Units and Measurements
How many significant figures are in 0.3094?
four
A motorcycle can accelerate from rest to 20.5 m/s in 3 s. What is its average velocity?
6.8 m/s
What happens to the acceleration if the velocity is positive and the speed is decreasing?
Your mass on Earth is 40 kg. What will be your weight on Earth?
392 N
In this equation, KE = 1/2 mv2, What is the equation if we're going to get the volume?
v = √2 KE/m
What is the x and y component if it has a magnitude of 5 and at an angle of 30°?
x = 4.33; y = 2.5
What are the two measurements necessary for calculating speed?
distance and time
What happens when an object went upward?
It moves slower and slower.
You pushed the wall with 25 N of force. How much is the reaction force?
25
A boy pushes a parked car with a force of 85 N. The car does not move. How much work did the boy do?
0 J
It is a way of expressing numbers that are too big or too small to be conveniently written in decimal form or whole numbers.
Scientific Notation
What is the formula of acceleration?
a = v/t ; a = F/m
A car accelerates from 10 m/s to 55 m/s in 8 s. What is the truck’s acceleration
5.6 m/s2
What happens to the force of the object if the acceleration of an object increases?
The force increases.
What kind of energy is in a cube on top of the table?
Potential energy
It refers to the closeness of two or more measurements to each other.
precision
Mia runs 30 meters west to the park, then go back 10 meters to the east to buy snacks in the store. What is her displacement?
20 meters, west
A bicycle has an initial velocity of 30 m/s and then decelerates at 3 m/s2 for 5 s. What is its final velocity?
vf = 15 m/s
How much force is needed to accelerate a 20 kg suitcase at 5 m/s2?
100 N
How much time will be required to perform 450 J of work at a rate of 15 W?
30s