Vocabulary
A push or pull that can act on or change an object
What is a force?
Alex threw a baseball into the air, and he caught 1 second later.
Brad threw a baseball into the air, and he caught it 0.5 second later.
Mia threw a baseball into the air, and she caught it 2 seconds later.
The person who exerted the most force on the baseball is ...
Mia
A soccer player kicks a ball into the air during a game. The ball soars high above the field before dropping back down. Which BEST explains what happens to the ball?
Gravitational force pulls the ball back to the ground.
A bowling ball, a beach ball, and a basketball are rolled with the same force along a horizontal surface. The ball that will roll the shortest distance is the ...
What is the bowling ball?
**The same force is applied to each ball. The ball with the greatest mass (the bowling ball) will have the least acceleration.
Unequal forces that cause an object's motion to change
What are unbalanced forces?
An opposing force caused by two objects touching each other; a contact force that will cause motion to slow or stop
What is friction?
During recess, Liam slides down the slide. What is the most likely reason he moves downward?
Gravitational force pulls her down the slide.
The water and soap on a slip-n-slide reduces this force, which makes sliding easier (and less painful!)
What is friction?
The tendency to do nothing or to remain unchanged
What is inertia?
A noncontact force that pulls masses toward large objects, such as the Earth or the sun
What is gravity?
Ava is racing two wagons. One wagon is loaded with heavy books, and the other is empty. What will she need to do to make both wagons move at the same speed?
She can push both wagons for the same amount of time, but she will have to push the loaded one with more force.
What happens to the speed of an object when the position does not change over a period of time?
speed remains zero
What is a Newton?
A noncontact force that either pulls opposite ends of a magnet together or pushes like ends of a magnet apart
What is magnetic force?
**Remember, opposites attract!
The greater the force applied to an object, ...
a. the faster the object will accelerate.
b. the slower the object will accelerate.
What is a. the faster the object will accelerate?
You slip on tile while wearing socks because friction...
a. increases.
b. decreases.
What is decreases?
A change in speed or direction
What is acceleration?
A cyclist pedals at a steady speed of 15 miles per hour. How far will the cyclist travel in 4 hours? (distance = speed × time)
60 miles
Newton's First Law states that an object at rest will ...
What is stay at rest, unless acted upon by an unbalanced force?
A delivery van is driving at 60 mph while filled with packages. After dropping off all the packages, the van drives at 60 mph again. Which BEST explains how the force needed to move the van changed after it was unloaded?
A smaller force was needed to move the van because it had less mass.