Chapter 8.3 Resultant force

Question 1

Wha is the definition of a resultant force?

Answer 1

A resultant force is the single force and associated torque (a force that tends to cause rotation) obtained by combining a system of forces and torques acting on a rigid body.
OR
A force equal to the sum of all forces applied to an object.

Question 2

What is the definition of an unbalanced force?

Answer 2

Forces that are equal in size but opposite in direction are called balanced forces. Balanced forces do not cause a change in the motion of objects.

Question 3

What is Newton’s First law of motion?

Answer 3

Newton’s First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

Question 4

What is the definition of inertia?

Answer 4

Inertia is the name for the tendency of an object in motion to remain in motion. Or an object at rest to remain at rest unless acted upon by a force.

Question 5

What happens if the resultant force of an object is zero?

Answer 5

If the resultant force acting on a stationary object is zero, the object will remain stationary. If the resultant force acting on a moving object is zero, the object will carry on moving at the same speed in the same direction

Question 6

How do you calculate the resultant force?

Answer 6

Use Newton’s second law (F=ma)

Force = Mass X acceleration