FORCE Newton’s Laws: 1. 2. 3. Kinematics vs. Dynamics Friction: A force is a push or a pull exerted on an object. This could result in starting, stopping, speeding up, slowing down, or changing direction. Newton’s Laws: A force depends on _________________ and _________________, therefore it is a __________________ quantity. often, there are several forces acting on a single object. The motion of the object is determined by the ____________ of all forces. 1. “A body continues in its state of rest or uniform motion unless an external unbalanced force acts on it.” 2. “ If an unbalanced force acts upon an object, then the object accelerates in the direction of the force and the acceleration so produced varies directly with the unbalanced force and inversely with the mass of the object.” Friction: is the extra force that is usually present when an object is moving ___ or ____________ something. If we can find out how large friction is, we can _____ it to the other forces. think about a book sliding on a desk. This type of friction is nearly constant. 3. “For every action there is an equal and opposite reaction force”

the study of how objects move, but not why they move. FORCE Kinematics vs. Dynamics the study of how objects move, but not why they move. A force is a push or a pull exerted on an object. This could result in starting, stopping, speeding up, slowing down, or changing direction. Newton’s Laws: A force depends on _________________ and _________________, therefore it is a __________________ quantity. often, there are several forces acting on a single object. The motion of the object is determined by the ____________ of all forces. 1. “A body continues in its state of rest or uniform motion unless an external unbalanced force acts on it.” 2. “ If an unbalanced force acts upon an object, then the object accelerates in the direction of the force and the acceleration so produced varies directly with the unbalanced force and inversely with the mass of the object.” Friction: is the extra force that is usually present when an object is moving ___ or ____________ something. If we can find out how large friction is, we can _____ it to the other forces. think about a book sliding on a desk. This type of friction is nearly constant. 3. “For every action there is an equal and opposite reaction force”

FORCE Newton’s Laws: 1. 2. 3. Kinematics vs. Dynamics Friction: the study of how objects move, but not why they move. the study of why an object moves the way that it does. A force is a push or a pull exerted on an object. This could result in starting, stopping, speeding up, slowing down, or changing direction. Newton’s Laws: A force depends on _________________ and _________________, therefore it is a __________________ quantity. often, there are several forces acting on a single object. The motion of the object is determined by the ____________ of all forces. 1. “A body continues in its state of rest or uniform motion unless an external unbalanced force acts on it.” 2. “ If an unbalanced force acts upon an object, then the object accelerates in the direction of the force and the acceleration so produced varies directly with the unbalanced force and inversely with the mass of the object.” Friction: is the extra force that is usually present when an object is moving ___ or ____________ something. If we can find out how large friction is, we can _____ it to the other forces. think about a book sliding on a desk. This type of friction is nearly constant. 3. “For every action there is an equal and opposite reaction force”

FORCE Newton’s Laws: 1. 2. 3. Kinematics vs. Dynamics Friction: the study of how objects move, but not why they move. the study of why an object moves the way that it does. A force is a push or a pull exerted on an object. This could result in starting, stopping, speeding up, slowing down, or changing direction. Newton’s Laws: A force depends on magnitude and direction, therefore it is a vector quantity. often, there are several forces acting on a single object. The motion of the object is determined by the net effect of all forces. 1. “A body continues in its state of rest or uniform motion unless an external unbalanced force acts on it.” 2. “ If an unbalanced force acts upon an object, then the object accelerates in the direction of the force and the acceleration so produced varies directly with the unbalanced force and inversely with the mass of the object.” Friction: is the extra force that is usually present when an object is moving ___ or ____________ something. If we can find out how large friction is, we can _____ it to the other forces. think about a book sliding on a desk. This type of friction is nearly constant. 3. “For every action there is an equal and opposite reaction force”

FORCE Newton’s Laws: 1. 2. 3. Kinematics vs. Dynamics Friction: the study of how objects move, but not why they move. the study of why an object moves the way that it does. A force is a push or a pull exerted on an object. This could result in starting, stopping, speeding up, slowing down, or changing direction. Newton’s Laws: A force depends on magnitude and direction, therefore it is a vector quantity. often, there are several forces acting on a single object. The motion of the object is determined by the net effect of all forces. 1. “A body continues in its state of rest or uniform motion unless an external unbalanced force acts on it.” 2. “ If an unbalanced force acts upon an object, then the object accelerates in the direction of the force and the acceleration so produced varies directly with the unbalanced force and inversely with the mass of the object.” Friction: is the extra force that is usually present when an object is moving on or through something. If we can find out how large friction is, we can add it to the other forces. think about a book sliding on a desk. This type of friction is nearly constant. 3. “For every action there is an equal and opposite reaction force”

FORCE Newton’s Laws: 1. 2. 3. Kinematics vs. Dynamics Friction: the study of how objects move, but not why they move. the study of why an object moves the way that it does. A force is a push or a pull exerted on an object. This could result in starting, stopping, speeding up, slowing down, or changing direction. Newton’s Laws: A force depends on magnitude and direction, therefore it is a vector quantity. often, there are several forces acting on a single object. The motion of the object is determined by the net effect of all forces. 1. “A body continues in its state of rest or uniform motion unless an external unbalanced force acts on it.” 2. “ If an unbalanced force acts upon an object, then the object accelerates in the direction of the force and the acceleration so produced varies directly with the unbalanced force and inversely with the mass of the object.” Friction: is the extra force that is usually present when an object is moving on or through something. If we can find out how large friction is, we can add it to the other forces. think about a book sliding on a desk. This type of friction is nearly constant. Does not depend on speed Does depend on the surface Does depend on the force pushing them together 3. “For every action there is an equal and opposite reaction force”

FORCE Newton’s Laws: 1. 2. 3. Kinematics vs. Dynamics Friction: the study of how objects move, but not why they move. the study of why an object moves the way that it does. A force is a push or a pull exerted on an object. This could result in starting, stopping, speeding up, slowing down, or changing direction. Newton’s Laws: A force depends on magnitude and direction, therefore it is a vector quantity. often, there are several forces acting on a single object. The motion of the object is determined by the net effect of all forces. 1. “A body continues in its state of rest or uniform motion unless an external unbalanced force acts on it.” Something sitting still will stay sitting still and something moving will stay moving unless a force acts on it. 2. “ If an unbalanced force acts upon an object, then the object accelerates in the direction of the force and the acceleration so produced varies directly with the unbalanced force and inversely with the mass of the object.” Friction: is the extra force that is usually present when an object is moving on or through something. If we can find out how large friction is, we can add it to the other forces. think about a book sliding on a desk. This type of friction is nearly constant. Does not depend on speed Does depend on the surface Does depend on the force pushing them together 3. “For every action there is an equal and opposite reaction force”

FORCE Newton’s Laws: 1. 2. 3. Kinematics vs. Dynamics Friction: the study of how objects move, but not why they move. the study of why an object moves the way that it does. A force is a push or a pull exerted on an object. This could result in starting, stopping, speeding up, slowing down, or changing direction. Newton’s Laws: A force depends on magnitude and direction, therefore it is a vector quantity. often, there are several forces acting on a single object. The motion of the object is determined by the net effect of all forces. 1. “A body continues in its state of rest or uniform motion unless an external unbalanced force acts on it.” Something sitting still will stay sitting still and something moving will stay moving unless a force acts on it. 2. “ If an unbalanced force acts upon an object, then the object accelerates in the direction of the force and the acceleration so produced varies directly with the unbalanced force and inversely with the mass of the object.” Friction: is the extra force that is usually present when an object is moving on or through something. If we can find out how large friction is, we can add it to the other forces. think about a book sliding on a desk. This type of friction is nearly constant. Does not depend on speed Does depend on the surface Does depend on the force pushing them together Force = mass x acceleration 3. “For every action there is an equal and opposite reaction force”

FORCE Newton’s Laws: 1. 2. 3. Kinematics vs. Dynamics Friction: the study of how objects move, but not why they move. the study of why an object moves the way that it does. A force is a push or a pull exerted on an object. This could result in starting, stopping, speeding up, slowing down, or changing direction. Newton’s Laws: A force depends on magnitude and direction, therefore it is a vector quantity. often, there are several forces acting on a single object. The motion of the object is determined by the net effect of all forces. 1. “A body continues in its state of rest or uniform motion unless an external unbalanced force acts on it.” Something sitting still will stay sitting still and something moving will stay moving unless a force acts on it. 2. “ If an unbalanced force acts upon an object, then the object accelerates in the direction of the force and the acceleration so produced varies directly with the unbalanced force and inversely with the mass of the object.” Friction: is the extra force that is usually present when an object is moving on or through something. If we can find out how large friction is, we can add it to the other forces. think about a book sliding on a desk. This type of friction is nearly constant. Does not depend on speed Does depend on the surface Does depend on the force pushing them together Force = mass x acceleration 3. “For every action there is an equal and opposite reaction force” Ex) If a hand pushes on a table, the table exerts an equal force on the hand.

FORCE Newton’s Laws: 1. 2. 3. Kinematics vs. Dynamics Friction: the study of how objects move, but not why they move. the study of why an object moves the way that it does. A force is a push or a pull exerted on an object. This could result in starting, stopping, speeding up, slowing down, or changing direction. NOTE: The acceleration due to gravity is 9.8m/s2. Newton’s Laws: A force depends on magnitude and direction, therefore it is a vector quantity. often, there are several forces acting on a single object. The motion of the object is determined by the net effect of all forces. 1. “A body continues in its state of rest or uniform motion unless an external unbalanced force acts on it.” Something sitting still will stay sitting still and something moving will stay moving unless a force acts on it. 2. “ If an unbalanced force acts upon an object, then the object accelerates in the direction of the force and the acceleration so produced varies directly with the unbalanced force and inversely with the mass of the object.” Friction: is the extra force that is usually present when an object is moving on or through something. If we can find out how large friction is, we can add it to the other forces. think about a book sliding on a desk. This type of friction is nearly constant. Does not depend on speed Does depend on the surface Does depend on the force pushing them together Force = mass x acceleration 3. “For every action there is an equal and opposite reaction force” Ex) If a hand pushes on a table, the table exerts an equal force on the hand.

Force Practice Problems

4. An object is being pushed with a force of 250 N [E] 4. An object is being pushed with a force of 250 N [E]. If the frictional force is 75 N, what is the net force?

F = m x a Practice Problems Units  F = m  a = (kg)(m/s2) = 1 Newton 1. A mass of 4.00 kg on a frictionless surface is given an acceleration of 3.8 m/s2 [W]. What force was given to the object?

2. A car has a mass of 2050 kg. When starting from rest, the motor can exert a force of 4.0  103N [S], which pushes the car forward. How quickly can the car accelerate?

3. A worker applies a force of 400 3. A worker applies a force of 400. N [E] on an object with a mass of 500g. If the frictional opposing force is 340. N, what is the resulting acceleration of the object?

3rd Law Practice: State the opposite forces for the following: 1) If a ball sits on a table: 2) A person pushing off a boat from shore: 3) When a package is tossed by someone:

Do a few qs from the assignment together