Phases
Four states of matter?
solid, liquid, gas, and plasma.
According to Newton's first law of motion, what will a moving object that is not acted on by an unbalanced force do?
Keep moving
According to Newton's 2nd law, if there is an increase in force, what will happen to the acceleration o f the object? What is the formula?
F= ma The acceleration will increase.
Which of the following objects have the LEAST inertia: a 500 kg dump truck full of dirt, a 1000 kg car , a 1 kg rock, or a 1kg cat?
The Cat.
What happens if the motor of a car at rest exerts more force than the frictional forces holding it in place?
It will move forward.
The freezing point temperature is the same temperature as which other point during the phase change?
Melting.
What do balanced forces equal?
No movement
What is the SI unit for speed?
m/s
a student kicks a 0.5 kg ball. She then kicks a 50 kg rock with the same force. What can be said about the acceleration of the ball as compared to the rock?
The ball will have greater acceleration.
What explains the tendency of all objects to resist any change in motion?
Friction and gravity can hold it in place.
Describe the difference between gas and plasma.
Plasma has electrically charged ions.
Which of Newton's laws explains inertia?
His first law.
What is the SI unit for acceleration?
m/s/s or m/s squared.
Whar force is necessary to accelerate a 1,250 kg car at a rate of 40 m/s/s, using F= ma?
F = 50,000 N
The law of conservation states that when two objects collide, what happens to their combined momentum?
It remains the same.
What is the universal solvent?
Water.
What is a measure of inertia?
An objects mass.
Two bicycle ramps have the same height. The first ramp is twice as long as the second ramp. Why does the first ramp have a better mechanical advantage?
Because less force is required to go up it.
How much force is needed to accelerate a 70 kg rider and her 200 kg motor scooter at 4m/s/s?
F = 1080 N
If an astronaut throws a ball in space, when will the ball stop?
It won't unless an outside force stops it.
What is the term to describe changing from a liquid to a gas?
Evaporation.
What does Newton's second law of motion state about an objects acceleration?
That it is directly proportional to the next force acting on it.
What do balanced forces equal?
No movement.
If a person runs 100 m in 12s, what is his/ger speed?
8.3 m/s
All objects accelerate toward the Earth at a rate of 9.8 m/s/s. What is the effect on velocity for every second that an object falls downward?
The velocity increases every 9.8 m/s/s every second.