# Unit 7 - Forces

15 Questions | Total Attempts: 36  Settings  A 15 question quiz on forces.

Related Topics
• 1.
Which forces could be labelled on a yo-yo?
• A.

Gravity

• B.

Normal

• C.

Friction

• D.

Centripetal

• 2.
What is the symbol for acceleration due to gravity?
• A.

A

• B.

G

• C.

9.8

• D.

M/s^2

• 3.
A body weighs 125 N in a place where acceleration due to gravity is 10 m / s2. Calculated: a) the mass of the object, b) the weight of the object in a place where the acceleration of gravity is 9.65 m / s2.
• A.

1250 kg and 121 N

• B.

1250 g and 12.1 N

• C.

12.5 kg and 121 N

• D.

12.5 kg and 12.1 N

• 4.
A 28-ton truck changes its speed over 200 s from 36 km/h to 54 km/h. Determine the force exerted by it.
• A.

1400 N

• B.

500 N

• C.

900 N

• D.

700 N

• 5.
On a body of 200 kg, a force is exerted 400 N. Calculate the acceleration acquired by the body and use this to, assuming the object begins at rest, how fast will be travelling(in m/s) after 10 s?(Type only the number e.g. 15)
• 6.
Which units could be used for pressure? (Write down the formula first to help)
• A.

N/m2

• B.

Pa

• C.

KPa

• D.

N/mm2

• 7.
What is the pressure produced by a force of 25000 N acting on an area of 5 m2.
• A.

5 Pa

• B.

50 Pa

• C.

500 Pa

• D.

5000 Pa

• 8.
Determine the surface, in m2, of the base of a monument of 30 tonnes if the pressure exerted on its base is 25 N/cm2. (g=10 m/s2)
• A.

0.6

• B.

0.8

• C.

1.0

• D.

1.2

• 9.
Calculate the pressure of a monument of 30 tonnes if its base is a rectangle measuring 20 cm long and 1.5 m wide. (g = 10 m / s2)
• A.

1000000 Pa

• B.

500 Pa

• C.

20000000000000 Pa

• D.

150 Pa

• 10.
When talking about pressure that is felt by an object underwater we use the term "hydrostatic". To calculate this pressure we use the equation: p = __ · __ · __Write the 3 letters used below without spaces between them.
• 11.
Calculate the pressure in the S.I units, which a diver feels when they are 5 m deep. Density of seawater is 1.1 g / cm3. (g=10 m/s2)
• A.

50000 Pa

• B.

55000 Pa

• C.

60000 Pa

• D.

65000 Pa

• 12.
A child gets into a pool, dislodging water weighing 600 N.What mass is the boy assuming he is only just floating in the water? (Use g=9.8)
• A.

61 kg

• B.

68 kg

• C.

74 kg

• D.

80 kg

• 13.
A steel ball of radius 5 cm is immersed in pure water. Calculate the thrust of the water and the weight of the ball (density of steel = 7.9 g / cm3). Vsphere = (4/3)·r3
• A.

2.63 and 18.9

• B.

1.63 and 12.9

• C.

5.63 and 14.0

• D.

3.63 and 3.9