Forces & Motion
A push or pull on an object resulting from the object’s interaction with another object.
What is a force?
Is the mutual attraction between all things that have mass.
What is gravity?
The tendency of an object to resist changes in its state of motion.
What is inertia?
Kicking a soccer ball, pushing a cart, riding a bike are examples of what?
Law of Acceleration/Newton's 2nd Law of Motion
For every action, there is an equal and opposite ______.
Reaction
When the sum of all forces acting on an object is zero.
What are balanced forces?
It’s a combination of electrical and magnetic forces.
What is an electromagnetic force?
An object will remain at rest or in motion at a constant speed unless acted upon by an unbalanced force.
What is the Law of Inertia
The formula associated with the 2nd Law of Motion
What is F=ma
True or False: If a swimmer pushes off a wall to propel forward, the wall exerts a weaker amount of force on the swimmer
False
The net force is not equal to zero
What are unbalanced forces?
When an object is falling under the sole influence of gravity.
What is freefall?
If a bicycle comes to a rolling stop with no brakes, what force is acting upon it to make it stop?
Friction
If you push two objects weighing 10 kg and 15 kg with the same force, which will have greater acceleration?
10 kg object
If you are on a skateboard and throw a backpack forward, which direction will you roll?
Backwards
A vehicle has a constant velocity of 55 mph heading east. Are the net forces balanced or unbalanced in this state?
Balanced force
Is the constant value at which objects fall and is independent of an object’s mass, size ,or shape.
What is 9.81 m/s2?
Exists between a stationary object and the surface on which it is resting.
What is static friction?
An object with a mass of 1,100 kg has a force of 2,200 N applied to it. What is the acceleration of the object?
2 m/s2
If two bumper cars traveling at the same speed with the same mass collide, what will happen?
They will bounce back to a similar distance.
Is the change with time of the position or orientation of an object.
What is motion?
Air molecules push against each other & other objects, creating an upward force of friction that slows down objects
What is air resistance?
When a solid object moves through a fluid
What is fluid friction?
If a car’s mass doubles but the force stays the same, its acceleration...
It decreases
Jumping off a boat and causing it to push backward is an example of which Law of Motion?
What is the 3rd Law of Motion?