Week 8

Question 0

When balanced forces act on an object it will either?

Answer 0

Remain stationary

Continue with a constant velocity

Question 1

When an __________ force acts on an object it will _________.

Answer 1

Unbalanced

Accelerate

Question 2

What energy is known as kinetic energy?

Answer 2

The energy of a moving object

Question 3

Equation for kinetic energy?

Answer 3

KE = ½ mv²

KE = kinetic energy (J)
m = mass (kg)
v = velocity (m/s)

Question 4

What energy is known as gravitational potential energy?

Answer 4

The energy of an object above ground.

Question 5

Equation for gravitational potential energy?

Answer 5

GPE = mgh

GPE = gravitational potential energy (J)
m = mass (kg)
h = height (m)

Question 6

What two things are the same concept?

Answer 6

Energy and work

Question 7

When is work done?

Answer 7

When energy is transferred to an object.

Question 8

Symbol for momentum?

Answer 8

ρ

Question 9

Any object with a ____ and ________ has momentum.

Answer 9

Mass

Velocity

Question 10

Momentum is the product of ?

Answer 10

Mass and velocity

Question 11

Equation for momentum?

Answer 11

ρ = m × v (mv)

ρ = momentum (kg × m/s or kg.m.s -¹)
m = mass (kg)
v = velocity (m/s)

Question 12

What happens when objects hit each other?

Answer 12

Momentum is conserved

Question 13

Large mass = ?

Answer 13

Small acceleration

Question 14

Small mass = ?

Answer 14

Large acceleration

Question 15

If a bug flew into a truck,

a) the truck would have a larger force
b) the bug would have a larger force
c) the force would be the same

Answer 15

c) the force would be the same

Force (bug) = m × A
Force (truck) = M × a

Question 16

Equation for efficiency

Answer 16

E% = Useful over total times 100