Forces |
#1 |
What is a balanced force? |
Two forces of equal strength push or pull on an object in opposite directions |
#2 |
All forces have 2 things. What are these? |
strength (magnitude) and direction |
#3 |
How do electric and magnetic forces act on different objects? |
They either push or pull objects |
#4 |
If a rock has a larger mass, the force on the mass must be _____ to give it a large acceleration |
large |
#5 |
What makes your body rise out of your seat at the top of a hill in a rollercoaster? |
Inertia |
Newton's Laws |
#1 |
What is Newton's First Law? |
An object in motion stays in motion unless a force acts on it. An object at rest stays at rest unless a force acts on it. |
#2 |
What is Newton's Second Law? |
The force acting on an object can cause the object to speed up, slow down, or change direction. |
#3 |
What is Newton's Third Law? |
When one object exerts force on a second object, the second object exerts force on the first. These forces are equal in strength and opposite in direction. |
#4 |
The greater the net force acting on an object, the ________ the acceleration of the object. |
greater |
#5 |
What happens when an object accelerates? |
Its speed or direction changes |
Wild Card |
#1 |
Why does a car keep rolling even if it runs out of gas? |
It has inertia |
#2 |
What kind of surface would slow a marble down as it rolled across the floor. |
A surface with friction (ex. grass, carpet, sand) |
#3 |
If you were building a car to enter a downhill race, what can you do to make your car go as fast as possible? |
Make the car heavier to move faster down hill and give it smooth shape to reduce air resistance. |
#4 |
What is a non-contact force that acts on a baseball after a pitcher has thrown the ball? |
Gravity gradually pulls the baseball down. |
#5 |
What is one contact force that acts on a baseball after a pitcher has thrown the ball? |
Air resistance slows the baseball as it moves through the air |