High School Physics : High School Physics
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Example Questions
Example Question #161 : High School Physics
An object starts at rest, and then accelerates at a rate of 
The formula relating velocity and acceleration is:
We are given values for the acceleration and time. We can also conclude that the initial velocity is zero. Using these values, we can solve for the final velocity.
Example Question #161 : High School Physics
A cannonball is fired horizontally from the wall of a castle 25m high with a speed of 
To solve this problem manipulate the motion equation 
Example Question #161 : High School Physics
Peter starts from rest and runs down a hallway in 31 seconds. If his final velocity is 
We can solve this question using the given initial velocity, final velocity, and time.
Example Question #162 : High School Physics
Leslie rolls a ball out of a window from 10 meters above the ground, such that the initial y-velocity is zero. How long will it be before the ball hits the ground?
We are given the initial velocity, acceleration, and distance traveled. Using the equation below, we can solve for the time.
The distance is negative, which makes since because the ball is traveling downward.
Example Question #163 : High School Physics
Derek rolls a ball along a flat surface with an initial velocity of 
We can solve this question by multiplying the average velocity by the time.
We are given the initial and final velocities and the time travelled.
Example Question #164 : High School Physics
Peter starts from rest and runs down a hallway 31 seconds. If his final velocity is 
Using the given values for the initial velocity, final velocity, and time, we can solve for the distance. The distance will be the product of the average velocity and the time.
Example Question #96 : Motion And Mechanics
Walter throws a disc from 1.5 meters above the ground with purely horizontal motion. If he throws it with an initial velocity of 
The horizontal velocity will determine how far the disc travels; gravity and vertical velocity will not affect the horizontal distance. We can solve by using the distance formula.
Example Question #97 : Motion And Mechanics
Julia throws a 
If she were throwing a 
It will travel 
It will travel 
It will travel the same distance
It will travel twice as far
It will travel half as far
It will travel the same distance
The equation for horizontal distance travelled during parabolic (projectile) motion is:
The distance is related to the velocity and the flight time only. The mass of the projectile will not affect any of these variables, and therefore will not affect the distance travelled.
We can also analyze this formula in terms of the units and dimensional analysis.
There is no units for mass or 
A change in the mass will not change the distance travelled; the projectile will travel the same distance.
Example Question #101 : Linear Motion
A 
The best formula for this will be 
We are given the initial velocity (zero because the box starts at rest), final velocity, and distance. Using these values, we can solve for the acceleration. We are also given the mass, but this is extraneous information.
Divide both sides by 
Example Question #102 : Linear Motion
A crate slides across a floor. After 
Acceleration is the change in velocity over the change in time:
In this case, even though we look at the crate after different times, the velocity hasn't changed at all.
If there is no change in the velocity, then the acceleration must be equal to zero.
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