Wk3 quiz 4

A 10N falling object encounters 10N of air resistance. The net force on the object is

0N

As the skydiver continues to fall faster and faster through the air,

Net force and acceleration decrease

When a space shuttle travels in a circular orbit around Earth, is force required to maintain its high speed?

No, shuttle coasts by its own inertia

The car is pushed in undergoes a certain acceleration. Consider how the acceleration would compare if it were pushed with twice the net force but it's mass increased by four. Then it's acceleration would be

One-half

And a free falling objects only a single force acts

Only a single force acts

An apple weighing 1N is held at rest above your head, the net force on the apple is zero. Why?

Support force = weight of the object

The force that allows you to walk is

The friction force of the floor on your feet And The reaction force of your foot against the floor

An object weighs 30 N on Earth. A second object weighs 30 N on the jupiter. Which has the smaller mass?

The one on Jupiter

As a ball falls, the action force is the pull of earths mass on the ball. The reaction force is

The pull of the balls mass on earth

A force of 1N accelerates a mass of 1kg at the rate of 1m/s^2. The acceleration of a mass of 2kg acted upon by a force of 2N is

The same

The newton is a unit of

Weight and force

If the mass of an object does not change, a constant net force on the object produces constant

acceleration

If an object falls with constant acceleration, the velocity of the object must

continually change by the same amount each second

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

follow a straight-line path

velocity is a ___________________ quantity

vector

A ball is set in motion across a frozen pond. Neglecting resistance, the force required to keep the ball sliding at constant velocity is

0 N

What is the magnitude of the net force on an object under free-fall? Given the mass of the object is 1kg

10N

A car has a mass of 1000 kg and accelerates at 0.2m/s^2. What is the magnitude of the force exerted on the car?

200N

The weight of 0.6 kg of steak is about

6.0 N

Which object undergoes the greatest impulse if all the baseballs have the same speed just before being caught and just after being thrown

A baseball that is caught and then thrown back.

A Mack truck and a Volkswagen traveling at the same speed have a head-on collision.

Both will exert the same force on each other, and Volkswagen undergoes the greatest change in velocity

If an object falls within constant acceleration, the velocity of the object must

Continually change by the same amount each second

Earth pulls on the moon. Similarly the moon pulls on Earth, evidence that

Earth and Moon are pulling on each other and Earth's and Moon's pulls comprise an action-reaction pair of forces.

An object is propelled along a straight line path by a force. If the net force were reduced to one-half, it's acceleration would

Halved

Due to _______ an object maintains its state of motion

Inertia

If an object follows a straight line path at a constant speed in space

It has zero acceleration

A sheet of tablecloth can be withdrawn from under a container of juice without toppling it if the tablecloth is jerked quickly. This best demonstrates

Juice container has inertia

Moon's gravity is much less than the earth's gravity; still it is just as hard to push and object on the moon as it is to push the same object on earth this is because the

Mass of the object is independent of gravity

The force exerted on the tires of a car to directly accelerate it along the road is exerted by

road

Consider a heavy and a light person jumping together with same-size parachutes from the same altitude. Who will reach the ground first?

the heavy person