1
If a car travels 160 miles in 2 hours, what is its speed?
80 mph
What force pulls all objects to the Earth?
gravity
Katie was pulling a sled with her puppy in it. Katie’s sister then got into the sled with the puppy. How would the sled’s speed most likely change after Katie’s sister got into the sled?
The speed would decrease due to the change in mass.
What is a push or pull on an object called?
force
A force that stops or slows an object is called what?
friction
A 30 gram ball rolls along a flat surface at a constant speed in the same direction over 4 meters in 20 seconds. Which is the speed of the ball? (speed = distance ÷ time)
0.2 meters per second
Chris climbs onto a skateboard ramp halfway between the top and the bottom of the ramp. Because gravity acts on Chris, which is most likely to happen?
He will roll down the ramp.
If pushing a sled over grass or ice, which has more friciton?
grass
what is the formula for speed?
distance/time
What is an unbalanced force?
A force that is unequal on each side and will cause it to move in the direction that greater force is pushing
What is the distance an object travels over time called?
speed
A car is traveling at a speed of 75 miles per hour. If the car travels for 60 minutes, how many miles did the car travel? (speed = distance ÷ time)
75 miles
What word describes motion that is unchanging?
constant
What is a balanced force?
A force that is equal on both sides and will not move
a builder uses sandpaper on a piece of wood to make it smooth. Did he increase or decrease the amount of friciton?
decrease
basketball players choose their shoes carefully because they want to ___________ friction on the basketball court
INCREASE OR DECREASE?
increase
True or false? air resistance is a type of friction
true
How fast was a train moving if it traveled 100 meters in 10 seconds? (speed = distance ÷ time)
10 meters per second
Object Y traveled 700 meters in 10 seconds. Object Z traveled 500 meters in 10 seconds. How much faster was Object Y than Object Z? (speed = distance ÷ time)
20 meters per second
Which factors affect the motion of an object?
mass- the bigger it is the harder it is to start or stop, friction and gravity
Billy rolls a toy truck filled with marbles across the kitchen floor. He then dumps the marbles before rolling it back to his starting location. How would the speed of the truck most likely change on the way back?
The speed would increase due to a change in mass.
How does mass affect the movement of an object?
the object with less mass will go a greater distance
Newton's first law of motion is also called "The Law of ___________"
inertia
What can cause a moving object to increase its speed in a forward direction?
a constant force moving in the same direction as the object
Carey left a bowling ball and kickball outside on a windy day. Which best explains why the kickball moved but the bowling ball did not?
The kickball has less mass so it was easier to move.