Week 23 CCA Review | Forces and Motion

Question 1

Which will weigh more: 1000 bricks or 1000 feathers

Accepted Answer

um...the bricks

Question 2

1st Law:

Accepted Answer

objects continue in current motion until acted on by a force

Question 3

Calculate momentum: a 1000kg pickup truck going 20 m/s

Accepted Answer

20,000 kg m/s

Question 4

Reaction force of a surface (table or the floor) that supports objects resting on them

Accepted Answer

normal force

Question 5

What is the result of adding OR subtracting all the forces together?

Accepted Answer

net force

Question 6

What is the symbol for momentum?

Accepted Answer

p

Question 7

This is a reaction only force that always pushes against the motion of a moving object.

Accepted Answer

friction

Question 8

Newton's third law states that because you push down on a chair when you sit:

Accepted Answer

the chair pushes back up on you equally

Question 9

If an object is pushed with 1/2 the force, how much acceleration will it have?

Accepted Answer

1/2 as much

Question 10

What is the SI unit for mass?

Accepted Answer

kilograms

Question 11

a 200kg space probe has 400,000 kg m/s of momentum - what is it's velocity?

Accepted Answer

2000 m/s

Question 12

Weight includes....

Accepted Answer

mass and acceleration

Question 13

What force would cause a 200kg object to accelerate at 2 m/s2 ?

Accepted Answer

400 N

Question 14

What is resistance to change?

Accepted Answer

inertia (more mass means more inertia)

Question 15

if 400N of force is applied to a 40kg object, what acceleration will it experience?

Accepted Answer

10 m/s2

Question 16

Which type of friction does this picture represent?

Accepted Answer

rolling friction (pushing a shopping cart across the floor)

Question 17

What two things determine how much momentum an object has?

Accepted Answer

mass and velocity

Question 18

Acceleration is caused by:

Accepted Answer

UNbalanced net force

Question 19

What is the term used to describe the effect of gravity on an object?

Accepted Answer

weight

Question 20

A bug hits your windshield with 0.3N of force - how much force does the windshield hit the bug?

Accepted Answer

-0.3 N

Question 21

Friction depends on the surface - which would have the LOWEST amount of friction?

Accepted Answer

A tile floor

Question 22

Force that exists between any two objects, depends on mass, pulls things down to the ground

Accepted Answer

gravity

Question 23

Which has more mass: 100 kg of iron or 100 kg of table salt?

Accepted Answer

neither - they are the same

Question 24

2nd Law:

Accepted Answer

when force is applied objects accelerate according to mass

Question 25

3rd Law:

Accepted Answer

forces come in action-reaction pairs

Week 23 CCA Review | Forces and Motion

Questions 25

Week 23 CCA Review | Forces and Motion

Questions 25