What type of forces would cause an object NOT to move?

• Unbalnaced forces

• space forces

• Balanced forces

• non-contact forces

How do planets get their shape?

• Asteroids hitting the outside edges of celestial bodies

• Gravity pulls things towards a center, creating a sphere shape

• the absence of gravity in space does not allow for hard ocrnered objects

• Inertia rolls objects into a sphere shape

When does GRAVITATIONAL POTENTIAL ENERGY increase?

• when kinetic energy increases

• when you are in a vacuum room with no air resistance

• When an object's distance from the ground increases

• When an object is laying still on the ground

What are the two factors that affect gravity?

• Mass and distance

• speed and mass

• direction and temperature

• speed and force

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How do contact forces differ from non-contact forces ?

• Contact forces will be able to change an object's direction, non-contact forces can't

• Only contact forces are affected by gravity

• non-contact forces have greater speed than contact forces

• Gravitational and magnetic forces can transmit energy between two objects that are not touching. Contact forces act only on objects that are touching.

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What is the law of conservation of energy?

• An object in motion will stay in motion

• For every action, there is an equal and opposite reaction

• Energy cannot be created or destroyed but it can be transformed

• the rate of gravitational acceleration is always 9.8 m/s

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What is kinetic energy?

• the energy of things in motion

• the energy of things with the potential to be in motion

• Mechanical energy is the same as this

• the force of gravity that pulls you down

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Finish this sentence: The more mass a moving object has . . .

• the more kinetic energy it has

• the heavier it is

• the more potential for movement it has

• the more unbalanced forces can affect it

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What is mechanical energy?

• The force of inertia and gravity together

• the opposite of potential energy

• the energy gained by unbalanced forces

• the sum of all kinetic energy and all potential energy of an object

How do you calculate SPEED?

• Time divided by distance

• Mass times acceleration

• Distance divided by time

• Subtract the time from the distance