Natalie, Isabella, Roberto

Question 1

Vocabulary: What is Energy?

Answer 1

The ability to do work

Question 2

What is Gravity?

Answer 2

A force that attracts all objects toward each other.

Question 3

What is kinetic energy?

Answer 3

A form of energy that an object or a particle has by reason of its motion.
Example of kinetic energy: A moving car

Question 4

Definition of work

Answer 4

Measure of energy transfer that occurs when an object is moved over a distance by an external force

Question 5

What is the 1st Kepler’s Law?

Answer 5

Every planet’s orbit is an ellipse with the Sun at a focus

Question 6

What is Kepler’s 2nd Law?

Answer 6

A line joining the Sun and a planet sweeps out equal areas in equal times

Question 7

What is Kepler’s 3rd Law?

Answer 7

The square of a planet’s orbital period is proportional to the cube of the semi-major axis of its orbit.

Question 8

A person throws a pumpkin at a horizontal speed of 4.0 m/s off a cliff. The pumpkin travels 9.5m horizontally before it hits the ground.
Find the vertical displacement.

Answer 8

The pumpkin’s vertical displacement is H=27.76m

Question 9

What is an ellipsis?

Answer 9

It is a closed, curved shape which has two foci. The distance between the two foci is proportional to it’s eccentricity.

Question 10

Compare the ‘g’ value experienced by a 100kg elephant and a 1g fly, which both stand on the earth’s crust side-by-side.

Answer 10

The ‘g’ value is the same- g is independent of mass other than that of the central, larger mass (M)

Question 11

What direction of rotation is the Earth?

Answer 11

West to East

Question 12

What is inertia?

Answer 12

The resistance of any physical object to any change in its velocity.

Question 13

What is an Angular displacement?

Answer 13

The change in the angle as an object rotates

Question 14

A player kicks a football from ground level with an initial velocity of 27.0 m/s, 30.0° above the

Answer 14

2.8 s

Question 15

What is the formula for momentum?

Answer 15

p = mv

Question 16

A rock is thrown horizontally from a cliff at 25 m/s.

What will its horizontal and vertical velocities be after 2.0 s?

Answer 16

a) horizontal: 25.0 m/s, vertical: -19.6 m/s

Question 16

Formula for kinetic energy

Answer 16

K.E. = 1/2 m v2

Question 17

If mass stays the same
and distance increases
then the force of gravity…

Answer 17

decreases

Question 17

What is the Law of Conservation of Energy?

Answer 17

Energy may change form, but it cannot be created or destroyed under ordinary conditions

Question 18

What two factors keep the plants in orbit?

Answer 18

inertia and gravity

Question 18

Equation for work

Answer 18

w(ork) = f(orce) x d(istance)

Question 19

How does newtons first law of universal graviton apply to earth and the moon?

Answer 19

Earth pulls on the moon and every object attracts another object

Question 19

Equation for power

Answer 19

p(ower) = w(ork) / t(ime)

Question 20

How does distance affect the strength of the force of gravity?

Answer 20

The bigger the distance the weaker the gravitational pull

Question 21

What is the law of universal graviton?

Answer 21

States every object in the universe attracts every other object