Kinetic energy is energy of motion. The kinetic energy of an object is the energy it possesses because of its motion.
100
What is the formula for force?
Force = mass * acceleration
100
What is a vector property and is velocity scalar or vector?
Velocity is vector- it is a property that is a straight line, and the direction matters.
100
What is the formula for speed?
speed = distance travelled / time it took
100
A car with a mass of 1800 kg accelerates from 5 m/sec to 12m/sec in 20 seconds. Using the formula for force, what is the force acting on this car?
F = m*a, so the answer is 12600 kg*m2/sec2
200
What is Potential Energy?
Potential energy is energy stored in an object. This energy has the potential to do work. Gravity gives potential energy to an object.
200
What are the MATHEMATICAL unit used for force?
1 kg*m2/ sec2
200
Name 3 simple tools
1. wheel and axle
2. wedge
3. pulley
4 inclined plane
5. screw
6. lever
200
What are the standard units used for speed?
meters per second, or m/s
200
If a car is going at a speed of 30 miles an hour, passes a car in 1 minute and is traveling at 60 miles an hour after passing the car, what is the car's acceleration in m/sec?
13.4 m/sec
300
What are the standard units used for Potential and Kinetic Energy?
A Joule (J)
300
What is kinetic friction?
Kinetic friction is friction applied to a moving object.
300
If a ball is struck by a pool cue and travels 1.3 meters in 0.5 seconds in a straight line, what is its velocity?
2.6 m/s
300
What is a scalar property, and is speed a scalar property?
Speed is scalar. It is represented as a single value or quantity. The direction travelled is not taken into account.
300
A car is rolling down a hill without pressing the gas pedal. What force is being applied to the car?
Gravity- the car is moving because of acceleration due to gravity, which is 9.8 m/s2.
400
A book weighing 0.65 kg is sitting on a bookshelf of 4.5 meters in the air. What is the potential energy of the book if it was to fall?
PE = m*g*h
m = mass (in kilograms)
g = gravitational acceleration of the earth (9.8 m/sec2)
h = height above earth's surface (in meters)
So, 28.67 Joules.
400
What is static friction?
The force that resists the beginning of sliding motion of one object over the other with which it is in contact.
400
What is the velocity (m/s) of a car that starts in Eastport and goes to Ellsworth? The distance is 78 miles by road and 38 miles in a straight line. It took 70 minutes to get to Ellsworth.
38 miles = 61155.1 m in 4200 secs, so the velocity is 14.56 m/s
400
Convert five miles to meters.
8046.72 meters (there are 1609.34 meters per miles)
400
If a car is moving at 55 mi/hour and the driver lets her foot off the gas WITHOUT applying the brake, why does the car keep moving?
Newtons first law: and object in motion tends to stay in motion except if there is an outside force. The car will probably slow down, though, due to friction.
500
What does Newton's Second Law of Motion State?
It states that if you do place a force on an object, it will accelerate in the direction of the force (change its velocity). Acceleration is dependent on the force acting on the object and its mass.
a = F/m
500
Does static friction or kinetic friction have a stronger force?
Static friction because the static friction force must be overcome by an applied force before an object can move.
500
What is the electromagnetic radiation? Name three types of waves.
The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. Radio waves, microwaves, infrared, UV rays, Visible rays name a few.
500
What is the distance travelled by a police car that moves at a constant speed of 1.5 km/minutes for 5.0 minutes?
distance= speed * time, so 7.5 km or 7500 m
500
Define inertia.
The tendency of an object to resist any change in its motion- an object at rest stays at rest, and object in motion stays in motion unless acting upon by an outside force.