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What type of forces are observed in the diagram?

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What type of forces are observed in the diagram? Balanced forces Determine the net force placed on the piano. 25N + 20N = 45N 3. Which way will the piano move? – PowerPoint PPT presentation

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Title: What type of forces are observed in the diagram?


1
  • What type of forces are observed in the diagram?
  • Balanced forces
  • Determine the net force placed on the piano.
  • 25N 20N 45N
  • 3. Which way will the piano move?
  • To the right.

2
  • What type of forces are observed in the diagram?
  • Unbalanced forces
  • Determine the net force placed on the piano.
  • 12N - 10N 2N
  • 3. Which way will the piano move?
  • To the right.

3
  • Describe friction.
  • Force that acts opposite to the motion of a
    moving object.
  • What type of surface can increase friction?
  • Ice
  • What type of surface can increase friction?
  • Sticky surface

4
  • Topic Forces and Motion
  • Aim Describe Newtons 3 Laws of Motion.
  • Do Now
  • HW

5
  • A student is riding a bike and applies the
    brakes. What most helps the bike to stop?
  • Friction
  • Heat
  • Gravity
  • Momentum

6
  • 2 people are pulling at opposite ends of a rope.
    If they are pulling on the rope with equal but
    opposite forces, what will happen to the rope?
  • It will stay in place between the 2 people.
  • It will move towards the right.
  • It will move towards the left.
  • It will fall to the ground.

7
  • 2 people are pulling at opposite ends of a rope.
    The person pulling on the right side of the rope
    is applying a force of 50N while the person on
    the left is applying a force of 70N. What will
    happen to the rope?
  • It will move towards the right.
  • It will move towards the left.
  • It will fall to the ground.
  • It will stay in place.

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9
  • When workers spread sand over icy bridges and
    roads in the winter, how does this help people
    drive on the roads?
  • The sand increases friction between the road and
    tires of the car.
  • The sand increases inertia of the car.
  • The sand increases the speed of the car.
  • The sand increases the momentum of the car.

10
  • Determine the total net force being placed on the
    rope.
  • 320N 300N 20N
  • Which way will the rope be pulled? Support your
    answer.
  • The rope will be pulled to the left.
  • It moves in the direction of the greater
    force.

11
  • The diagram shows the amount of force required to
    keep the same block of wood moving across the
    table top.
  • Explain why the round pencils in diagram 2
    decreases the amount of force needed to move the
    block of wood.
  • The round pencil decreased the amount of
    friction.

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16
  • 1. Explain why you feel pulled back when the car
    is starting and pushed forward when the car
    stops?
  • Inertia causes the object to resist a
    change in motion.
  • 2. Which one of Newtons laws does this
    demonstrate?
  • Newtons 1st law.

17
  • A 60kg water skier is being pulled by a
    speedboat. The force causes him to accelerate at
    2 m/s2. Calculate the force that causes this
    acceleration.
  • F ma
  • F 60kg x 2 m/s2
  • F 120.0 N

18
  • A driver steps on the gas and the car gradually
    accelerates to 50km/h. The driver then slams on
    the brakes to avoid hitting a box on the road. As
    the car comes to a stop, the drivers body
    appears to lurch forward in the seat until
    restrained by the seat belt.
  • Which law best explains why the drivers body
    lurches forward when brakes are suddenly applied?
  • Newtons 1st Law
  • Newtons 2nd Law
  • Newtons 3rd Law
  • The law of gravity

19
  • The tendency of a stationary object to resist
    being put into motion is known as
  • acceleration
  • gravity
  • inertia
  • velocity

20
  • Which of the following wagons should move faster
    if pushed with the same force?
  • A wagon containing a boy with a mass of 24kg
  • A wagon containing a small bird with a mass of
    10kg
  • A wagon containing a big dog with a mass of 45kg
  • A wagon containing an elephant with a mass of
    60kg

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23
  • 1. A chair exerts a force of 20N on the floor.
    What is the force that the floor exerts on the
    chair?
  • 10N
  • 20N
  • 21N
  • 40N
  • 2. Which one of Newtons Law is taking place in
    the question above?
  • Newtons 3rd law

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26
  • Describe gravity.
  • It is the force of attraction between
    all objects in the universe
  • 2. Explain the relationship between gravity and
    mass.
  • As mass increases, gravity increase.
  • 3. Explain the relationship between gravity and
    distance between 2 objects.
  • As the distance between 2 objects
    increases, gravity decreases.

27
  • Explain the difference between weight and mass.
  • Weight is the force of measure of the force
    of gravity on an object.
  • Mass is the amount of matter in an object.
  • 2. State the acceleration due to gravity on
    Earth.
  • ag 9.8 m/s2
  • 3. State the equation used to determine an
    objects weight on earth.
  • W mass x ag

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29
  • 1. The moon has a smaller mass than the earth. If
    you were able to travel to the moon, your weight
    would
  • increase
  • decrease
  • remain the same
  • vary from day to night
  • 2. What would happen to your mass?
  • The mass would not change.

30
  • The force of gravity on an object depends
    primarily on the objects
  • density
  • momentum
  • mass
  • volume

31
  • The distance of the star Vega from Earth is 1.6
    million times greater than the distance from the
    sun to the Earth. Which of the following best
    describes the gravitational influence of Vega on
    Earth?
  • It is roughly equal to that of the sun.
  • Its influence is greater than that of the sun.
  • Its influence is small because of its distance.
  • It influences the magnitude of Earths mass.

32
  • If a solid object is taken from Earth far into
    space, which of the following measurements of the
    object will change the most?
  • density
  • mass
  • volume
  • weight

33
  • If you were able to go to the top of a building
    and simultaneously drop an apple and a basketball
    , they would hit the ground at the same instant
    because
  • the force of gravity on them is equal
  • they have the same mass
  • air resistance on both is the same
  • they have the same amount of kinetic energy

34
  • As a bike rider goes up a hill, the force of
    gravity acts to
  • increase the weight of the rider
  • increase the acceleration of the rider
  • decrease the weight of the rider
  • decrease the speed of the rider

35
  • How would the measureable properties of a golf
    ball change if it were moved from the earth to
    the moon?
  • It would have the same weight but different mass.
  • It would have the same mass but different weight.
  • It would have the same density but different
    mass.
  • It would have the same mass but different
    density.

36
  • Which of the following cause a ships iron anchor
    to sink to the ocean floor when released
    overboard?
  • Nuclear forces
  • Magnetism
  • Gravity
  • Chemical forces

37
  • Which of the following statements best describes
    the force of Earths gravity on a rocket moving
    upwards?
  • The gravitational force is constant at all
    altitudes.
  • The gravitational force is weaker when the rocket
    is higher.
  • The gravitational force is stronger when the
    rocket is higher.
  • The gravitational force is zero when the altitude
    is greater than 10, 000 miles.

38
  • Describe magnetism.
  • Force of attraction or repulsion.
  • 2. Identify materials attracted to magnets.
  • Iron, nickel, cobalt, steel

39
  • Describe the magnetism occurring in the diagram.
  • Opposite poles are attracted to each other.

40
  • Describe the magnetism occurring in the diagram.
  • Alike poles repel each other.

41
  • 1. Describe a magnetic field.
  • An area around magnet where magnetic forces act.
  • 2. Where is magnetic field the strongest?
  • It is strongest at poles
  • 3. What occurs to the magnetic field as the
    distance from the magnet increases?
  • The magnetic field decreases.

42
  • What is the direction of a magnetic field?
  • It moves from north to south.

43
  • Describe what is occurring in the diagram.
  • Poles that are alike repel each other.

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