12IB Topic 2 Revision

A body moves on a straight line. The graphs show the variation of displacement with time.Which graph shows motion with negative acceleration?

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In which diagram are the forces balanced?

• A

• B

• C

• D

A Weight W is suspended from two strings. What is the weight?

• 10 N

• 20 N

• 30 N

• 34.6 N

A small explosion is used to separate a space capsule from its rocket, after the rocket fuel is used up.

Which statement(s) about the process are true?

• the total momentum of the system increases

• the total kinetic energy of the system increases

• the total momentum of the system remains constant

• the total kinetic energy of the system remains constant

The momentum of a system is conserved if

• no external forces act on the system

• no friction forces act within the system.

• no kinetic energy is lost or gained by the system

• the forces acting on the system are in equilibrium

The area between the line of the graph and the time-axis represents 

• the average velocity of the object. 
• the displacement of the object. 
• the impulse acting on the object. 
• the work done on the object. 

A constant force is applied to a ball of mass m. The velocity of the ball changes from v₁ to v₂ . The impulse received by the ball is 

• m(v₂ +v₁) 
• m(v₂ −v₁) 
• m(v₂² + v₁² ) 
• m(v₂² − v₁² ) 

What is the area under an acceleration time graph?

• speed

• change in speed

• velocity

• change in velocity

• distance

What is the gradient of a velocity time graph?

• acceleration

• distance

• displacement

• speed

Which of these could not be a positive acceleration?

• Acceleration towards the Earth as an object falls.

• Slowing down while moving in the negative direction.

• Speeding up while moving in the positive direction.

• Acceleration of an object thrown upwards from the surface of the Earth with an initial velocity of 8m s^-1.