Barry is conducting an experiment and rolls a tennis ball down a ramp. Which best describes the motion of the tennis ball? It do
es not exhibit projectile motion and follows a straight path down the ramp. It does not exhibit projectile motion and follows a parabolic path down the ramp. It exhibits projectile motion and follows a straight path down the ramp. It exhibits projectile motion and follows a parabolic path down the ramp.
It does not exhibit projectile motion and follows a straight path down the ramp.
Explanation:
Projectile motion is the motion of the object that is projected into air. The only force acting on it must be the earth's gravity. The object projected into air is called the projectile and its path is called the trajectory.
In our case Barry is not throwing the tennis ball into air. It is just moving along the surface. It is just like any other movement on a flat surface The only difference it is happening at an angle.
In our case there is friction acting on the tennis ball, but only earth's gravity is supposed to act on the tennis ball.
So it does not exhibit projectile motion and follows a straight line path down the ramp
From question (a) and (b) the pendulum motion is perpendicular to the force so the normal force will do no work and the tension in the string of the pendulum will not work
And so
c
An example will be a where a stone is attached to the end of a string and is made to move in a circular motion while keeping the other end of the string in a fixed position
d
A dog walking along a surface which has friction, here the frictional force would acting in the direction of the motion and this would do positive work
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