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Practice test chapter 1~ Physics
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Gravity
Terms in this set (34)
what term means the change in position of an object
displacement
what term refers to the total length of the path travelled by an object in motion?
distance
what is the displacement if you walk 250m [E] and then 100m [W] ?
150m [E]
What is a vector?
a quantity that has both magnitude and direction
what is a line drawn to a specific scale with and arrow head called?
directed line segment
what is the expression for average velocity?
-> ->
v= △d/△t
what term refers to the change between points on the y-axis
rise
Which of the following objects most accurately demonstrates an object moving with uniform velocity?
a) a merry-go-round
b) a runner racing from start to finish
c) a tennis ball during a match
d) a car travelling on the highway with cruise control on
d) a car travelling on the highway with cruise control on
If a car starts from rest and speeds up to 10.0 m/s in 4.0s. What is the acceleration of the car?
2.5 m/s²
(true of false) Motion is the line an object moves along from a particular started point.
False
(true of false) A scalar is a quantity that has a magnitude and also direction
False
(true of false) Kinematics is the term used by physicists and engineers to describe the study of how objects move.
True
(true of false) Vectors are added by joining them tip to tip
False
(true of false) The difference between speed and velocity is that speed is a vector while velocity is a scalar.
False
(true of false) The slope of a position-time graph gives the velocity of the object.
True
(true of false) Motion in a straight line but with a varying speed is considered motion with uniform velocity.
False
(true of false) The slope of a velocity- time graph gives the displacement of an object.
False
(true of false) Acceleration is measured in the meters per second, per second
True
match each term with the description
a) Distance i) a quantity that has a magnitude only
b) Scalar ii) motion at a constant speed in a straight line
c) Acceleration iii) the acceleration of an object in free fall
d) Uniform velocity iv) the steepness of a line or rise/run
e) Acceleration due v) the total length of the path travelled
to gravity by an object
f) Slope vi) the rate of change of velocity
a) distance -> v)the total length of the path travelled by an object
b) Scalar -> i) a quantity that has a magnitude only
c) Acceleration -> vi) the rate of change of velocity
d) Uniform velocity -> ii) motion at a constant speed in a straight line
e) Acceleration due to gravity -> iii) the acceleration of an object in free fall
f) Slope -> iv) the steepness of a line or rise/run
In your own words describe the difference between velocity and speed and how they relate to distance and displacement.
velocity is the total displacement over total time, with a cardinal direction included.
speed is the total distance over total time without a direction.
A car changes its position from 76km [W] to 54km [E]. What is the cars displacement ?
delta D = delta D final + delta D initial
54 + 76 = 130km [E]
A race car travels a distance of 250m in 4.0s. What is the average speed of the car?
speed = distance/time
speed = 250/4.0
v = 63 m/s
A person throws a basketball with an average speed of 15 m/s. How far will the ball go in 3.0s?
speed = distance/time
15 = d/3.0
d = 45m
A bird flies 310m [S] of its nest in 8.0s. What is the velocity of the bird?
Velocity = delta displacement/delta time
velocity = 310/8.0
v = 38.75 -> 39m/s [S]
A bird flies from its nest and lands in a tree that is 2400m due west. If the bird can fly at an average velocity of 9.0 m/s for how long, in seconds is the bird in flight?
Velocity = delta displacement/delta time
9.0 = 2400/t --> 9.0/2400
t = 266 -> 270s
A runner starts a race and in 1.25s has a velocity of 5.0 m/s [E]. Determine the acceleration of the runner.
Acceleration = delta velocity/ delta time
acceleration = 5.0/ 1.25
A = 4.0 m/s² [E]
A horse starts running and accelerates at a rate of 6.25 m/s² [W] for 2.0s. What is the final velocity of the horse?
Acceleration = delta velocity/ delta time
6.25 = delta v/ 2.0 --> 6.25x2.0
delta v = 12.5 -> 13 m/s [W]
What term is used to describe the vector that is generated when adding two vectors?
resultant vector
What vector is equivalent to N 40° W?
W 50° N
For a diagram scale of 1cm : 10m, what is the real-world measurement of a 2.5cm diagram measurement?
25cm
(true or false) A diagram with a scale of 1cm : 10cm means that 10cm on the diagram represents 1cm in real life.
false
(true or false) To find the direction of the vector 5m [E 30° S], point east and then turn 30° to the south.
true
(true or false) To add two vectors on a diagram, join them tip to tip.
false
Express each of the following vectors differently by using an equivalent direction:
A) delta D = 566m [W 18° N]
B) delta D = 37cm [E 68° S]
C) delta D = 7150km [S 38° W]
A) delta D = 566m [W 72° N]
B) delta D = 37cm [S 22° E]
C) delta D = 7150km [W 52° S]
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