Vocabulary
This pulls objects to its center of the Earth. It keeps you grounded.
Gravity
Which force pulls you down a playground slide?
Gravity
A toy car rolling along different surfaces will experience different amounts of friction. A toy car would encounter the most friction when rolling on which surface?
A rough surface (for example: a sandy beach, over grass, over rocks)
____ is a force that opposes the motion of an object by slowing it down.
Friction
Ms. Garcia's class and Ms. Kirk's class are playing tug-of-war. After several minutes, the students notice that the rope has not moved at all. What is one possible cause of this?
The two classes have created a balanced force.
True or False: Adding more force to an object will cause the object to slow down.
False. More force equals more speed
_____ is a force that causes an object's motion to remain unchanged, while _____ is a force that causes an object's motion to change.
1. Balanced force
2. Unbalanced force
A hairdryer is used to push an object across a flat surface. This is an example of an ________ force.
Unbalanced
Which car will experience the most friction?
A) A car driving on pavement
B) A car driving on ice
C) A car driving on dirt
______ is the change in the position of an object over time.
Motion
Two students are racing cars down a hallway. The first car is driving over the carpet, while the second car is driving over tile.
The second car (driving over the tile) is the winner.
What is the reason for this?
The friction from the carpet causes the first car to lose some of its speed.
Some students apply force to a toy car on a ramp to push it down. The students measure how fast the car rolls down the ramp. If students want to increase the speed of the car down the ramp, what should they do?
Increase the force applied to the car.
A ____ is a push or pull of an object.
Force
Can you name the five vocabulary words that we have discussed today?
1. Gravity
2. Friction
3. Unbalanced forces
4. Balanced forces
5. Motion
Robert's water bottle is resting on his desk. Robert turns and accidentally knocks his water bottle off of the table. It crashes to the ground and spills everywhere. What force is pulling the water bottle towards the ground?
Gravity