Random
Speed and Velocity
Graphing Motion
Forces
GPE and KE
100
An object in motion will remain in motion unless ....
acted upon by a force.
100
What is the formula for calculating speed?
distance divided by time.
100
What type of motion does this graph show?
constant speed
100
For an object to move an unbalanced __________ must be applied.
Force
100
GPE stands for ....
Gravitational Potential Energy
200
If you have a net force of 0 N, the forces are __________?
Balanced
200
If speed and distance are known, how is time calculated?
distance divided by speed.
200
Which graph shows constant speed?
G
200
What is the net force and what direction will the box move?
2 N to the right
200
What happens to the GPE possessed by a raised object as it falls?
It is transformed into Kinetic energy
300
What is inertia?
The resistance of an object to change its state of motion
300
Suppose a cyclist travels 30 Km in 2 hours. What is the cyclist speed?
15 km/h
300
Which runner stopped for a break?
C
300
What type of force is the resistant force on a car's wheels?
Friction
300
A rock at the top of a cliff has a mass of 20 kg. The cliff is 10 m high. How much GPE does it have?
GPE = m x g x h
= 20 x 9.8 x 10
= 1960 Joules
400
Which of Newton's laws is also known as the Law of Inertia?
First
400
A word that means the speed and direction of an object's motion.
Velocity
400
How are segments B-C and D-E different?
In segment B-C, they are traveling at a constant speed and during segment D-E, they are stopped.
400
If student A pushes a box with 200N of force, against a 50 N headwind, how much force will he have to apply to overcome the effects of the headwind ?
250 N
400
A car is travelling through town, with a mass of 1040kg and kinetic energy of 49000J. Calculate the velocity it is travelling at.
KE = 1/2mass x V2 V2 = KE / 1/2mass
= 49000 / 520
V2 = 94.2
V = sq root of 94.2
= 9.7 m/s
500
What is the difference between speed and velocity?
Velocity has direction
500
What was the car's average speed for the entire trip?
60 km / 5 hours = 12 km/h
500
What is this graph showing?
deceleration, negative acceleration, or slowing down.
500
A crumple zone on the front of a car absorbs the impact of the forces from a head-on collision instead of it affecting the passengers or driver. Which of Newton's laws does this apply to?
Third - for every action there is an equal and opposite reaction.
500
Calculate the Kinetic energy of a 80kg diver when he has jumped off the 10m tower, and is half way down.
GPE = m x g x h
= 80 x 9.8 x 10
= 7840 J
Half way down, half has been converted to kinetic energy. 7840 divided by 2 = 3920 so he has 3920J of kinetic energy.