Unit Test — Unit test Answers
Newton’s third law of motion says that for every action there is a(n) and opposite reaction.
A sports car and a minivan run out of gas and are pushed to the side of the road. Which is easier to push, and why?
According to Newton’s first law of motion, what will an object in motion do when no external force acts on it?
How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s2?
A box is sitting on the floor. The box was then pulled with a force, Ft. The box did not move. The free-body diagram of the box is shown.
What is the SI unit for momentum?
A bowling ball has an initial momentum of +30 kg m/s and hits a stationary bowling pin. After the collision, the bowling ball leaves with a momentum of +13 kg • m/s.
John pushes Hector on a plastic toboggan.The free-body diagram is shown.
A train car has a mass of 10,000 kg and is moving at +3.0 m/s. It strikes an identical train car that is at rest. The train cars combine.
What is the mass of an object if a net force of 8.0 N causes it to accelerate at 1.1 m/s2?
Juanita studies several free-body diagrams in which a normal force is shown. What is always true about a normal force in a free-body diagram?
A 0.25 kg baseball is in contact with a bat for 0.0075 s and exerts a force of 18,500 N. What impulse is delivered to the ball?
What is the mass of a crate if a net force of 12 N gives the crate an acceleration of 0.20 m/s2?
Newton’s second law of motion states that the acceleration of an object is proportional to the net force acting on it.
Newton's first law of motion is also called the law of .
Which object is in static equilibrium?
Juan draws a free-body diagram of an object that is in dynamic equilibrium moving to the left.
What is the purpose of a free body diagram?
A baseball has a mass of 145 g. A bat exerts a force of 18,400 N on the ball. What is the acceleration of the ball?
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