Speed, Acceleration, and Velocity
_________ includes both the speed of an object and the direction it is moving.
Velocity
Which of the following is a push or pull?
a. force
A soccer ball will not move until it is kicked is which law?
Newton's 1st Law
The downward force exerted on an object falling through the air _______.
gravity
Which of the following objects is NOT accelerating?
a. A car rounding a corner.
b. Earth orbiting the sun
c. A ball rolling to a stop
d. A runner jogging at a constant 8mph
d. a runner jogging at a constant 8mph
Sarah took 45 minutes to travel to her cousin's house, which was 4km away. What was her speed?
0.08km/min
A feather will fall through the air more slowly than a brick because of _______.
State Newton's Third Law of Motion
For every action there is an equal and opposite reaction.
An example of a projectile would be ______.
a. a soccer ball sitting on a field
b. a phone ringing
c. throwing a ball for your dog
d. pushing a lawn mower.
c. throwing a ball for your dog
Explain the difference between distance and displacement.
Distance is how far an object has moved. Displacement is distance and direction of object from start to end.
If sound travels at the speed of 330 m/s, how long will it take for the sound of thunder to travel 1,250 m?
3.79 sec
Which of the following is a force?
a. acceleration
b. friction
c. inertia
d. velocity
b. friction
The relationship among mass, force and acceleration is explained by Newton's ______ law.
2nd
When an object moves in a circular path, it accelerates toward the center of the circle as a result of _________.
Compare
Describe the difference between average speed and constant speed.
Average speed is total distance/time. Constant speed means speed does not change.
What formula is used to calculate acceleration?
a = (vf - vi)/t
If a 80kg swimmer pushes off a pool wall with a force of 225N, at what rate will the swimmer accelerate forward?
2.8m/s2
When you row a boat, the action of the rows cause the boat to move forward. This moving of the boat is an example of a __________ force.
reaction
mass, distance
An astronaut on the moon would have the same _____ as on Earth.
mass
Explain why highways have speed limit signs rather than velocity limits.
Speed is the distance an object travels over time; velocity would also include direction.
After a soccer ball is kicked into the air, what force or forces are acting on it?
gravity and friction
It requires less force to move a bicycle than a motorcycle. Which law is this?
Newton's 2nd Law
Explain what causes the path of a projectile to be curved.
Horizontal and Vertical Motion
What is the momentum of a 0.2kg ball moving with a speed of 5m/s?
1 kg per m/s