Newton’s 1st Law: More Practice

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Presentation transcript:

Newton’s 1st Law: More Practice

Newton’s 1st Law: More Practice

Newton’s 1st Law: More Practice

Newton’s 1st Law: More Practice

Newton’s 1st Law: More Practice

Newton’s 1st Law: More Practice

Newton’s 1st Law: More Practice

Newton’s 1st Law: More Practice

Newton’s 1st Law: More Practice

Newton’s 2nd Law of Motion: Student Learning Goal The student will be able to state Newton’s 2nd Law and apply it in qualitative and quantitative terms to explain the effect of forces acting on objects. (B3.4)

Newton’s 2nd Law of Motion

Newton’s Second Law of Motion If the net force is not zero, the object will be accelerated in the direction of the net force.

Newton’s Second Law of Motion If the net force is not zero, the object will be accelerated in the direction of the net force.

Newton’s Second Law of Motion If the net force is not zero, the object will be accelerated in the direction of the net force. i.e. the more massive the object, the harder it is to change its motion (the higher its inertia).

Newton’s Second Law of Motion If the net force is not zero, the object will be accelerated in the direction of the net force.

Newton’s Second Law Example Example: A weightlifter lifts a 165-kg weight by exerting a force of 1.8 kN [up]. The force of gravity on the object is 1.6 kN [down]. Draw a FBD of the weight. What is the net force on the weight? What is the acceleration of the weight?

Newton’s Second Law Example FA = 1.8 kN Fg = 1.6 kN

Newton’s Second Law Example The net force is 0.2 kN [up]. FA = 1.8 kN Fg = 1.6 kN

Newton’s Second Law Example What is the acceleration of the weight?

Newton’s Second Law Example What is the acceleration of the weight?

Newton’s Second Law Example What is the acceleration of the weight?

Newton’s Second Law Example What is the acceleration of the weight?

Newton’s Second Law Example What is the acceleration of the weight?

Newton’s Second Law Example What is the acceleration of the weight? [up]

Example with the Equations of Motion A car is travelling at 25 m/s [forward] when the driver slams on the brakes and stops the car in 3.0 s. Calculate (a) the acceleration of the car and (b) the net force needed to cause that acceleration if the mass of the car is 1200 kg.

Example with the Equations of Motion A car is travelling at 25 m/s [forwards] when the driver slams on the brakes and stops the car in 3.0 s. Calculate (a) the acceleration of the car.

Example with the Equations of Motion A car is travelling at 25 m/s [forwards] when the driver slams on the brakes and stops the car in 3.0 s. Calculate (a) the acceleration of the car.

Example with the Equations of Motion A car is travelling at 25 m/s [forwards] when the driver slams on the brakes and stops the car in 3.0 s. Calculate (a) the acceleration of the car.

Example with the Equations of Motion A car is travelling at 25 m/s [forwards] when the driver slams on the brakes and stops the car in 3.0 s. Calculate (a) the acceleration of the car.

Example with the Equations of Motion A car is travelling at 25 m/s [forwards] when the driver slams on the brakes and stops the car in 3.0 s. Calculate (a) the acceleration of the car. or 8.3 m/s2 [backward]

Example with the Equations of Motion Calculate (b) the net force needed to cause that acceleration if the mass of the car is 1200 kg.

Example with the Equations of Motion Calculate (b) the net force needed to cause that acceleration if the mass of the car is 1200 kg. or 10 000 N [backward]

Weight The formula F = ma can also be used to calculate the weight Fg of an object

Weight The formula F = ma can also be used to calculate the weight Fg of an object, the magnitude of the force of gravity acting on it

Weight The formula F = ma can also be used to calculate the weight Fg of an object, the magnitude of the force of gravity acting on it, if the acceleration a is . . .

Weight The formula F = ma can also be used to calculate the weight Fg of an object, the magnitude of the force of gravity acting on it, if the acceleration a is the acceleration due to gravity, g = 9.8 m/s2.

Weight The formula F = ma can also be used to calculate the weight Fg of an object, the magnitude of the force of gravity acting on it, if the acceleration a is the acceleration due to gravity, g = 9.8 m/s2. (mass is measured in kg)

Weight Weight is therefore measured in Newtons. And the direction of the force is always [down].

Weight: Example What is the weight of a 140 kg person?

Weight: Example What is the weight of a 140 kg person?

Weight: Example What is the weight of a 140 kg person?

More Practice Tomorrow: Newton’s 2nd Law of Motion Lab