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Force

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Force & Motion Thinking Questions Can an object s acceleration be a negative number? Why or why not? Can an object s acceleration be a negative number? – PowerPoint PPT presentation

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Title: Force


1
Force Motion
  • Thinking Questions

2
Can an objects acceleration be a negative
number? Why or why not?
3
Can an objects acceleration be a negative
number? Why or why not?
  • Yes. When an object slows down and the final
    speed is less than the initial speed, the
    objects acceleration will be a negative number.

4
If forces occur in equal but opposite pairs, how
can anything ever move?
5
If forces occur in equal but opposite pairs, how
can anything ever move?
  • According to Newtons third law, the equal and
    opposite forces work on different objects.
  • Read more about this here
  • http//www.mansfieldct.org/schools/mms/staff/hand/
    Lawshowcananythingmove.htm

6
Two crates, one heavy and one light, are at rest
on a waxed floor. Which crate will need a greater
force to provide the same acceleration? Use the
concept of inertia to explain your answer.
7
Two crates, one heavy and one light, are at rest
on a waxed floor. Which crate will need a greater
force to provide the same acceleration? Use the
concept of inertia to explain your answer.
  • The heavy crate has more inertia, so it requires
    more force to make it accelerate.

8
Explain the role of friction in walking on a
sidewalk versus walking on a sidewalk covered
with ice.
9
Explain the role of friction in walking on a
sidewalk versus walking on a sidewalk covered
with ice.
  • Friction between your shoe and the sidewalk
    allows you to push against the sidewalk. Ice
    decreases this friction.

10
You sit on a rock. Your weight is a force acting
on the rock. What force acts on you?
11
You sit on a rock. Your weight is a force acting
on the rock. What force acts on you?
  • The rock provides an upward force that is equal
    to your weight since you are not moving.

12
How is acceleration related to change in speed?
13
How is acceleration related to change in speed?
  • Acceleration is the change in velocity divided by
    the time needed for the change to occur, and
    velocity changes when speed changes.
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