Show:
Friction
Gravity
Measuring Motion
Random
What is a Force?
100
When you put on the brake of a bicycle, what is the force that slows your bike down?
Sliding Kinetic Friction
100
What is gravity?
A force of attraction between two objects due to their masses.
100
If you say,"A bird is going 30mi/hr west." you are stating its _______.
What is Velocity
100
These are the units for Force
Newtons.
100
True or False: An unbalanced force doesn't affect motion.
What is False
200
Name two ways to increase friction acting between objects.
Increase the force pushing them together; Make the surfaces rougher
200
What is the measurement of the force of gravity on an object?
weight
200
In order to determine that motion has occurred, we need to establish a ______________ to compare against
Reference Point
200
These are the units for acceleration
m/s/s
200
Combination of all forces acting on an object is known as____
Net Force
300
Define Friction. Be specific
Friction is a force that opposes motion between two surfaces in contact
300
What is the force that acts between any two masses and pulls them together?
Gravitational force
300
_____ is any change in the speed or direction of an object’s motion.
Acceleration
300
What is the least number of photographs to tell if a horse is moving?
2
300
Are the forces on a kicked soccer ball Balanced or Unbalanced? How do you know?
Unbalanced. Because the ball changes speed and/or direction.
400
All objects have these on their surfaces, no matter how smooth they seem to be
Hills and Valleys
400
The______ of an object tells you how much gravity pulls on it.
Weight
400
__________is the property of matter that keeps an object at rest or keeps it moving in a straight line.
Inertia
400
Explain why astronauts bounce around on the moon.
The moon has less mass than earth, so it exerts less gravitational force on the astronauts than on earth.
400
Name 5 ways in which Unbalanced Forces can change the motion of objects.
1. They can make objects start moving. 2. They can make objects stop moving. 3. They can make objects go faster. 4. They can make objects slow down. 5. They can make objects change direction.
500
One way to reduce friction is to use lubricants. What are the other two ways?
1. Make the surfaces smoother. 2. Change from sliding kinetic to rolling kinetic friction.
500
If an object has a large mass on Earth, what else does it have a lot of?
Weight.
500
What is Centripetal Acceleration?
Acceleration that occurs in circular motion
500
Describe how the amount of force pushing two surfaces together affects friction.
Hills and valleys become more entangled.
500
You are riding a bike. List at least 3 forces in action. Be specific.
Friction: Rolling kinetic friction between wheels and road. Gravity: Weight of person and bike. Normal Force: Upward force balancing out weight. Applied force: Force used to push bike forward.