Module 5

Question 1

A student conducts an experiment to find the acceleration due to gravity. They conclude that the acceleration is 9.74m/s^2. What is their %accuracy (g=9.81m/s^2)

Answer 1

0.71% (2dp)

Question 2

What is the purpose of a low-Earth orbit?

Answer 2

Military and Earth observations.

Question 3

What is the definition of escape velocity?

Answer 3

Escape velocity is the minimum velocity needed for a satellite to escape its orbit.​

Question 4

What are the forces acting on the car while turning a horizontal corner?

Answer 4

Weight Force
The Normal Force
Centripetal Force

Question 5

What does ‘G’ represent in the formula

Answer 5

G = universal gravitational constant​

Question 7

What is the unit for torque?

Answer 7

Newton Metre (Nm)

Question 8

What unit is distance measured in in Newtown’s Law of Universal Gravitation

Answer 8

(m) metres

Question 9

Fill in the blank: The magnitude of the attractive force between two objects is proportional to the product of their masses, and _________ __________ to the square of the distance between them.

Answer 9

inversely proportional

Question 10

What angle should the force be from the lever arm to provide maximum torque

Answer 10

90 deg or perpendicular

Question 11

What is the formula for the strengh of a Gravitational Field

Answer 11

F = GMm/r^2

Question 13

What is the formula for total potential energy of a planet/satellite in orbit?

Answer 13

U = -𝑮𝑴𝒎/𝒓

Question 14

What unit is gravitational potential energy measured in?

Answer 14

Joules

Question 15

What energies give the total energy for a satellite in orbit?

Answer 15

Gravitational potential energy (U) and Kinetic energy (K)

Question 16

Why is the total energy of a satellite in orbit negative?

Answer 16

The gravitational potential energy of the total energy is negative (U=-GMm/r)

Question 17

Kepler’s 1st Law of Motion

Answer 17

Planets move in elliptical orbits with the Sun as a focus

Question 18

Kepler’s 2nd Law of Motion

Answer 18

A planet covers the same area of space in the same amount of time no matter where it is in its orbit

Question 19

Kepler’s 3rd Law of Motion

Answer 19

A planet’s orbital period is proportional to the size of its orbit (its semi-major axis)

Question 20

Which component stays constant during the trajectory of projectile motion

Answer 20

Horizontal

Question 21

What is the expression for the vertical component of velocity?

Answer 21

ux = sinθ

this aint right

Question 23

What is the formula for the instantaneous velocity of an object in circular motion?

Answer 23

v = 2πr/T

Question 24

What shape of motion does a projectile follow

Answer 24

Parabolic

Question 25

If two balls are rolled off a table at the same time with different horizontal velocities, will the balls hit the ground at the same time?

Answer 25

Yes the balls will hit the ground at the same time, two objects falling under the influence of gravity from the same height will reach the ground simultaneously, regardless of their horizontal velocities

Question 26

The centripetal acceleration formula

Answer 26

ac = v2/r

Question 27

What equals 0 at the top of a projectiles arc?

Answer 27

Vertical component of acceleration (uy) ## Footnote Not right, should be vertical velocity

Question 28

What is the formula for the rate of change for the angular position of a rotating body?

Answer 28

w=2πf

Question 29

At the max height of a projectile, what is it's vertical velocity

Question 31

What does the mass x velocity2 / radius equal?

Answer 31

Centripetal force

Question 32

How does kinetic energy change as orbital radius increases?

Answer 32

Decreases

Question 33

What direction is the normal force relative to a car on a banked corner?

Answer 33

perpendicular to the banked surface

Question 34

What are the forces acting on an object on a banked turn?

Answer 34

Weight Force The Normal Force Centripetal Force

Question 35

What are the forces acting on a mass attached to a string experiencing uniform circular motion?

Answer 35

Tension Weight Force

Question 36

How does gravitational potential energy change as orbital radius increases?

Answer 36

Increases