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SPH4C Findlay NEWTONS 2 ND LAW AND THE FORCE OF GRAVITY The student will be able to state Newtons Second Law and apply it in qualitative and quantitative terms to explain the effect of forces acting on objects.

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HOW WILL THE MARBLE ROLL WHEN IT LEAVES THE TRACK?

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1.Which object has the most inertia? a)A Feather b)A textbook c)Mr. Findlay d)An Elephant 2.Fuzzy dice are hanging from the rear-view mirror of a car that is travelling forward at constant speed. The dice are: a)Angled toward the back of the car b)Angled toward the front of the car c)Hanging straight down d)It cannot be determined Review: Newtons First Law

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3.Fuzzy dice are hanging from the rear-view mirror of a car that is travelling forward and speeding up. The dice are: a)Angled toward the back of the car b)Angled toward the front of the car c)Hanging straight down d)It cannot be determined 4.Fuzzy dice are hanging from the rear-view mirror of a car that is travelling forward and slowing down. The dice are: a)Angled toward the back of the car b)Angled toward the front of the car c)Hanging straight down d)It cannot be determined Review: Newtons First Law

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5.A block of weight 4.0 N is suspended from the ceiling by a piece of string. What is the magnitude of the tension in the string? a)4.0 N b)Less than 4.0 N c)Greater than 4.0 N d)Zero 6.A block of weight 4.0 N is being lifted at constant velocity by a piece of string. What is the magnitude of the tension in the string? a)4.0 N b)Less than 4.0 N c)Greater than 4.0 N d)zero REVIEW: NEWTONS FIRST LAW

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SPH4C Findlay NEWTONS 2 ND LAW OF MOTION AND WEIGHT

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Newtons Second Law of Motion

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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? Example 1.8 kN 1.6 kN

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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 a)the net force needed to cause that acceleration if the mass of the car is 1200 kg. Example Using Equations of Motion

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Weight (The Force of Gravity)

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Example

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1.Calculate the weight of the objects of given mass below. a)Oxygen gas molecule: 5.356 x 10 -26 kg 5.25 x 10 -25 N b)Penny: 0.00235 kg 0.023 N c)Tennis ball: 0.057 kg 0.56 N d)Student: 61 kg 598 N e)Newborn Elephant: 105 kg 1030 N Practice

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Section 2: Newton’s Laws. Newton’s 1 st law: Inertia: Demo: Hammer and Blocks Table Cloth: Balloon and Marbles:

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