A collision doesn't change the total momentum of a group of objects.
True
False
True
Friction is an outside force that cause the total momentum to increase.
True
False
False
Friction causes the total momentum to decrease
Objects can ________when they collide.
B) both a & b
Distance traveled and displacement are always equal.
True
False
False
Only when the body moves in one straight line would the distance traveled and displacement be equal.
When an object changes direction it is accelerating.
True
False
True
An object is accelerating if its speed or direction changes with time. Since speed and direction are the components of velocity, an object is accelerating if its velocity changes with time.
If two objects are moving at the same speed, the _____ object is harder to stop.
a) lighter
b) heavier
c) both a & b
d) none of the above
A horizontal line on a distance time graph means the speed is zero.
True
False
True
A horizontal line represents that the object is remaining at a fixed distance. Typically that means it is not moving.
Momentum equals mass divided by velocity.
True
False
False
P = mv
where P = momentum
m = mass
v = velocity
Speed always is measured in kilometers per hour.
True
False
False
An object's momentum _____ if it's speed ____.
A) increases, increases
An object's momentum increases if it's speed increases.
If a car is accelerating, it's speed must be increasing.
True
False
False
If a car is accelerating it does not mean that its speed is increasing, the car can be moving forward at the same speed. An accelerating object is an object that is changing its velocity.
Speed and velocity are the same thing.
True
False
False
Speed is the rate or a measure of the rate of motion
Velocity is the rate of speed of action
Author
carrieross
ID
46323
Card Set
Motion, Forces & Energy
Description
A review of Glencoe's 8th Gr text Book for Science Unit 6 Ch 18 Motion, Forces & Energy p. 522A & B
