Vocabulary
A ____ is a push or pull and can make an object stop, speed up, slow down, or change direction.
Force
Speed in a particular direction is ________
Velocity
Which of the following is not a force?
Newton
Gravity
Friction
Magnetism
Newton
Do two cats running at the same speed in the opposite direction have the same velocity?
No, they are moving in different directions.
Which graph shows something moving very slowly? (picture attached in Teams post)
B
The force of __________ attracts all objects towards each other.
Gravity
How far an object moves in a given amount of time is its __________.
Distance / Time
Speed
What force causes things to fall toward the center of the Earth?
Gravity
Yes because their direction is constantly changing.
Which of the following is not a force?
Gravity, Air Resistance, Buoyancy, Applied Force, Joule, Friction, Magnetism.
Joule
When an object's motion changes, you know that the forces acting on it are ____________.
Unbalanced
An object's ________ depends on its velocity and mass.
What force causes a ball rolling across the grass to slow down and stop?
Friction
If two people are roller skating down the road in the same direction and one passes the other, do they have the same velocity?
No, they are traveling at different speeds.
Inertia explains why____
- friction can be overcome for all objects.
- people in a car move forward in their seats when the car stops quickly.
- gravitational forces are stronger on Earth than on the moon or other satellites.
- the ground pushes against your feet when you run.
People in a car move forward in their seats when the car stops quickly.
_________ act on an object without causing a change in the object's motion.
Balanced Forces
Adding or subtracting individual forces gives a combined force called a _______.
Net force.
If two dogs pull on a rope and neither moves, the forces must be __________.
Balanced
What is the velocity of a bottle rocket that goes 15 feet north in 5 seconds?
3ft/sec north (direction matters for velocity)
If an equal force acts on each of the following objects, which will go the furthest?
Golf Ball
Football
Soccer Ball
Baseball
Golf Ball- it has the smallest mass.
______ is a force of attraction between magnets and magnetic objects.
When you slide one object over another, the force of ________ acts in the opposite direction.
Friction
Applied Force, Inertia, Gravity, Friction
A train travels 500 miles south in 10 hours. What is the average speed?
50 mph (direction does not matter for speed)
The property of matter that resists any change in an object's motion is ________.
Inertia