8th Grade Midterm Practice questions 1

Newton's 1st Law is also known as the Law of

• Gravity

• Inertia

• Force

Which of the following best describes what happens to the force of attraction if the distance between two objects is increased?

• It varies.

• It increases.

• It stays the same.

• It decreases.

Tags

NGSS.MS-PS2-4

What is Newtons 2nd law of motion?

• Force= Mass multiplied by acceleration

• An object at rest stays at rest unless acted on an unbalanced force.

• For every action there is a equal and opposite re-action.

• Law of gravity

Tags

NGSS.MS-PS2-2

What is Newtons 3rd law of motion?

• Force= Mass multiplied by acceleration

• An object at rest stays at rest unless acted on an unbalanced force.

• For every action there is a equal and opposite re-action.

• Law of gravity

Tags

NGSS.MS-PS2-1

The gravitational force between two objects is most affected by their

• motion and volume

• motion and distance apart

• mass and volume

• mass and distance apart

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

The force that holds the planets in orbit around the sun is called

• magnetic

• tension

• gravity

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

The wheels and gears of a machine are greased in order to decrease

• potential energy

• efficiency

• friction

• output

Tags

NGSS.MS-ETS1-1

A student correctly determined the density of two rocks. If the volumes of the two rocks are equal, the rock with the greater density has a

• rounder shape

• smoother surface

• greater mass

• smaller size

A heavyweight boxer winds up and punches a punching bag. Which of the following are true?

• The punching bag exerts more force than the fist.

• The fist exerts more force than the punching bag.

• The fist creates the action force and the punching bag creates the reaction force.

• There is no force between the two objects because they are balanced.

Tags

NGSS.MS-PS2-1

Two types of contact forces are

• friction and tension

• gravity and pushing

• magnetism and pulling

• friction and electrostatic