Forces and Motion
What force acts on a box sitting on a table?
Gravity
The force that opposes, or acts against, motion when two surfaces rub up against each other.
Friction.
The formula for speed is...
distance divided by time. D/T
True or false: Data collected correctly does not need units included (example: The distance the block travelled was 12).
False- We always NEED to include units
A DISTANCE/TIME graph with a horizontal line shows what kind of motion? (Draw it with time on the x-axis and distance on the y-axis)
no movement or an object at rest.
Two students push on a box with equal force. What happens to the box?
The variable in an experiment that depends on the changes a scientist makes
Dependent variable
It took a bus 5 hours to travel 300 miles. The average speed of the bus was..
60 miles per hour.
True or False: If a student has a large ball of slime and then flattens it into a circle, the slime's weight and mass will not change
True: Gravity still pulls down the same amount of force (same weight) and the amount of matter in the object stays the same (same mass).
A DISTANCE/TIME graph with an upward diagonal line shows what kind of motion? (Draw it with time on the x-axis and distance on the y-axis)
a constant rate of speed, increasing distance and increasing time
Out of the following properties, which TWO describe the motion of a launched rocket:
weight, height, length, direction, shape, speed, mass
Speed and direction
This is speed with direction.
Velocity.
True or False: Friction decreases speed.
True.
What data point would come next if the pattern continues:
0.8m, 1.0m, 1.2m, 1.4m, _____
1.6m (the pattern shows increasing by 0.2m each time)
A POSITION/TIME graph with a horizontal line shows what kind of motion? (Draw it with time on the x-axis and position on the y-axis)
no motion, the object stopped
Which force causes a thrown ball to fall downward?
Gravity
This is any change in velocity.
acceleration.
Name at least 3 things that could change an object's velocity.
What is speed it up, slow it down, stop it, or change it's direction.
When conducting an experiment, what should you do to get more accurate results (hint: Is just doing one trial for each measurement very accurate?)
We should conduct multiple trials (at least 3 trials would give more accurate results!)
A SPEED/TIME graph with a diagonal line shows what kind of motion? (Draw it with time on the x-axis and speed on the y-axis)
speeding up or accelerating.
If you put a brick on the moon, what would happen to its mass and its weight?
Its mass would not change but its weight would decrease because the force of gravity is not as strong on the moon.
The variable in an experiment that the scientist changes to be tested
It took the coach 10 minutes to travel each of the following distances. When was the coach moving the slowest?
Car to the locker room: 60ft
Locker room to the gym: 20ft
Gym to the office: 30ft
Locker room to the gym (moving 2ft/minute)
What is a constant in an experiment?
A condition that needs to be kept the same during all tests and trials.
There are two diagonal lines on a DISTANCE/TIME graph representing the motion of two objects. One line is steeper than the other. How would you describe the motion of the object with the steeper line? (Draw it with time on the x-axis and distance on the y-axis)
it is going faster