P2.2 types of force

Question 1

What is resultant force

Answer 1

Overall force acting on an object

Question 2

How to find magnitude of the resultant force

Answer 2

Pythagorean theorem

• R² =16²+12²
• R²=400
• R=√400=20N

Question 3

Newton’s first law

Answer 3

• If an object is stationary it’s stays stationary
• if an object is moving at a constant speed spit stays constant

Question 4

Force equation

Answer 4

• F=MxA
• force=massx acceleration

Question 5

Momentum equation

Answer 5

P=m x v

Momentum is vector

Question 6

what is a contact force

Answer 6

• forces that act between two objects physically touching each other
• eg tension

Question 7

what is a non contact force

Answer 7

a non contact force is a force between objects that are not physically touching each other

Question 8

terminal velocity

Answer 8

At terminal velocity, the object moves at a steady speed in a constant direction because the resultant force acting on it is zero

Question 9

stages of falling

Answer 9

1. at the start, the object accelerates downwards due to the force of gravity
2. as the object’s speed increases, frictional forces such as air resistance or drag increase
3. at terminal velocity, the weight of the object due to gravity is balanced by the frictional forces, and the resultant force is zero

Question 10

Recall and apply Newton’s third law

Answer 10

whenever two objects interact, they exert equal and opposite forces on each other.

• act on two different objects
• are of the same type (eg both contact forces)

Question 11

define power

Answer 11

Power is the amount of energy that is transferred per second.

Question 12

power equation

Answer 12

• power(w)= work done(j)/time(s)
• p=E/t

Question 13

work done equation

Answer 13

work done = force x distance