Motion and Force Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Why does a apple reach the ground first over a leaf,

A

air resistance depends on shape
[or other correct statement about air resistance
air resistance less significant
air resistance less, therefore greater velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

the leaf accelerates at first then reaches a terminal velocity, explain how

A

gravity greater than air resistance
[or (initially only) weight/gravity acting
hence resultant force downwards or therefore acceleration (2nd law)
air resistance or upward force increases with speed
until air resistance equals weight or resultant force is zero

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Newtons second law

A

Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What would the energy changes be for a girl jumping in the air from a trampoline

A

-(elastic potential) energy is transformed to kinetic
energy
- (the gymnast) must bend knees (do work) (to increase height)
- Work is done against the resistive forces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly