What does the area under an acceleration-time graph represent?
Change in velocity
What is a scalar quantity?
A value that is described only by its magnitude and has no direction.
What is the acceleration of an object moving at constant velocity?
0 m s-2.
If you are given total velocity and an angle, how would you calculate the horizontal velocity?
vx=v0cosθ
A ball is dropped from a 100m high cliff. How fast will the ball be travelling the instant before hitting the ground?
44.7ms-1
What is the acceleration of the object at 6 seconds?
About 6.67ms-1
What is a vector quantity?
A value that is described by its magnitude and direction.
What is the vertical velocity (vy) of an object when it reaches its maximum height?
0ms-1
If you are given total velocity and an angle, how would you calculate the initial vertical velocity?
v0y=v0sinθ
A ball is kicked with an initial velocity of 15ms-1 at an angle of 45° to the horizontal. How long will the ball be in the air before it hits the ground?
About 2.12 seconds
Rank the objects in terms of their average speed from highest to lowest.
A, B, D, C
What is acceleration?
The rate of change in the velocity of an object over an interval of time.
What is the difference between distance and displacement?
Distance is a scalar quantity while displacement is a vector quantity. Also displacement is the length from the original position while distance is the total length
Can kinematics equations be used with multiple dimensions at the same time?
No, kinematics equations can only be applied to one dimension at a time.
A projectile is launched with an initial velocity of 20ms-1 at an angle of 30° above the horizontal. Calculate the maximum height reached by the projectile.
5m
What is the total distance traveled by the object?
24m
What is velocity?
The rate of change of displacement over an interval of time.
A ball is thrown horizontally off of a cliff while a rock is dropped. Which object has a greater velocity and why?
The ball will have a greater velocity because it will have both a horizontal and vertical velocity while the rock will only have a vertical velocity.
A car is moving at 7ms-1 and then starts to accelerate at a rate of 4ms-2 over 5 seconds. How fast is the car going after 5 seconds?
27ms-1
A ball is thrown horizontally from the top of a 45-meter high cliff with an initial speed of 10ms-1. How far from the base of the cliff will the ball land?
30m
What is the average acceleration of the object represented by this graph?
0ms-2
What is displacement?
The change in position of an object over an interval of time, measured along a straight line.
An object is launched vertically from the ground at an initial velocity v0. What is its velocity the instant before it lands on the ground?
-v0
A rock is thrown horizontally from the top of a cliff of height h at velocity v. Derive an equation for the horizontal distance traveled by the rock.
x=v√(2h/g)
Joe Biden is approximately 2 meters tall. Joe is playing baseball with his son Andrew. Joe throws the ball to Andrew, who is batting 20m away, and Andrew hits the ball with an exit velocity of 17ms-1 at an angle of 30° at a height of 0.5m. How far above Joe’s head will the ball fly?
0.82m (g= -10ms-2) or 1m (g= -9.81ms-2)