Forces

Question 1

What is the equation for weight?

Answer 1

weight (N) = mass (kg) x gravitational field strength (N/kg)

W = mg

Question 2

What is the equation for moment of a force?

Answer 2

moment of a force (Nm) = force (N) x distance (m)

M = Fd

Question 3

What is the equation for a resultant force?

Answer 3

force (N) = mass (kg) x acceleration (m/s^2)

F = ma

Question 4

What is Newton’s first law?

Answer 4

It states that an object will remain at rest, or continue to move at a constant velocity unless acted upon by an external force.

Question 5

What is Newton’s second law?

Answer 5

It states that a resultant force greater than 0 produces/causes acceleration of a (constant) mass

• if the resultant force is doubled, the acceleration will be doubled.
• if the mass is doubled the acceleration will be halved
• F = ma

Question 6

What is Newton’s third law?

Answer 6

It states that for every action there is an equal and opposite reaction.

Question 7

What is inertia?

Answer 7

An objects reluctance to move or slow down. The heavier the object is, the greater the inertia.