Physical Science 12A Quiz

What is a force?

• a collision of two objects

• a push or pull on an object

• the motion of objects

• the resistance of two objects when they touch each other

What is the unit of force?

• galileo

• kg times m

• m /s squared

• newton

Which of the following is a contact force?

• electric force

• friction force

• gravitational force

• magnetic force

Any change in motion must be initiated by a(n) __________ force.

• contact

• unbalanced

• field

• balanced

Which of the following is the result of a field force?

• a tossed ball falls to the ground

• the 8th graders win against the 9th graders in tug of war

• an apple press squeezes out apple juice

• an airplane is jostled by wind shear

Multiple, simultaneous forces that cancel each other out are ___________________ forces.

• accelerating

• summative

• balanced

• unbalanced

Any change in the motion of an object must be caused by a force.

• true

• false

Any object in motion is experiencing unbalanced forces.

• true

• false

Objects must either touch or come very close in order to affect each other with forces.

• true

• false

Balanced forces cause an object, if it is in motion, to maintain its motion

• true

• false