Chapter 21 Flashcards
(10 cards)
1
Q
What is Newton’s First Law?
A
An object continues at constant velocity/ at rest unless acted upon by an external force.
2
Q
What is Newton’s Second Law?
A
F = ma.
3
Q
What is 1N equal to?
A
1 kgms^-2.
4
Q
What is the resultant force?
A
Single force producing same acceleration as many forces acting together - add vectors of original forces.
5
Q
What are the different types of forces?
A
Driving force, braking force, frictional force, air resistance, tension, thrust.
6
Q
What does it mean if a surface is smooth?
A
No friction.
7
Q
What does light mean?
A
No mass.
8
Q
What does inextensible mean?
A
Doesn’t stretch.
9
Q
What is weight equal to?
A
W = mg (direction towards centre of Earth).
10
Q
When is an object in equilibrium?
A
When the resultant force is 0.
