IB SEHS B.2

Which best describes Newton’s first law of motion?

• An unbalanced force acts on a body

• For every action force, there is an equal and opposite reaction force

• An object will remain stationary or will move at a constant velocity or in a straight line

• The amount of change in the momentum of an object

What is displacement?

• The speed of an object in a certain direction

• The amount of motion possessed by a moving body

• The rate of change in velocity

• The shortest distance from the initial to the final position of a moving body

A sports scientist measures the force that is being applied by a baseball into a glove and the time over which the force is being applied. Which of the following can be calculated from the measurements?

• Impulse

• Momentum

• Friction

• Torque

Which of the following defines momentum?

• Force × Time

• Mass x Velocity

• Velocity × Time

• Mass × Distance

Which is an example of Newton’s second law of motion?

• The ball will travel faster if greater force is applied by the foot.

• The ball applies a backwards force on the foot as it is kicked.

• The ball is stationary on the penalty spot until it is kicked.

• Once kicked, a ball in flight is affected by gravity.

Tags

NGSS.MS-PS2-2

Which of the following describes Newton’s third law of motion?

• The rate of change of momentum of a body is proportional to the force causing it.

• To bring about motion a force must be applied.

• When one body applies a force to another, the second body will apply an equal and opposite force back.

• The effect of a constant force on a mass will always be the same.

Tags

NGSS.MS-PS2-1

What is the definition of centre of mass?

• A measurement that has both size and direction

• A measurement that only has size

• A point of interaction between two objects

• A point at which the weight of an object is balanced in all direction

Which is the equation for force?

• mass × acceleration

• force/time

• velocity/ time

• velocity x time

Tags

NGSS.MS-PS2-2

Why would a high jumper arch their back while passing over the bar?

• To increase the speed at take off

• To move their centre of mass outside of their body

• To increase moment of inertia

• To optimise angle of take off

The diagrams show a gymnast somersaulting. In which position does the gymnast experience the greatest moment of inertia?

• A

• B

• C

• D