Question | Answer |
Acceleration | The rate at which an object's velocity changes. |
Force | A push or pull that acts on an object, causing it to move, change speed or direction, or stop. |
Velocity | Rate at which an object moves in a certain direction. |
Inertia | Tendency of a still or moving object to stay at rest or to continue moving in the same direction at the same speed. |
Mass | Amount of matter in an object. |
Gravity | Force that pulls objects toward the center of the earth. |
Weight | Measure of the force of gravity acting on an object. |
A person drops a bowling ball and a baseball from the top of the play structure. Which ball will hit the ground first? | They hit the ground at the same time. |
Is gravity a contact or non-contact force? | Non-contact force |
If you push a steel ball (25g) and a wooden ball (2.5g) with the same force, which ball will accelerate faster? | The wooden ball. It has less mass. |
What is the main force that stops a ball rolling across carpet? | Friction |
Which law explains that it will take a lot more force to move an elephant than it will to move a squirrel? | Newton's second law of motion |
Kinetic energy | Energy that an object has as a result of its motion. |
Potential energy | Energy that is stored. |
Momentum | Property of matter due to its mass and velocity. |
Friction | Force that opposes motion or resistance caused when two surfaces touch or rub together. |
Distance | How far an object is from one point to another. |
Energy | Ability to do work or cause change. |
Speed | Rate at which the position of an object changes. |
Action-reaction forces are equal in strength and _____ in direction. | Opposite |
As a car rolls down a ramp, it loses potential energy and gains _____ energy. | Kinectic |
True or false? When a car rolls down a hill its speed increases. | True |
In a spring jumper, what provides the action force? | Spring |
In a spring jumper, what provides the reaction force? | Table |
Air resistance | The force exerted by air against an object moving through it and acts in the opposite direction of the object's motion |
Parabola | The downward curve that is created by gravity when an object is thrown horizontally |
All objects appear to 'float' in orbit because of _____. | Free fall |
Microgravity | A term used to describe the almost weightless condition in space. |
A flat piece of paper and a crumpled piece of the same paper are dropped from a height of 4 feet. Which one will fall faster? | Crumpled sheet of paper |
Why would a crumpled sheet of paper fall faster than a flat sheet of paper if both pieces of paper are the same size? | The crumpled sheet of paper has less surface area. Therefore, the crumpled sheet has less drag/air resistance. |