Dynamics

Question 1

Force

Answer 1

A push or pull that one body exerts on the other

Question 2

Newton’s First Law of Motion

Answer 2

Every object will continue its state of rest or uniform motion in a straight line unless a resultant force acts on it.

Question 3

Newton’s Second Law of Motion

Answer 3

When a resultant force acts on an object of a constant mass, the object will accelerate in the direction of the resultant force. The product of the mass and the acceleration of the object is the resultant force.
F=ma

Question 4

Newton’s Third Law of Motion

Answer 4

If body A exerts a force on body B, then body B will exert an equal but opposite force on A.

Question 5

Action-reaction pair must

Answer 5

1. be of the same type
2. happen at the same time
3. act on different bodies
4. be equal in magnitude but in opposite direction to each other

Question 6

Friction

Answer 6

Friction is a contact force that opposes or tends to oppose motion between surfaces in contact.