question 10

Equilibrium

Answer 10

When an object has zero resultant force, the forces on the object cancel eachother out.