MECHANICS - DYNAMICS - MOTION

Question 1

Newtons 1st Law

Answer 1

An object in motion stays in motion, an object at rest stays at rest unless acted upon an outside force.

Question 2

Newton’s 2nd Law

Answer 2

F = ma

Force = mass x acceleration

Question 3

Newton’s 3rd Law

Answer 3

For every action, there is an opposite and equal reaction

Question 4

What is a FORCE

Answer 4

A push or pull applied by one object and experienced by another object

Question 5

What is NET FORCE

Answer 5

The single force that could replace all the individual forces acting on an object and produce the same effect. Forces acting in the same direction add together to determine the net force. Forces actin in opposite directions subtract to determine the net force.

Question 6

what is WEIGHT

Answer 6

weight is the force of a planet on an object near that planet. for example: an object weighs more on the earth than the moon.

Question 7

what is FORCE OF FRICTION

Answer 7

the force of a surface on an object

Question 8

what is KINETIC FRICTION

Answer 8

the friction force when something is moving along the surface and acts opposite the direction of motion

Question 9

what is STATIC FRICTION

Answer 9

the friction force between two surfaces that aren’t moving relative to one another

Question 10

what is NORMAL FORCE

Answer 10

is also the force of a surface on an object. the normal force acts perpendicular to the surface

Question 11

what is COEFFICIENT OF FRICTION

Answer 11

the number that tells how sticky 2 surfaces are

Question 12

what is NEWTON’S 3RD LAW

Answer 12

says that the force of OBJECT A on OBJECT B is equal in amount and opposite in direction to the force of OBJECT B on OBJECT A

Question 13

what is NEWTON’S 2ND LAW

Answer 13

states that an object’s acceleration is the net force it experiences divided by its mass, and is in the direction of the net force

Question 14

what 2 forces can act on an object without contact

Answer 14

gravitational and electrical forces

Question 15

what is MOMENTUM

Answer 15

a moving object’s momentum is its mass times its velocity. momentum is always in the direction of motion

Question 16

what is IMPULSE

Answer 16

impulse is defined as a force multiplied by the time during which that force acts. the net impuls on an object is equal to the change in that object’s momentum

Question 17

what is a SYSTEM

Answer 17

a system is made up of several objects that can be treated as a single thing. It’s important to define the system you are considering before you treat a set of objets as a system.

Question 18

Define “Projectile”

Answer 18

An object in free fall.

Question 19

What if an object is launched at an angle - how would you describe the vectors?

Answer 19

You treat the horizontal and vertical vectors separately.

Question 20

In projectile motion in which launched at an angle, describe the important traits of the horizontal vector

Answer 20

There is NO horizontal acceleration - therefore an object would move at constant speed. Acceleration = 0

Question 21

A projectile is launched at an angle - describe the vertical vector.

Answer 21

The vertical vector is influenced by the acceleration of gravity and is represented by - 10 m/s/s

Question 22

Describe how you would setup a projectile launched at an angle word problem.

Answer 22

You setup 2 kinematic charts. One chart is for the horizontal component and the 2nd chart is for the vertical component.

Question 23

A projectile is launched at an angle - what is the trig function to calculate the horizontal component for velocity?

Answer 23

v(cos Ø)

Question 24

A projectile is launched at an angle - what is the trig function to calculate the vertical component for velocity?

Answer 24

v (sin Ø)

Question 25

In the horizontal kinematic chart for projectiles, what can we assume with the horizontal variables?

Answer 25

The initial and final velocity is the same. Time is the same as vertical kinematic chart. Acceleration is zero.

Question 26

In the vertical kinematic chart for projectiles, what can we assume with the vertical variables?

Answer 26

Initial velocit is v(sinØ), acceleration is -10m/s/s, and generally displacement delta x = 0 or displacement = 0