IB Physics Unit A Paper 1 Review

A car has an initial speed of 16 m s−1. It decelerates at 4.0 m s−2 until it stops.

What is the distance travelled by the car?

• A.  4 m

  
  

• B.  16 m

  
  

• C.  32 m

  
  

• D.  64 m

  
  

A car travels clockwise around a circular track of radius R. What is the magnitude of displacement from X to Y?

• A.  R(3*pi/2)

• B.  R(pi/2)

• C. R*squareroot(2)

• D. R

The variation with time of the displacement of an object is shown. What are the average speed and average velocity of the object over the 10 s time interval?

• A. Average Speed = 0.8 ms^-1, Average Velocity = 0.8 ms^-1

• B. Average Speed = 0.8 ms^-1, Average Velocity = 1.2 ms^-1

• C. Average Speed = 1.2 ms^-1, Average Velocity = 0.8 ms^-1

• D. Average Speed = 1.2 ms^-1, Average Velocity = 1.2 ms^-1

An object is travelling with velocity 5 m s−1. The object then accelerates to 15 m s−1 in the same direction.

What is the variation with time of the acceleration of the object?

• 
• 
• 
• 

A car on a road follows a horizontal circular path at a constant speed. What is the direction of the net force acting on the car and the direction of the instantaneous velocity of the car?

• A

• B

• C

• D

A person stands in an elevator (lift). The total mass of the person and the elevator is 800 kg. The elevator accelerates upward at 2.0 m s^−2. What is the tension in the cable?

• A.  1.6 kN

• B.  6.4 kN

• C.  8.0 kN

• D.  9.6 kN

A toy balloon floats at the end of a string. A wind blows horizontally to the right. The balloon is in translational equilibrium. What is the free-body diagram of the forces acting on the balloon?

• 
• 
• 
• 

Two bodies collide on a horizontal frictionless surface. Body X, of mass 2.0 kg, moves with an initial speed of 0.80 m s−1 and body Y is initially stationary. After the collision, body X moves at an angle of 90° to the initial direction of motion with a speed of 0.60 m s−1. What is the magnitude of the momentum of body Y after the collision?

• A.  0.40 kg m s−1

• B.  1.0 kg m s−1

• C.  2.0 kg m s−1

• D.  2.8 kg m s−1

A mass on the end of a string is rotating on a frictionless table in circular motion of radius R1 and undergoes an angular displacement of θ in time t. The string tension is kept constant, but the angular displacement of the mass is increased to 2θ in time t. The radius of the motion changes to R2.

What is R2?

• A. R1/4

• B.  2R1

• C.  4R1

• D. R1 * R2

The angle θ between a ramp and a horizontal surface slowly increases from zero. An object on the ramp does not slide as θ increases. The frictional force on the object is

• A.  constant.

• B.  negligible.

• C.  proportional to cos θ.

• D.  proportional to sin θ.