PHYS 1010 Quiz #4

The resultant of a 30-N force and a 40-N force cannot possibly be

80 N

If action is a foot kicking a soccer ball, the reaction is an equal force on the

foot

When you jump vertically upward, strictly speaking, you cause Earth to

move downward

A boulder falls due to gravity. The reaction to the force on the boulder is

the boulder pulling up on the earth

Earth pulls on the Moon with a certain force. Relative to this force, the pull of the Moon on Earth is

the same

A mosquito has a collision with the windshield of a massive high-speed truck. The force of impact on the mosquito is______ the force on the truck, and the acceleration of the mosquito is______ the deceleration of the truck.

the same as: more than

A boxer punches a sheet of paper with mass m and brings it from rest up to a speed v in a time t. Find the force our boxer exerted on a paper provided the following values: m = 0.006 kg v = 22 m/s t = 0.07 s

1.89 M x V / T

An axe is swung against a tree with a blow of 4000 N. The force that acts on the axe during this event is

4000 N

You run horizontally at 4 m/s in a vertically falling rain that falls at 4 m/s. Relative to you, the raindrops are falling at an angle of

45 degrees

PP 024 Question 3c No air drag (or friction) is present. Vertical components of velocity at point C compares to that at point A as follows: Keep in mind that word velocity means a vector!

A=B=C

Whenever one object exerts a force on a second object, the second object exerts a force on the first that

Is opposite in direction, occurs at the same time, and is equal in magnitude

PP 025 Question 4 Do velocity vectors combine with force vectors?

No - Never Velocity vectors combine with velocity vectors & force vectors combine with force vectors

When the neck of an air-filled balloon is untied and air escapes, the balloon shoots through the air. The force that propels the balloon is provided by the

ejected air

Two identical carts have a compressed spring between them. When the spring is released, the carts recoil from each other with oppositely directed accelerations that are

equal

Horizontal and vertical components of velocity are equal when the projection angle is

equal to 45 degrees

When a squid pushes against water, the squid moves forward because the water

exerts a net forward force

The net force on a kicked soccer ball can be zero when

it is kicked by two feet with equal and opposite amounts of force

A force is a push or pull that is required to change the

the state of motion of an object

A massive truck and a golf cart have a head-on collision with equal amounts of force. The least amount of acceleration occurs for

the truck

A (real) force interaction requires at least

two forces