Chapter 2

When a rock thrown straight up reaches the exact top of its path, its velocity is...

zero and it's acceleration is 10m/s2

A tow truck exerts a force of 3000 N on a car that accelerates at 2 m/s2. The mass of the car must be...

1500kg

A karate chop breaks a board with a blow of 3000 N. The force that acts on the hand during this event is...

3000 N

The force that directly propels a motor scooter along a highway is that provided by the...

Road

A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration?

a=F/m = 3.0 m/s2

If an object's mass decreases while a constant force acts on it, the acceleration...

increases

Part complete A 1-kg ball is thrown straight up at 10 m/s. Neglecting air resistance, the net force that acts on the ball when it is half way to the top of its path is...

10 N

Part one: If you stand next to a wall on a frictionless skateboard and push the wall with a force of 48 N , how hard does the wall push on you?

48 N

A person is attracted toward the center of Earth by a 500-N gravitational force. The force of attraction of Earth toward the person is

500 N

A 10-N falling object encounters 4 N of air resistance. The net force on it is...

6 N

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

Acceleration

A given net force propels an object along a straight-line path by a force. If the mass were doubled, its acceleration would...

Be half

Part two: If your mass is 80 kg , find your acceleration.

F=ma (48 N)/(80kg) = 0.60ms2

A car has a mass of 1000 kg and accelerates at 2 m/s2. What is the magnitude of the force exerted on the car?

F=ma =2000 N

Newton's Laws

First: Inertia, Second: Acceleration, Third: Action-Reaction