Astro 150 - Week 8

For a moon in a perfectly circular orbit around a planet, which quantity is changing during the orbit?

• speed

• direction

• acceleration

What produces acceleration in a car?

• The accelerator

• The brake

• The steering wheel

• All of the above

Which of the following are Isaac Newton's Laws of Motion?

• Force = Mass * Acceleration

• What goes up must come down

• An object remains at rest, or continues moving in a straight line at constant speed, unless acted on by an outside net force

• Each planet moves in an elliptical orbit around the Sun

• Whenever one object exerts a force on a second object, the 2nd object exerts an equal & opposite force on 1st.

Tags

NGSS.MS-PS2-1

A boy is swinging a rock tied to a rope horizontally above his head. In which direction will the rock go now that the string has broken?

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A moving ball supplies a force that accelerates a small boy. If the same force is applied to a larger mass, it will be accelerated _________ the boy.

• more than

• the same as

• less than

• there is not enough information to answer

Tags

NGSS.MS-PS2-2

In this example of the laws of motion, the force is the _________which accelerates the _________ .

• curb, shopping cart

• shopping cart, kid

• curb, kid

• Moe, Curly

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

When this man fires his gun, which of the following is correct regarding the strength and direction of the forces involved?

• A small force hits the bullet to the right and a large force hits the gun to the left.

• A large force hits the bullet to the right and a small force hits the gun to the left.

• A large force hits the bullet to the right and an equally large force hits the gun to the left.

• A large force hits the bullet to the left and an equally large force hits the gun to the right.

Tags

NGSS.MS-PS2-1

The gravitational force of the Sun is pulling on the Earth. Which is true about the gravitational force that the Earth exerts on the Sun?

• The Earth pulls the Sun toward it with a force that is a lot weaker than the force of the Sun pulling on the Earth.

• The Earth pushes the Sun away with a force equal to the force of the Sun pulling on the Earth.

• The Earth pulls the Sun toward it with a force equal to the force of the Sun pulling on the Earth.

• The Earth pushes the Sun away with a greater force than the force of the Sun pulling on the Earth.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-4

If the Sun has mass = 100, the Earth mass = 5, and the distance between them is 10, which is correct?

• gravity acting on Sun = 50, gravity on Earth = 50

• gravity acting on Sun = 4, gravity on Earth = 4

• gravity acting on Sun = 5, gravity on Earth = 5

• gravity acting on Sun = 5, gravity on Earth = 50

Tags

NGSS.MS-PS2-2

Asteroids A & B exert an equal and opposite gravitational force = 12 on each other. Asteroid A has a mass of 6 and Asteroid B has a mass of 4. Asteroid A’s acceleration = ____, and asteroid B’s acceleration = ____. (HINT: Force = Mass * Acceleration)

• 72, 48

• 3, 6

• 2, 3

• 6, 4

• 4, 6

Tags

NGSS.MS-PS2-2