Kinematics

Question 1

Define speed.

Answer 1

The rate at which is distance is travel over a period of time

Question 2

Define Displacement.

Answer 2

The change of position of an object, taken in a straight line including direction

Question 3

The position of an object is

Answer 3

Described relative to a reference point.

Question 4

Define distance.

Answer 4

The length of the path taken. No direction.

Question 5

Scalar is?

Answer 5

Quantities with magnitude only

Question 6

Vectors have?

Answer 6

Magnitude and direction

Question 7

Velocity is?

Answer 7

The change in displacement of an object over a period of time.

Question 8

Acceleration is?

Answer 8

The rate of change to the velocity of an object.

Question 9

Objects thrown at a slow to moderate speed make a?

Answer 9

Parabolic arch through the air

Question 10

Force is?

Answer 10

Any push or pull on an object

Question 11

F=?

Answer 11

ma

Question 12

4 fundamental forces?

Answer 12

Strong
Weak
Electro magnetic
Gravity

Question 13

Types of forces?

Answer 13

Tension
Compression
Friction
Normal
Gravitational

Question 14

Units of force?

Answer 14

N

Kg m/s²

Question 15

Newton’s first law?

Answer 15

An object will remain in its state or motion or rest until acted upon by a non-zero net force

Question 16

Newton’s second law?

Answer 16

A non zero net force acting on an object will cause it to accelerate. The acceleration is directly proportional to the net force acting on it and inversely proportional to its mass. a=F/m

Question 17

Newton’s third law?

Answer 17

For every action there is an equal and opposite reaction.

Whenever one object exerts force on a second object, the second object exerts and equal and opposite force on the first.

Question 18

What is friction?

Answer 18

The force between two surfaces preventing them from sliding past eachother. Solids, liquids or gasses

Question 19

What is the cause of friction?

Answer 19

Inter molecular forces between the atoms and molecules of the two surfaces.

Question 20

Amount of friction depends on what 2 elements?

Answer 20

The magnitude of the forces acting on eachother and the nature of the surfaces.

Question 21

The coefficient of friction is

Answer 21

The constant of proportionality between the force of friction and the normal force of the surface. Ff = u Fn

Question 22

2 types of friction?

Answer 22

Static

Kinetic

Question 23

Newton’s law of universal gravitation?

Answer 23

Gravitational force is directly proportional to the product of the 2 masses and inversely proportional to the square of the distance between them. Fg = G (m1 m2)/r²

Question 24

G = ?

Answer 24

Universal gravitational constant.

6.67 x 10-¹¹ N m² / kg²

Question 25

Cavendish experiment was

Answer 25

2 masses attached to a thin metal rod suspended by a wire. 3rd mass brought close. The force of gravity causes the apparatus to twist. The twist in the wire is then converted to force.

Question 26

Torsion balance is

Answer 26

An instrument used to measure small forces.

Question 27

Explain gravitational fields

Answer 27

A sphere of influence around a mass in which an other mass will feel it's gravitational force. A vector field in the direction of center mass. g = Gm/r²

Question 28

Strongest gravitational force on earth is at?...... Why?

Answer 28

At the poles. They are closer to center mass. The rotation of earth causes a force perpendicular to its gravitational field.

Question 29

Uniform motion is

Answer 29

Consistent change of position in one direction | Consistent velocity.

Question 30

Uniform acceleration is

Answer 30

Consistent change in velocity in one direction. | Consistent acceleration.

Question 31

What is the formula for acceleration given Vf, Vi and t

Answer 31

a = (Vf-Vi)/t

Question 32

Formula for distance, not given time

Answer 32

d = (Vf²-Vi²)/2a

Question 33

Force of gravity on a slope F-applied = F-normal = F-gravity =

Answer 33

Sine ø Cos ø Tan ø or 9.81m/s² x kg

Question 34

Force of Friction equation

Answer 34

(F-normal) x (ü) = Ff | (F-applied) - (Fnet) = Ff

Question 35

Mass of earth

Answer 35

5.98 x 10²⁴ kg

Question 36

Radius of earth at its surface

Answer 36

6.37 x 10^6 m

Question 37

G =

Answer 37

G = 6.67 x 10-¹¹ N m²/kg²

Question 38

Tan =

Answer 38

Sine/Cos