COnservation of momentum and impulse

The impulse-momentum theorem states that

• Athe impulse on an object is less than the change in momentum it causes

• the impulse on an object is greater than the change in momentum it causes 

• the impulse on an object is equal to the change in momentum it causes 

• the force on a moving object is equal to the magnitude of the impulse.

. A 40-kilogram mass is moving across a horizontal surface at 5.0 m/s.  What is the magnitude of the net force required to bring the mass to a stop in 8.0 seconds?

• 1 N

• 40 N

• 25 N

• 5 N

A runner has a momentum of 670 kg m/s and is travelling at a velocity of 9 m/s. What is his mass?

• 6030 kg

• 0,0134 kg

• 74,4 kg

• 80 kg

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.

Calculate the impulse on the ball.

• 1 N·s

• 6 N·s

• None of these

• 66 N·s

he difference between a car hitting a wall vs. a car hitting a hay stack is

• the change in momentum of the car hitting the wall is greater

• the force on the car hitting the hay stack is greater

• the Impulse on the car hitting the wall is greater

• the collision time of the car hitting the hay stack is greater

Which takes more force  to catch, a bowling ball or a ping pong ball?

• bowling ball because it has more momentum

• bowling ball because it has less momentum

• both require the same amount of force when catching

• ping pong ball because it has more momentum

A 5 N force is applied to a 3 kg ball to slow it down from 9 m/s to 3 m/s. What is the impulse on the ball?

• -18 N⋅s

• -10 N⋅s

• -45 N⋅s

• -2.5 N⋅s

A moderate force will break an egg. However, an egg dropped on the road usually breaks, while one dropped on the grass usually does not break. This is because for the egg dropped on the grass

• the change in momentum is greater.

• the change in momentum is less.

• the time interval for stopping is greater.

• the time interval for stopping is less.

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.

Calculate the impulse on the ball.

• 1 N·s

• 6 N·s

• None of these

• 66 N·s

In this type of collision, objects tend to "stick" together.

• elastic
• inelastic 
• recoil