Newton's Laws

Kinematics is ​ (a)   motion and ​Dynamics is ​ (b)   motion.

• describing
• explaining

T/F: An object can be accelerating even if it is at rest.

• True

• False

​ (a)   said that objects want to be at rest, while ​ (b)   said that objects want to continue doing whatever they are currently doing.

• Aristotle
• Newton

Newton's 2nd Law states that if a Net Force acts on an object, it will undergo an acceleration according to the following equation:

​ (a)   = m ​ (b)  

• a

The ​ (a)   of a 1-kg ball on earth is -9.8 Newtons. The mass of the same ball in space is ​ (b)   and the weight of the same ball in space is ​ (c)   .

• weight
• 1 kg
• 0 N
• mass
• 0 kg
• -9.8 N

Show the free-body diagram of an object that is in free-fall:

Select all the correct statements about the motion of an object given the free-body diagram at the left.

• The object must be accelerating.

• The object is in free fall.

• The object could be moving to the right.

• The object could be moving to the left.

• The object could be slowing down.

Select all the correct statements about the motion of an object given the free-body diagram at the left.

• We cannot determine which direction the object is moving from the free body diagram.

• The object must be accelerating.

• The object is moving to the right.

• The object is moving to the left.

• The object could be slowing down.