Types of Forces
Newton's First Law
Newton's Third Law
Newton's Second Law
100
the force the supports an object sitting on a surface
normal force
100
An object is at rest and all forces are balanced. What will the object do?
Stay at rest
100
An elephant pushes a wall the the right.
Describe the reaction force.
The wall pushes the elephant to the left.
100
Force = ?
mass * acceleration
200
a force exerted by a specific person or object
applied force
200
What will change a moving object's direction?
An unbalanced force
200
Reaction forces have an _____ magnitude and _____ direction.
Equal, opposite
200
Ms. P is pushing a box. It's mass is 4kg and it is moving at 15 m/s^2. What is the force on the object? (units are required)
60 Newtons
300
an attractive force that pulls us to the ground
gravitational force
300
An object is moving at a constant velocity and all forces on it are balanced. What will the object do? Be specific.
Stay in motion with constant velocity (or constant speed and constant direction)
300
Two people push each other. Which is true?
A. The person with more mass exerts more force.
B. The person with more inertia exerts more force.
C. Both people exert the same force.
D. They exert different forces, but there is not enough information to say more.
C
300
An object has a mass of 0.25 kg and is moving at 12 m/s^2. What is the force on the object? (units are required)
3 Newtons
400
the force exerted by a surface that goes against an object's motion
friction (or frictional force)
400
Why does a ball rolling on the ground slow down?
Friction is an unbalanced force acting on it.
400
Identify an action-reaction pair in this picture:
What is for every action, there is an equal and opposite reaction.
400
Mr. Alves pushes on a desk with 5 Newton's of force. It accelerates at a rate of 2 m/s^2. What is the mass of the desk? (units are required)
2.5 kg
500
a force exerted the air when something is falling
air resistance
500
An object is moving at constant velocity. What is required to keep it moving at constant velocity?
Nothing (or balanced forces)
500
How does a rocket move upward from the ground?
The rocket pushes the ground down, and the ground pushes the rocket up.
500
Ms. Bouvier is using 20 Newton's of force to push a table in the cafeteria. If it accelerates at 2 m/s2, what is the mass of the table? (units are required)
10 kg