Dynamics And Space Flashcards Preview

Nat 5 Physics > Dynamics And Space > Flashcards

Flashcards in Dynamics And Space Deck (21):
1

Scalar

Magnitude

2

Vectors

Magnitude and direction

3

Examples of scalar

Mass
Time
Energy
Distance
Speed

4

Examples of vector

Weight
Force
Momentum
Displacement
Velocity

5

Acceleration

Velocity of an object change each second

6

What does force change

The speed
Direction or
Shape
Of an object

7

What is weight

The force that pulls objects down to the center of the earth

8

What is friction

The force which acts between touching surfaces and tries to stop them moving

9

What is tension

The force carried through a stretched rope or wire

10

What is gravitational field strength

The downward force acting on one kilogram of mass

11

What is Newton's first law

If the forces on an object are balanced the motion of an object does not change

12

What is Newton's second law

If an unbalanced force acts on a mass the mass accelerates

13

What is terminal velocity

When forces are balanced and an object is traveling at a constant velocity

14

What is Newton's 3rd law

When you apply a force on an object the object will apply and equal and opposite force back on you

15

What is a projectile

An object with both horizontal and vertical velocities

16

What happens to the horizontal motion

It travels at a constant speed

17

What happens to vertical motion

Accelerates downwards at 9.8ms-2

18

Why do astronauts appear to be floating

The space station astronauts are in is in free fall
It still has horizontal velocity which prevents it from crashing down to earth

19

What happens if a space shuttle reenters the atmosphere at a too shallow angle

It is reflected

20

What happens if a space shuttle reenters at to steep an angle

It burns up

21

What is instantaneous speed

The speed at one particular point