NEWTON’S FIRST LAW
This is another name for Newton’s First Law, which states that an object in motion stays in motion unless acted upon by an unbalanced force.
What is the law of inertia?
Newton’s Second Law is usually written with this simple equation.
What is F = m·a (force equals mass times acceleration)?
Newton’s Third Law says that for every action, there is what?
What is an equal and opposite reaction?
This force pulls objects toward the center of the Earth.
What is gravity?
When all the forces on an object cancel each other out and its motion does not change, the forces are called what?
What are balanced forces?
According to Newton’s First Law, an object at rest will remain at rest unless acted upon by a net external force.
What is an unbalanced force?
If you push a small cart and a big cart with the same force, which one will have the greater acceleration?
What is the small cart?
You push on a wall and the wall pushes back on you with the same amount of force. This pair of forces is called what?
What are action–reaction force pairs?
This contact force acts in the opposite direction of motion when you slide a book across a table.
What is friction?
When the net force on an object is not zero and the object speeds up, slows down, or changes direction, the forces are called this.
What are unbalanced forces?
You slam on the brakes in a car, and your body lurches forward. This law explains why that happens.
What is Newton’s First Law of Motion?
According to Newton’s Second Law, if the net force on an object doubles and the mass stays the same, what happens to the acceleration?
What is it doubles?
A rocket moves upward because the gases push downward on the ground and air, and those push back up on the rocket. This is an example of this law.
What is Newton’s Third Law of Motion?
The force that a surface exerts upward on an object resting on it (like a table on a book) is called this.
What is the normal force?
A box is pushed to the right with 10 N and friction pushes left with 10 N. The net force on the box is this.
What is 0 N?
The tendency of an object to resist a change in its motion is called what?
What is inertia?
A 2 kg object accelerates at 3 m/s². According to Newton’s Second Law, the net force on the object is this many newtons.
What is 6 N?
When you jump off a boat, you move forward and the boat moves backward. The boat’s motion is due to this law.
What is Newton’s Third Law?
This is the force applied by a rope, string, or chain when it is pulled tight.
What is tension?
A box is pulled to the right with 15 N and to the left with 5 N. What forces are this kind, and what is the net force?
What are unbalanced forces, and what is 10 N to the right?
Compared to a small rock, a boulder has more of this property, which makes it harder to start or stop its motion.
What is inertia (or mass, which gives it more inertia)?
If an object’s mass is 5 kg and it experiences a net force of 20 N, its acceleration is what?
What is 4 m/s²?
A hammer hits a nail with a large force. The nail hits the hammer with this size and direction of force.
What is an equal force in the opposite direction?
This is the net, or overall, force acting on an object when you combine all the individual forces.
What is the resultant (or net) force?
If an object is moving at a constant velocity in a straight line, what is the net force acting on it, and the forces must bewhat type?
What is 0 N, and what are balanced forces?