10th U1 Test - Clarifications

10th U1 Test - Clarifications B

Multiple Choice

The unbalanced force is equivalent of the product of mass of the system and its ___.

• force
• velocity
• acceleration

Multiple Choice

unit for mass

• kilogram
• newton
• meter
• second

Multiple Choice

What will be the graph for velocity?

​https://ophysics.com/k6.html

Multiple Choice

__ is the magnitude (not vector) of the acceleration due to gravity

• 9.81 ms^-2

• 9.81 ms^-1

• -9.81 ms^-2

• -9.81 ms^-1

Magnitude and direction

​

Example:

Displacement: +25m or 25 m to the right.​

​

Gravity (vector): -9.81 ms^-2​

Vector

Only magnitude.

​

Example:

Distance: 25 m​

​

Gravity magnitude: 9.81 ms^-2

No negative sign, just magnitude.​

​Scalar

Scalar vs Vector

Multiple Choice

Which magnitude has no units?

• µ
• Ff
• m
• R

Multiple Choice

What is its weight? (g≈10)

• 10,000 N

• 10,000 kg

• 1,000 N

• 1,000 kg

Fill in the Blank

Net force = +20N and Thrust = +80N. What is its Drag force? (g≈10)

Only numbers with "+" and "-".

Fill in the Blank

Weight=200N and F_{app (vertical)}= –20N. What is its Normal Force? (g≈10)

Only numbers and "+" or "-".

Fill in the Blank

Weight=200N and F_{app (vertical)}=+20N. What is its Normal Force? (g≈10)

Only numbers with "+" or "-"

Fill in the Blank

If m=50kg and F_{app (vertical)}=+100N. What is its Normal Force? (g≈10)

Only numbers with "+" or "-"

Fill in the Blank

If m=50kg and F_{app (vertical)}= –100N. What is its Normal Force? (g≈10)

Only numbers with "+" or "-".

Fill in the Blank

m=50kg, a=+10ms^-2 and Drag=–500N. What will be its Thrust? (g≈10)

Multiple Choice

m=50kg, a=-10ms^-2 and Drag=–1,000N. What will be its Thrust? (g≈10)

• +1,000N

• -1,000N

• +500N

• -500N

Multiple Choice

If a person is about to push with +400N a mass of 40kg. Is it going to be moved? (µ_s=0.6, µ_d=0.4, g≈10)

• Yes, and while it's moving Ff_d = -160N.

• Yes, and while it's moving Ff_d = -240N.

• No, because its Ff_s max = 240N

• No, because its Ff_s max = 160N

Multiple Choice

If a person is about to push with +400N a mass of 90kg. Is it going to be moved? (µ_s=0.6, µ_d=0.4, g≈10)

• Yes, and while it's moving Ff_d = -540N.

• Yes, and while it's moving Ff_d = -360N.

• No, because its Ff_s max = 540N

• No, because its Ff_s max = 360N

Unit 2 is about Energies and we will need 'suvat' and forces.

​

​Thank you!