Forces
This is a force.
What is a push or a pull?
Newton's 1st Law is known as the law of ____.
What is inertia?
Newton's 2nd Law can be written as __.
What is F = m*a?
Newton's 3rd Law says...
What is "For every action, there is an equal and opposite reaction."?
Draw the FBD: An book is resting on a table.
- circle/square
- 2 arrows extending from circle/square
- down arrow, gravity; up arrow - normal
This force is ALWAYS present on Earth.
What is gravity / gravitational force?
Inertia can be defined as _____.
What is an object's tendency to resist a change in motion.
The force of gravity on an object is also known as its ___.
What is weight?
As a book rest on a table, the action force is ___, and the reaction force is ____.
Draw the FBD: An elevator, attached to a strong cable, is accelerating to the highest floor of a tower.
- circle/square
- 2 arrows
- down, gravity; up, tension & longer than down
This force acts opposite motion on a surface.
What is friction?
Objects accelerate due to ____ forces.
An object with a mass of 30 kg is accelerating at 3.5 m/s^2. The force that is acting on it is ___ Newtons.
What is 105 N?
As a skydiver falls through the air, the action-reaction pair is ___ and ___.
What is gravity and air resistance?
Draw the FBD: A child is pushing their friend in a wagon across dirt to the right at a constant speed.
- 4 arrows
- down (gravity), up (normal), right (applied), left (friction)
- all arrows should be the same length
This force is present when a string, rope, or cable is attached to an object.
What is tension?
To determine whether forces are balanced or unbalance, you should ___.
What is calculate the net force?
An object weighing 50 N is moving across a shipyard. It experiences an applied force of 60 N, and an equal friction force of 60 N, and moves at a constant velocity. The acceleration of the object is ____.
What is 0 m/s^2?
A car hits a bug, and a bug hits a car with _____ force.
a) lesser force
b) the same
c) greater force
What is b) the same force?
Draw the FBD: A car is coasting to a stop
- 3 forces
- down (gravity), up (normal), left (friction)
This force acts perpendicular to a surface when an object is on it.
What is the normal force?
True or False: If the net force on an object is zero, then the object is not moving. Explain.
False: It could be at rest OR it could be moving at a constant velocity.
An object that weighs 15 N is being acted upon by 45 N of air resistance. Its acceleration is ___ and is going in this direction.
What is 20 m/s^2, up?
A golf ball and a bowling ball collide. If they exert an equal force on each other, they experience different accelerations because ___.
What is their masses are different?
Draw the FBD: An object has a mass of 3 kg. The net force on it is 40 N, and the force of friction is 16. Label the Fg, Fn, Ff, and calculate Fapp.
Fg = 30, Fn = 30, Ff = 16, Fapp = 56