Dynamics (introduction)

What is the S.I. unit of force?

• m

• N

• Pa

• J

Which of the following is NOT a contact force?

• Normal reaction force

• Frictional force

• Gravitational force

• Tension

The object is falling. What does the downward force represent?

• friction

• air resistance

• weight

The ball is falling. What is the upward force called?

• tension

• friction

• air resistance

What is the resultant force acting on the box?

• 2.0 N

• 3.0 N

• 5.0 N

• 8.0 N

How will this box move?

• The box will move to the right with constant speed.

• The box will accelerate to the right.

• The box will not move.

What is the resultant force acting on this box?

• 0 N

• 3.0 N

• 6.0 N

Which are the possible motions of the box? (more than 1 answer)

• The box will accelerate to the right.

• The box will stay at rest.

• The box will move at a constant speed.

• 1.0 kg

• 2.0 kg

• 3.0 kg

• 5.0 kg

• 0 N

• 10 N