Motion
Force
Newton's Laws
Mass & Weight
Calculations
100
What determines the motion of an object?
All the forces acting on it added together.
100
If a moving object suddenly changes its direction, what must have happened?
a. Friction was removed.
b. A force acted on it.
c. The object lost weight.
d. The mass increased.
B. A force acted on it.
100
Define Newton's First Law.
An object at rest will remain at rest unless an unbalanced force acts upon it.
An object in motion will stay in motion unless an unbalanced force acts upon it.
100
Define "mass".
The amount of matter in an object.
100
Due to friction, the work put into a simple machine is always ________ the work output.
a. less than
b. equal to
c. greater than
d. unrelated to
c. greater than
200
What is the force that resists or slows down motion when two surfaces touch?
Friction
200
What is the unit of measurement used for force?
Newtons
200
If you increase the force on an object, what happens to its acceleration?
AND what law is this?
Acceleration increases.
Newton's Second Law.
200
Give an example of "work".
Anything that has to do with motion AND movement.
Work is done when a force is applied to an object AND causes the object to move a certain distance in the direction of the force.
200
Which would be different for an object if measured on Earth versus on the Moon?
a. Mass
b. Volume
c. Weight
d. Density
c. weight
300
Why does a car have an impact area and/or an airbag in the case of a car accident?
Provides extra time/cushioning which decreases the driver's acceleration toward the steering wheel.
300
Forces always occur in:
a. singles
b. pairs
c. triples
d. clusters of ten
b. pairs
300
A magician pulls a tablecloth out from under a set of dishes without moving them. Which of Newton's laws best explains why the dishes stay in place?
Newton's First Law (Inertia)
300
What is the purpose of simple machines?
To make work easier.
300
The shopper applies 24 N of force to the grocery cart, and 168 J of work is done.
How far did the grocery cart move?
7 units
Make sure you click the appropriate unit of DISTANCE!
400
What property is demonstrated by the sodas in the back seat? (BE SPECIFIC)
Your aunt is driving you home after getting McDonald's.
You bought take-out for all your family members and placed the drinks on the back seat.
Your aunt SLAMS on the brakes when a baby raccoon runs out in front of the car.
The drinks slide forward and spill all over the back of the front seats.
Inertia
400
What happens to an object if the total force is zero?
Its motion does not change.
400
Define Newton's Third Law.
There is an equal and opposite force.
For every action, there is an equal and opposite reaction.
400
Which of the following statements best describes the difference between mass and weight?
Mass is a measure of the amount of matter, while weight is a measure of the force of gravity.
400
If you have a ball that is 0.4 kg with an acceleration of 600 m/s^2.
What was the force of the ball when released?
240 Newtons
500
Which of the following is an example of acceleration?
a. A person standing still at a bus stop.
b. A book sitting on a high shelf.
c. A car traveling at a constant 60 mph on a straight highway.
d. A coaster car is slowing down as it goes up a hill.
d. A coaster car is slowing down as it goes up a hill
500
Which requires more force to move?
An object that weighs 0.5kg or 10kg?
An object that weighs 10kg.
500
If you push against a wall with 100 N of force, how much force does the wall push against you?
100 N
Equal and Opposite
500
An astronaut travels from Earth to the moon, where gravity is much weaker.
What happens to the astronaut's mass and weight?
a. Mass stays the same, but weight decreases.
b. Both mass and weight stay the same.
c. Both mass and weight decrease.
d. Mass decreases, but weight stays the same.
a. Mass stays the same, but weight decreases.
500
If a 10,000 Watt machine can produce a tank full of helium in 4,000 seconds, how many Joules of work did it do?
40,000,000 Joules