10. Forces and motion

Question 1

What is Newton’s first law of motion?

Answer 1

An object at rest will stay at rest and an object moving with constant velocity will continue to move with constant velocity unless an unbalanced force acts on the object

Question 2

What does a resultant force do to an object?

Answer 2

It will cause the object to accelerate in the same direction as the resultant force

Question 3

How do you find the resultant force of two vectors?

Answer 3

Add the vectors

Question 4

What is Newton’s second law of motion?

Answer 4

The force needed to accelerate a particle is equal to the product of the mass of the particle and the acceleration used
F = m a

Question 5

What is the equation for weight?

Answer 5

W = m g
W = weight, m = mass, g = 9.8

Question 6

What is Newton’s third law of motion?

Answer 6

For every action, there is an equal and opposite reaction

Question 7

What are the rules for solving pulley questions?

Answer 7

Pulley is smooth
Tension in the string is the same on either side of the pulley
You can not solve the system as a whole
The system can only be solved in two parts