Forces

What best describes net forces?

• The sum of all forces acting on an object.

• The forces acting upon a net.

• The forces that go in the same direction.

• The sum of all positive forces.

What kind of force is gravity?

• Friction Force

• Contact Force

• Normal Force

• Attraction Force

What is the gravitational strenght on planet earth?

• 8.9 n/kg

• 9.8 N/kg

• 1.6 N/kg

• there is none

The tendency of an object to resist the change in motion is called _______

• friction

• gravity

• inertia

• tension

Normal force acts in ___________ direction to the surface.

• perpendicular

• straight

• vertical

• horizontal

Mass and Weight are the same everywhere in the universe.

• True

• False

Friction is best described as _________?

• The force between two surfaces that move against each other.

• The opposite force of gravity.

• The force in same direction as the force of the motion.

• The force on a surface when it moves.

What is the formula for the second law of Newton ?

• f=m*g

• F=m/a

• F=m*a

• F= d/t

Which best describes the third law of Newton.

• For every Action there is a Force.

• For every Action there is a Reaction.

• An object at motion will stay in motion unless acted upon by an unbalanced force.

• F=m*a

Which best describes the first law of Newton.

• For every Action there is a Force.

• For every Action there is a Reaction.

• An object in motion will stay in motion unless acted upon by an unbalanced force

• F=m*a