Forces, Friction, and Gravity

Forces:

Friction, Gravity, Weight, & Falling Objects

Multiple Choice

Friction is a force that acts in an ___________ direction of movement.

• similar
• opposite
• parallel
• west

Multiple Choice

Without friction, an object in motion would never stop.

• true

• false

Multiple Choice

How would the absence of friction affect a marble travelling on a long, straight path?

• the marble's speed would decrease

• the marble would remain at a constant speed

• the marble's speed would increase

• the marble would stop immediately

Multiple Choice

Rough surfaces have _________

• greater friction

• less friction

• the same level of friction

Multiple Choice

Sally experiences-

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

Multiple Choice

Wheels on a skateboard most likely experiences-

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

Multiple Choice

Swimming fish experience-

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

Multiple Choice

When we rub our hands together _________.

• frictional force works between them

• energy is released

• our hands become warm

• all off the above

Multiple Choice

What is gravity?

• A force
• Energy
• A push
• All of them

Multiple Choice

Two factors effecting the magnitude of force of gravity between 2 objects are...

• weight and mass 
• distance and weight 
• mass and matter 
• mass and distance 

Multiple Choice

The law of universal gravitation is credited to whom? 

• Einstein 
• Galileo
• Darwin
• Newton 

Multiple Choice

What is the SI unit used to measure force? 

• pounds 
• grams 
• newtons 
• kg/ m²

Multiple Choice

As mass increases, what happens to gravitational force?

• increases
• decreases
• stays the same
• i don't know

Multiple Choice

Which statement about gravity is true?

• gravity causes objects to pull towards one another

• gravity causes objects to push away from each other

• gravity only takes place between planets

• the moon doesn't have any gravity

Multiple Choice

A person would weigh less on the moon than on the Earth because...

• the moon has less mass, and therefore less gravity
• the moon has more mass, and therefore less gravity
• the moon has less mass, and therefore more gravity
• the moon has more mass, and therefor more gravity

Multiple Choice

A person would weigh more on Jupiter than on the Earth because---

• Jupiter has less mass, and therefore less gravity
• Jupiter has more mass, and therefore less gravity.
• Jupiter has less mass, and therefore more gravity.
• Jupiter has more mass, and therefore more gravity

Multiple Choice

John has a mass of 125kg on Earth. What is his weight?

• 125 pounds

• 1225 Newtons

• 275 Newtons

• 9.8 Newtons

Multiple Choice

John takes the space shuttle to Jupiter. What will happen to John's mass?

• His mass will increase

• His mass will decrease

• His mass will remain the same

• His mass will increase but and his weight will decrease.

Multiple Choice

What will John's (125 kg) weight be on Jupiter. Jupiter's gravity is 26.5m/s/s.

• 4.71 Newtons

• 1225 Newtons

• 3312.5 Newtons

• 125 pounds

Multiple Choice

What force causes objects to fall?

• gravity
• friction
• air

Multiple Choice

What will happen if you drop a golf ball, a baseball, and a bowling ball at the same time from the top of a building?

• The bowling ball will hit the ground first

• The golf ball will hit the ground first

• The baseball will hit the ground first

• All three will hit the ground at the same time

Multiple Choice

When a feather and a bowling ball are dropped at the same time, why does the feather hit the ground last?

• gravity

• air reistance

• free fall

• terminal velocity

Multiple Choice

What force causes objects falling near Earth's surface to slow down?

• Gravity
• Air Resistance
• Centripetal Force
• Newtons