Energy
The speed and direction of an object.
velocity
unbalanced forces
A boy pushes on a box and moves it across the room. This is an example of _____.
A. balanced forces
B. unbalanced forces
C. potential energy
D. chemical energy
A. balanced force
Which indicator or statement below can be used to determine why more pins will fall for one person than for another person when the bowling ball strikes the same pin in the middle?
A. The color of the ball.
B. The height of the person.
C. The length of the person’s arm.
D. The speed of the ball.
D. The speed of the ball.
energy
The change in an object's position.
motion
Forces that act on an object, but does not change the object's motion.
balanced forces
Dana is the pitcher for her community baseball team. What force causes the baseball to change direction when it is hit by the bat?
A. The catcher’s force on the ball with his mitt.
B. The batter’s force on the ball as he misses.
C. The pitcher’s force on the ball as he throws.
D. The batter’s force on the ball with the bat.
D. The batter’s force on the ball with the bat.
increase
What is the energy of motion?
Kinetic energy
How fast an object's position change over time.
speed
A force that stops or slows objects from moving.
friction
_________ describes when a moving object speeds up.
A. Acceleration
B. Velocity
A. Acceleration
If a toy car is moving slower, then there was a __________ in energy.
decrease
What is the energy that is stored?
Potential energy
any push or pull
force
A force that pulls objects to Earth.
gravity
If you drop a rock in a lake, the rock will slow down because the water exerts ____.
A. gravity
B. less resistance
C. drag forces
D. velocity
C. drag forces
Which car will have less energy and less speed:
a car rolling down a high ramp
a car rolling down a low ramp
a car rolling down a low ramp
The energy an object has because it is moving.
mechanical energy
The tendency of an object in motion to stay in motion, and an object at rest to stay at rest.
inertia
This force hits objects in the air and slows them down—the more surface area, the greater the force.
air resistance
What causes heat when rubbing your hands together?
friction
You and your friends slap high fives after you have won a game. What is the contact of you and your friends hands called when you high five each other.
a collision