3. Forces and Motion Flashcards
1
Q
What is Newton’s First Law?
A
- if the forces on an object are balanced, the object will:
1. Continue travelling at a constant velocity
2. Or if stationary -> will remain stationary
2
Q
The same force is applied to two objects with different masses. Which will accelerate the most?
A
Lower mass object
3
Q
Two objects of same mass are pulled with different forces. Which will accelerate the most?
A
Object pulled with higher force
4
Q
What is Newton’s second law?
A
Resultant force= mass x acceleration
F= ma
5
Q
How can friction be reduced?
A
Lubrication eg oil for friction
Streamlined design for air resistance
6
Q
What is an example of useful friction?
A
Brakes on a car
7
Q
What is an example of unuseful friction/
A
Air resistance slowing a plane
8
Q
What is Newton’s 3rd law?
A
If A exerts a force on B, then B exerts the same force on A but in the opposite direction
