chapt 4 (dynamics)

Question 1

forces affects? (1) which is controlled by? (1)

Answer 1

motion of object.
Newton’s three laws.

Question 2

effect of balanced forces on a body? (1)

Answer 2

body will remain at the same position as acceleration=0 , Fnet = 0.

Question 3

effect of unbalanced forces on a body? (1)

Answer 3

body will accelerate in the direction of the Fnet.

Question 4

ways where a force may change the motion of a body? (4)

Answer 4

• Body at rest will move.
• Moving body increases/ decreases in speed.
• moving body changes direction.

Question 5

what is friction?(1) and the effects of friction on the motion of a body? (2 ea)

Answer 5

contact force that opposes motion between surfaces in contact.

Positive effects:
- Walk without slipping
- Moving objects able to slow down when needed

Negative:
- Result in wear and tear
- Cars are less efficient