Force & Motion

Question 1

Whats a vector and scalar quantity?

Answer 1

Vector: Any quantity with a magnitude and direction.
Scalar: Any quantity with a magnitude

Question 2

Whats newtons laws?

Answer 2

1. An object at rest tends to stay at rest and an object in motion tends to stay inmotion in a straight line at a constant speed.
2. F = ma
3. For every action (force) in nature there is an equal and opposite reaction.

Question 3

Whats the difference between mass and weight?

Answer 3

Weight is a force that is due to the earth’s pull ofgravity. Mass is a measure of the inertia possessed byan object (Mass in kg, Weight is N).

Question 4

Whats centripetal force?

Answer 4

a force that acts on a body moving in a circular path and is directed towards the centre around which the body is moving.

Question 5

Whats centrifugal force?

Answer 5

a force that acts on a body moving in a circular path and is directed away from the centre around which the body is moving.

Question 6

Whats newtons law of gravity?

Answer 6

Every object in the universe attracts every other object in the universe with a force proportional to the objects masses.

Question 7

What are keplers laws?

Answer 7

1. planets orbit the sun in the shape of an ellipse.
2. As a planet orbits the sun, a line from theplanet to the sun sweeps across equal areas inequal times.
3. The squares of the orbital periods of the planets are directly proportional to the cubes of the semi-major axes of their orbits.