Unit 2- Forces

Question 1

Force Definition

Answer 1

A push or pull on an object; a vector quantity; measured in Newtons.

Question 2

Equation for Force of Gravity (N)

Answer 2

Fg=mg

Question 3

Newton’s First Law of Motion

Answer 3

Law of inertia; states that if the net external force on an object is zero, the object will remain at rest or continue to move at a constant velocity.

Question 4

Newton’s Second Law of Motion

Answer 4

If an object experiences an external force (where Fnet doesn’t equal 0) the object will accelerate in the direction of the force.

Question 5

Equation for Newton’s Second Law

Answer 5

Fnet=ma

Question 6

Newton’s Third Law of Motion

Answer 6

For every action, there is an equal and opposite reaction.

Question 7

Mass Definition

Answer 7

The quantity of matter in a body; measured in kg; absolute.

Question 8

Weight Definition and Equation

Answer 8

The force of gravity affecting an object; measured in N.

Weight=mass x gravitational acceleration

Question 9

Static Friction (Ffs) Definition

Answer 9

Force that prevents an object from starting to move.

Question 10

Kinetic Friction (Ffk) Definition

Answer 10

Force that opposes an object that is already moving.

Question 11

Coefficient of Static Friction Equation

Answer 11

Ms=Fsmax/Fn

Question 12

Coefficient of Kinetic Friction Equation

Answer 12

Mk=Fk/Fn