Transcript TOPIC: AIM: How is force related to motion? DO NOW: How do you

1. What type of forces are observed in the
diagram?
Balanced forces
2. Determine the net force placed on the piano.
25N + 20N = 45N
3. Which way will the piano move?
To the right.
1. What type of forces are observed in the
diagram?
Unbalanced forces
2. Determine the net force placed on the piano.
12N - 10N = 2N
3. Which way will the piano move?
To the right.
1. Describe friction.
Force that acts opposite to the
motion of a moving object.
2. What type of surface can increase friction?
Ice
3. What type of surface can increase friction?
Sticky surface
Topic: Forces and Motion
Aim: Describe Newton’s 3 Laws of Motion.
Do Now:
HW:
A student is riding a bike and
applies the brakes. What most
helps the bike to stop?
1.Friction
2.Heat
3.Gravity
4.Momentum
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?
1.It will stay in place between the 2
people.
2.It will move towards the right.
3.It will move towards the left.
4.It will fall to the ground.
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?
1.It will move towards the right.
2.It will move towards the left.
3.It will fall to the ground.
4.It will stay in place.
When workers spread sand over icy bridges
and roads in the winter, how does this help
people drive on the roads?
1. The sand increases friction between the
road and tires of the car.
2. The sand increases inertia of the car.
3. The sand increases the speed of the car.
4. The sand increases the momentum of the
car.
1. Determine the total net force being placed on the
rope.
320N – 300N = 20N
1. 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.
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.
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 Newton’s laws does this
demonstrate?
Newton’s 1st law.
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
– F = 120.0 N
2 m/s2
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 driver’s body appears to lurch
forward in the seat until restrained by the seat belt.
Which law best explains why the driver’s body
lurches forward when brakes are suddenly applied?
1.Newton’s 1st Law
2.Newton’s 2nd Law
3.Newton’s 3rd Law
4.The law of gravity
The tendency of a stationary object
to resist being put into motion is
known as
1.acceleration
2.gravity
3.inertia
4.velocity
Which of the following wagons should move
faster if pushed with the same force?
1.A wagon containing a boy with a mass of
24kg
2.A wagon containing a small bird with a
mass of 10kg
3.A wagon containing a big dog with a mass
of 45kg
4.A wagon containing an elephant with a
mass of 60kg
1. A chair exerts a force of 20N on the floor.
What is the force that the floor exerts on the
chair?
1. 10N
2. 20N
3. 21N
4. 40N
2. Which one of Newton’s Law is taking
place in the question above?
Newton’s 3rd law
1. 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.
1. 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 object’s
weight on earth.
W = mass x ag
1. The moon has a smaller mass than the
earth. If you were able to travel to the moon,
your weight would
1. increase
2. decrease
3. remain the same
4. vary from day to night
2. What would happen to your mass?
The mass would not change.
The force of gravity on an object
depends primarily on the object’s
1.density
2.momentum
3.mass
4.volume
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?
1.It is roughly equal to that of the sun.
2.Its influence is greater than that of the
sun.
3.Its influence is small because of its
distance.
4.It influences the magnitude of Earth’s
mass.
If a solid object is taken from Earth
far into space, which of the
following measurements of the
object will change the most?
1.density
2.mass
3.volume
4.weight
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
1. the force of gravity on them is equal
2. they have the same mass
3. air resistance on both is the same
4. they have the same amount of kinetic
energy
As a bike rider goes up a hill, the force
of gravity acts to
1.increase the weight of the rider
2.increase the acceleration of the rider
3.decrease the weight of the rider
4.decrease the speed of the rider
How would the measureable properties of
a golf ball change if it were moved from
the earth to the moon?
1.It would have the same weight but
different mass.
2.It would have the same mass but
different weight.
3.It would have the same density but
different mass.
4.It would have the same mass but
different density.
Which of the following cause a ship’s
iron anchor to sink to the ocean floor
when released overboard?
1.Nuclear forces
2.Magnetism
3.Gravity
4.Chemical forces
Which of the following statements best
describes the force of Earth’s gravity on a
rocket moving upwards?
1.The gravitational force is constant at all
altitudes.
2.The gravitational force is weaker when
the rocket is higher.
3.The gravitational force is stronger when
the rocket is higher.
4.The gravitational force is zero when the
altitude is greater than 10, 000 miles.
1.Describe magnetism.
Force of attraction or
repulsion.
2. Identify materials attracted to
magnets.
Iron, nickel, cobalt, steel
Describe the magnetism occurring in the
diagram.
Opposite poles are attracted to
each other.
Describe the magnetism occurring in the
diagram.
Alike poles repel each other.
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.
What is the direction of a magnetic
field?
It moves from north to south.
Describe what is occurring in the diagram.
Poles that are alike repel each other.
S
N
N