Forces Part 1
Is friction a contact force (C) or a non-contact force (NC)?
Friction is a contact force (C)
True or False? A force cannot be a push, but it can be a pull.
False - it can be both a push and pull
The process of an object moving or being moved is called what?
Motion
If you increase mass, does acceleration increase or decrease?
Increase mass ----> Decrease acceleration
If you increase force, what happens to acceleration?
Increase force ----> Increase acceleration
Is magnetism a contact force (C) or a non-contact force (NC)?
Magnetism is a non-contact force (NC)
Give an example of an unbalanced force.
Answers may vary.
Example: An uneven tug-of-war.
Which of these is FALSE?
a) A rough surface has more friction
b) Friction helps motion
c) Friction slows things down
d) Friction can cause things to come to a stop
b) Friction helps motion
This is false because friction RESISTS motion.
What is acceleration?
a) when you decrease speed
b) when you change direction
c) the rate at which speed changes
d) when an engine gets louder
Newton's third law is about:
a) acceleration & push/pull
b) strength & direction
c) objects staying in motion
d) action & reaction
Newton's third law is about d) action & reaction
Unbalanced forces always cause a change in:
a) air resistance
b) acceleration
c) magnetism
d) motion
Unbalanced forces always cause a change in....
d) motion
How are contact forces different than non-contact forces?
Contact forces require physical contact of two things, in order to happen.
What word would you use to describe "the process of an object moving or being moved?"
Motion
What is the formula to describe Newton's 2nd Law of Motion?
You MUST write the full words, not just the letter abbreviations.
Force = mass x acceleration
What unit can we use to measure force? (This is NOT on the test.)
Newtons (N)
Successfully name at least two types of forces.
Contact forces, Non-Contact forces, Balanced forces, Unbalanced forces
Name one reason why friction can be helpful.
Answers may vary.
Example Answer: Tires have friction to help keep them from sliding on the road.
The rate at which an object is moving defines....
a) acceleration
b) speed
c) movement
d) stamina
b) speed
Newton's 1st Law of motion is also called the Law of ________
Law of "Inertia"
Which of Newton's laws does the following scenario represent?
When you push on the ground to jump, the ground pushes back on you.
Newton's Third Law of Motion
When the forces on an object are equal to each other, the forces are __________ .
balanced
Answer both questions:
1) True or False? Balanced forces can be moving objects.
2) True or False? Balanced forces can be moving objects only if the object is moving at a constant speed
1) True
2) True
What is the formula for speed?
Distance ÷ Time
Newton's first law says an object in motion 1)_______ in motion, and an object at rest stays at 2)________ unless acted on by an 3)________ force.
1) stays
2) rest
3) outside
Newton's third law says that every action has an 1) _______ and 2) ________ reaction.
Must answer both parts!
2) opposite