AS Physics - Kinematics, Dynamics, & Forces

Which SI unit, expressed in base units, is not correct?

• unit of force, kg m s^-2
• unit of momentum, kg m s^1
• unit of pressure, kg m^–2 s^–2
• kg m^2 s^-2

A ball is thrown horizontally with a speed of 10.0ms^-1 above horizontal ground. The ball hits the ground after a time of 3.0s. Air resistance is negligible. What is the speed of the ball just before it hits the ground?

• 10ms^-1
• 29ms^-1
• 31ms^-1
• 39ms^-1

Which statement about scalar and vector quantities is correct?

• A scalar quantity has direction but not magnitude.
• A scalar quantity has magnitude but not direction.
• A vector quantity has direction but not magnitude.
• A vector quantity has magnitude but not direction.

An object is moving along the ground in a straight line at a constant speed. Which statement about the resultant force acting on the object is correct?

• The resultant force acting on the object is equal to its weight
• The resultant force acting on the object is equal to the product of its mass and its velocity
• The resultant force acting on the object is equal to the resistive force
• The resultant force acting on the object is equal to zero

What is the statement of the principle of conservation of momentum?

• A force is equal to the rate of chnage of momentum of the object upon which it acts

• In a oerfectly elastic collision, the relative momentum of the objects before impact is equal to their relative momentum after impact

• The mometum of an object is the product of the mass of the object and its velocity

• The total momentum of a system of interacting objects remais constant, providing no resultant force acts on the system

How can the acceleration of an object be determined?

• from the area under a displacement–time graph
• from the area under a velocity–time graph
• from the gradient of a displacement–time graph
• from the gradient of a velocity–time graph

When must an object be in equilibrium?

• When no resultant force acts on the object
• When no resultant force and no resultant torque act on the object
• When no resultant torque acts on the object
• When the upward force on the object is equal and opposite to its weight

Which physical quantity could have units of N s^2 m^-1

• acceleration

• force

• mass

• momentum

A cannon fires a cannonball with an initial speed v at an angle α to the horizontal. Which equation is correct for the maximum height H reached?

• 
• 
• 
• 

Which quantity is a scalar?

• acceleration
• force
• kinetic energy
• momentum