Chapter 18 Test Review

• What is a reference point?

• The object that stays in place in relation to a moving object.

• What 3 factors describe motion?

• Position, direction of motion, and speed.

• What is the equation for acceleration?

• Average acceleration = Final velocity - starting velocity time it takes to change

velocity

• What factors affect an object’s gravitational force?

• Masses of the objects and distance of the objects.

• How do you find the net force of an object?

• Combine all forces acting on an object.

• Compare speed and velocity.

• Velocity must have a direction. Both are the distance an object travels divided by the time it takes.

• What is the affect of an unbalanced force? A balanced force?

• An unbalanced force will cause a change in motion, speed, or direction. A balanced force will not cause change.

• When graphing acceleration or speed: what does an upward slope mean, what does a downward slope mean?

• Upward slope = increase in acceleration, Downward slope = decrease in acceleration.

• Magnetic force: The force that pushes magnets apart or pulls them together.

• Motion: object’s change in position relative to a reference point.

• Gravity: The force of attraction between objects that is due to their mass.

• Friction: a force that always acts to oppose motion.• Electric Force: The force that pushes or pulls

charged objects

• Speed: the distance traveled over time.• Velocity: distance and direction traveled over time.• Law of Universal Gravitation: idea that all objects

in the universe attract each other through gravitational force.

• Acceleration: a change in a moving object’s speed or direction.

• Force: a push or pull that always acts on an object.