Introduction to Forces

Which statement describes a force vector?

• It has magnitude but no direction

• It has direction but no magnitude

• It has both direction and magnitude

• It has constant magnitude but no

  direction

Answer explanation

There are two force vectors in this diagram.

The diagram shows a man using a rope to pull a cart. The man's pull on the handle of the cart

is a tension force that

• has magnitude and direction

• has magnitude only

• has direction only

• has no magnitude nor direction.

Answer explanation

He puts an amount of force (ex. 50 N could be its magnitude) on the rope.

He pulls in a particular direction (ex. west.)

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Which type of force exists when two surfaces touch?

• contact

• gravity

• friction

Answer explanation

What is a PUSH or PULL of an object?

• Motion
• Force
• Friction
• Gravity

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The arrow point of a force vector represents the ______ of the force

• direction

• magnitude

• type

• cause

Each arrow representing a push or a pull in this picture is representing

• force

• gravity

• velocity

• newton

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Two examples of noncontact forces are __________ and __________.

• friction

• gravity

• motion

• magnetism

Answer explanation

Gravity and magnetism occur without anything being touched directly.

Ex. a paperclip is pulled through air toward a magnet

Ex. a pen falls to the ground because of its attraction to Earth's gravitational pull

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Find the three correct answers: Force is

• a push or a pull

• a vector

• the reason that objects change velocity

• the velocity of an object

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This picture is an example of a

• free-body diagram

• force

• spring scale

• Newton

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Which of these are true statements about FORCE?

• The unit of force is the Newton.

• Contact forces include friction and gravity.

• Force is measured with a spring scale.

• A force is a push or a pull.