Problems
9) A mechanic pushes a 2.50103kg car from rest to a speed of v, doing 5000J of work in the process. During this time, the car moves 25.0m. Neglecting friction between the car and road, find (a) v and (b) the horizontal force exerted on the car.

25) A daredevil on a motorcycle leaves the end of a ramp with a speed of 35.0 m/s as in the figure P5.25. If his speed is 33.0 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.

31) A horizontal spring attached to a wall has a force constant of 850 N/m. A block of mass 1.00 kg is attached to the spring and oscillates freely on a horizontal, frictionless surface as in Active Figure 5.20. The initial goal of this problem is to find the velocity at the equilibrium point after the block is released. (a) What objects constitute the system, and through what forces do they interact? (b) What are the two points of interest? (c ) Find the energy stored in the spring when the mass passes through the equilibrium and again when the mass passes through equilibrium after being released from rest. (d) Write the conservation of energy equation for this situation and solve it for the speed of the mass as it passes equilibrium?

35) a 0.250-kg block along a horizontal track has a speed of 1.50 m/s immediately before colliding with a light spring of force constant 4.60 N/m located at the end of the track. (a) What is the spring’s maximum compression if the track is frictionless? (b) If the track is not frictionless, would the spring’s maximum compression be greater that, less than or equal to the value obtained in part (a)?

36) A block of mass m=5.00kg is released form point a and slides on the frictionless track shown in figure p5.36. Determine (a) the bead’s speed at points b and c and (b) the net work done by the...

...Projectile motion is a form of motion where a particle (called a projectile) is thrown obliquely near the earth's surface, & it moves along a curved path under the action of gravity. The path followed by a projectile motion is called its trajectory. Projectile motion only occurs when there is one force applied at the beginning of the trajectory after which there is no interference apart from gravity.
The initial velocity
If the projectile is launched with an initial velocity v0, then it can be written as
\mathbf{v}_0 = v_{0x}\mathbf{i} + v_{0y}\mathbf{j}.
The components v0x and v0y can be found if the angle, ϴ is known:
v_{0x} = vgh_0\cos\theta,
v_{0y} = v_0\sin\theta.
If the projectile's range, launch angle, and drop height are known, launch velocity can be found by
V_0 = \sqrt{{R^2 g} \over {R \sin 2\theta + 2h \cos^2\theta}} .
The launch angle is usually expressed by the symbol theta, but often the symbol alpha is used.
Kinematic quantities of projectile motion
In projectile motion, the horizontal motion and the vertical motion are independent of each other; that is, neither motion affects the other.
Acceleration
Since there is no acceleration in the horizontal direction velocity in horizontal direction is constant which is equal to ucosα. The vertical motion of the projectile is the motion of a particle during its free fall. Here the acceleration is constant, equal to g.[1] The components of the...

...one twice the mass of the other, experience the same force for the same time. What is their difference in momentum? What is their difference in kinetic energy?
2. A 12 g bullet is fired horizontally into a 96 g wooden block initially at rest on a horizontal surface. After impact, the block slides 7.5 m before coming to rest. If the coefficient of kinetic friction between block and surface is 0.60, what was the speed of the bullet immediately before impact?
3. A ball bounces upward from the ground with a speed of 14 m/s and hits a wall with a speed of 12 m/s. How high above the ground does the ball hit the wall? Ignore air resistance.
4. A 200 g mass is attached to a spring of spring constant k. The spring is compressed 15 cm from its equilibrium value. When released the mass reaches a speed of 5 m/s. What is the spring constant (in N/m)?
5. A 34-g bullet traveling at 120m/s embeds itself in a wooden block on a smooth surface. The block then slides toward a spring and collides with it. The block compresses the spring (k=100 N/m) a maximum of 1.25 cm. Calculate the mass of the block of wood.
6. If a force of 300N is exerted upon a 60 kg mass for 3 seconds, how much impulse does the mass experience?
7. An 80-kg man and his car are suddenly accelerated from rest to a speed of 5 m/s as a result of a rear-end collision. Assuming the time taken to be 0.3s, find:
a) the impulse on the man and
b) the average...

...The MaximumHeight of the bounce of a ping pong ball
Introduction
This experiment,is an investigation into the maximumheight of the bounce of a ping pong ball when it is first released.This is because of the unpredictability of the bounce not always reaching the same height.This we can assume their are many factors effecting the bounce of the ping pong ball.The following experiment will determine how different surfaces on which a ping pong ball is released affects the height of the first bounce.
Research question
How does the surface on which a ping pong ball bounces affect its maximumheight of first bounce, provided other factors are kept constant?
Factors which affect the height of the first bounce
The gravitational potential energy & kinetic energy of the ping pong ball.
The surface on which it bounces.
The initial height of release.
The dimensions of the surface on which it bounces.
The angle of projection.
The speed of projection.
The Temperature of the ball.
The pressure within the ball.
The Room conditions of which each surface is placed (Room temperature ,wind speed etc..)
The force at which the ball is released.
The acceleration due to gravity.
The density of the the atmosphere within that area.
The type,size,weight,mass,density and volume of the ping pong ball.
Variables
Independent...

...What is Force?
In physics, a force is any influence that causes an object to undergo a certain change, either concerning its movement, direction, or geometrical construction. It is measured with the SI unit of newtons and represented by the symbol F. In other words, a force is that which can cause an object with mass to change its velocity(which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. Force can also be described by intuitive concepts such as a push or pull. A force has both magnitude and direction, making it a vector quantity.
The original form of Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time.[1] If the mass of the object is constant, this law implies that the acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional the mass of the object. As a formula, this is expressed as:
where the arrows imply a vector quantity possessing both magnitude and direction.
Related concepts to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque which produces changes in rotational speed of an object....

...com.au mail@keepitsimplescience.com.au
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Years 7-8
FORCES
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Year 7-8 General Science
Disk Filename 01.Energy 02.Forces 03.Matter 04.Mixtures 05.Elements 06.Cells 07.Life 08.LifeSystems 09.Astronomy 10.Earth 11.Ecosystems Topic Name Energy Forces Solids, Liquids & Gases Separating Mixtures...

...Forces
Have you ever wondered how forces link to our life? Everything we’ve learned in science has got me thinking about it.
Forces are an essential part of our daily lives. Forces act on all objects. And we need force for everything we do, whether it’s a push, pull or twist. Force gives an object the energy to move, stop moving or change direction. Newton’s first law states that an objects velocity cannot change unless it is acted upon by a force. Here are examples of force in everyday life.
A mother pushing a baby stroller would be an example of a push.
This diagram shows two teams of players while they are pulling the rope in a game of tug-of-war.
Here is one we learned in class:
The up thrust of the water and the weight of the boat ,help the it float.
Though there are many different types of forces but I have chosen to talk to you about friction. Friction is the force between two objects in contact with each other, making it a contact force. It causes moving objects to slow down. Air resistance is a type of friction.
Friction is an important force in our lives. We rely on friction in many ways. An athlete usually wears shoes which provide him/her with a greater friction between the shoe and the surface. We rely on friction as an important aspect of...

...the gliders to glide down the slope. A blower pump is placed under the table, and it is connected to the beam, which allows air to blow out from the holes to reduce the friction of a moving object on top of it. At the end of the Air Track there is a Motion Sensor to record the position, velocity, and acceleration of the moving object. There are also two different sized wooden block and two gliders. One of the gliders is gold and the other is red. A meter stick is also provided to record height and length of the given objects.
Theory:
Velocity is the derivative of a position graph, and acceleration is the derivative of a velocity graph. When the expression a = dv/dt = d2x/dt2 is integrated twice with acceleration held constant, it yields two integrations:
x = x0+v0t+1/2at2
v = v9+at
These two expressions show the relationship between position, velocity, and acceleration at a given time.
Newton’s 2nd law states that the acceleration of an object depends on the net force acting upon the object and the mass of the object. If there were no friction in this experiment, then the acceleration of the glider would be equal to acceleration of gravity multiplied by the angle between the air track and the horizontal table (g x sin θ).
Procedure:
(3.1) The air track was leveled by placing a glider on the track and adjusting the knob at the end of the air track until the glider did not move. A motion sensor is placed at the end...

...SPH4U: Forces – Context Rich Problems
I do not have answers to these problems, and I haven’t thought about how to solve them. They are all fairly challenging and fair game for a test question. Work with friends on them, explain your solutions and convince yourselves that you understand the problems. I can’t tell you if you are right - I just don’t know!
1. Tension, Weight, Friction: You are taking advantage of an early snow to go sledding. After a long afternoon of going up and down hills with your sled, you decide it is time to go home. You are thankful that you can pull your sled without climbing any more hills. As you are walking home, dragging the sled behind you by a rope fastened to the front of the sled, you wonder what the coefficient of friction of the snow on the sled is. You estimate that you are pulling on the rope with a 2 pound force, that the sled weighs 10 pounds, and that the rope makes an angle of 25 degrees to the level ground
2. Tension, Weight: You are part of a team to help design the atrium of a new building. Your boss, the manager of the project, wants to suspend a 20-lb sculpture high over the room by hanging it from the ceiling using thin, clear fishing line (string) so that it will be difficult to see how the sculpture is held up. The only place to fasten the fishing line is to a wooden beam which runs around the edge of the room at the ceiling. The fishing line that she wants to use will hold 20 lbs....

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