Embedded Files
Newton's First Law
Newton's First Law
4.1
4.1
State Newton’s First Law of Motion
Task 4.1a
Task 4.1a
View Videos Khan Academy:
4.2
4.2
Define inertia.
Task 4.2a
Task 4.2a
Write a definition of inertia.
4.3
4.3
Identify examples of how inertia affects objects in everyday situations involving motion
Task 4.3a
Task 4.3a
View videos:
Task 4.3b
Task 4.3b
Applying Newton's First Law https://www.khanacademy.org/science/physics/forces-newtons-laws/newtons-laws-of-motion/v/newton-s-first-law-of-motion-concepts?modal=1 [7.13]
Task 4.3c
Task 4.3c
Practising Newton's First Law
4.4
4.4
Predict the motion of objects in a variety of situations in light of this law.
Figure 1. Different forces exerted on the same mass produce different accelerations. (a) Two children push a wagon with a child in it. Arrows representing all external forces are shown. The system of interest is the wagon and its rider. (The weight w of the system and the support of the ground N are also shown for completeness and are assumed to cancel.) The vector f represents the friction acting on the wagon, and it acts opposing the motion of the wagon.
(b) All of the external forces acting on the system add together to produce a net force, Fnet. Fnet = F1 + F2 - f
The 'free-body' diagram shows all of the forces acting on the system of interest. The dot represents the centre of mass of the system. Each force vector extends from this dot. Because there are two forces acting to the right, we draw the vectors co-linearly.
Task 4.4a
Task 4.4a
What is the resultant movement for the diagram at right?
(c) A larger net external force produces a larger acceleration (a′ > a) when an adult pushes the child.
Task 4.4a
Task 4.4a
Draw a free body diagram for the situation at right.
What is the resultant movement?
Check your understanding
Check your understanding
Check your understanding
Check your understanding
Google Sites
Report abuse