Tantheta = coeffient max of static friction. Inclined surfaces, be careful with vector, the angle at which the block/object will first begin to move is called the angle of repose. There are two kinds of friction: static (keeps surfaces stuck together = no movement) and kinetic (motion)įsmax= musForce normal, fk=mukforce normal
It can also be interpreted that for any given force, the greater the mass of an object, the smaller its acceleration.įorces that oppose sliding motion are termed friction. The greater the force exerted on an object, the greater the object's acceleration. Opposing forces (often friction) should be added/subtracted from the total to find the amount of fore that was really used in a situation Newton's second law of motion is net force = mass*acceleration. Predict for an angled shot, shot in a can provided by the TA, and an angled shot into a can. You may use your ruler and meter stick to measure any heights or lengths at the TA station In activity I you checked the value of the exit velocity of the ball at a lower height by firing horizontally off the lab table. Using the value of the velocity you found in Activity I, predict where the ball will land when fired from a spring gun at the TA station. Compare and contrast your results from steps 6 and 7 Using the time data from the photogate sensor to calculate the speed of the ball as it exits the barrelĨ. Using the vertical distance, and the total horizontal distance, x, calculate the time of flight (t) and the initial horizontal speed of the ballħ. Measure the horizontal distance along the floor from the release point to the spot on the paper where the ball hits.Ħ. Carefully remove the carbon paper and find the point on the floor that is directly beneath the release point on the barrel. Measure the vertical distance (height) from the bottom end of the barrel where the ball leaves the barrel to the floor.ĥ.
Then you will know exactly where it hits the groundģ. Fire one shot and see where the ball hits the floor. Put a plastic ball in the Projectile Launcher and use the ramrod to cock it to the medium position (see figure 3). Mount a Photogate to the exit end of the Launcher (Figure 2)Ģ. Activity I: Determining the Initial Horizontal Speed of the Ballġ.