WorksheetsChapter 8 Forces in Motion
Total questions: 31
Worksheet time: 23mins
The illustration shows forces acting on a box.
What is the net force on the box if the sliding friction between the box and the floor is 5N?
5N to the left
8N to the right
13N to the right
zero net force
A boat moves forward through water with a force of 5,100 newtons(N). The water resists with forces equaling 4,800N. What is the net force acting on the boat?
300N
4800N
5100N
9900N
Two sailboats are moving as shown in the graph. Which statement is correct based on the data in the graph?
Boat A traveled faster than Boat B.
Boat B traveled faster than Boat A.
Boat A traveled for a longer time than Boat B.
Boat B traveled for a longer time than Boat A.
Newton's first law of motion states that an object at rest will stay at rest unless acted upon by an outside force. Which activity is an example of this law?
A football is kicked off a tee.
A baseball player slides into second base.
A floating stick is carried over a waterfall.
A bicycle travels faster as it goes downfall.
After a storm, a hospital may have to rely on backup generators to power some equipment. Which is the energy conversion provided by the generators?
mechanical energy to electrical energy
thermal energy to mechanical energy
nuclear energy to mechanical energy
thermal energy to electrical energy
Mountain bike tires have large, knob-like treads. These tires are useful on steep slopes because they_______________________.
increase friction
carry heavy weights
increase the stopping distance
prevent braking of the bicycle
Rowing a boat forward requires a force that will overcome friction from water and wind. Which factor MOST helps overcome the forces working against the boat?
the length of the boat
the height of sides of the boat
the weight of the rowers in the boat
the number of people rowing in the boat
Riding a bicycle produces several forms of energy. Which form of energy is produced in the GREATEST amount by pedaling a bicycle down the sidewalk?
chemical
radiant
kinetic
sound
Angela has a toy made out of a coil of wire. She places the toy at the top of some stairs. The toy can travel down each step, end-over-end.
Which type of energy does the toy have when it is placed at the top of the stairs?
electric
kinetic
magnetic
potential
The drawing shows a waterfall flowing into a pool of water. Which statement BEST describes the energy of the objects in the drawing?
The pool of water has more kinetic energy and the falling water has more potential energy.
The falling water has potential energy and the rock which it flows has kinetic energy.
The water has potential energy at the top of the waterfall and increasing kinetic energy as it falls.
The water at the top of the fall has kinetic energy that becomes potential energy as it falls into the pool.
While on a movie set, a stuntman jumps off the roof of a building. As he falls towards an airbag, what is increasing?
gravity
wind velocity
kinetic energy
potential energy
0.02m/s
0.10m/s
0.50 m/s
50.0 m/s
All of the forces acting on a helicopter are balanced. The reduction of which force would cause the helicopter to drop in altitude?
lift
drag
thrust
weight
Thomas watches an orange fall from a tree to the ground. Which BEST describes the flow of energy as the orange falls and hits the ground?
Solar energy->Potential energy->Heat energy
Potential energy->Sound energy->Heat energy
Kinetic energy->Potential energy->Sound energy
Potential energy->Kinetic energy->Sound energy
At what point does Myra have the MOST potential energy?
1
2
3
4
Rodger pushes his skateboard across a sidewalk. If the sidewalk is level, which would MOST likely make the skateboard lose its kinetic energy?
friction
heat
magnetism
temperature
In a tug-of-war game, balanced forces are BEST represented when both teams cause the flag to _____________________.
stay in the middle
fall to the ground
move slowly in one direction
be pulled quickly in one direction
A student plans to build a model roller coaster for a science fair. The only energy for the car is the potential energy it contains. The students wants the car to roll from Point 1 to Point 2. Which design allows the car to roll to Point 2 by converting its potential energy into kinetic energy?
What is one way land helps reduce the force of a hurricane as it moves inland?
Land filters the water forced up from the sea by the wind.
Land acts as a bumpy surfaces that absorbs wind power.
Land stabilizes the sediment forced on shore.
Land absorbs the rainwater.
Machines are often full of moving parts that rub against each other. In machines, a lubricant such as oil is often applied to these moving parts. Why is this oil necessary?
to enhance the effectiveness of friction
to increase the efficiency of the machine
to provide an additional source of energy
to produce more thermal energy on the machine
Isaac Newton discovered the three laws of motion. Which example BEST illustrates Newton's third law of motion, which describes action and reaction forces?
a rocket takes off from the ground
a book slides forward on a seat when the car stops
a heavier ball falls at the same speed as a lighter ball
a vehicle rounds a curve and changes its acceleration
A student pushes on an object with a force of 6 Newtons and the new object does not move. What force does the object exert on the student's hands?
0N
3N
6N
12N
Which of these is an example of Newton's First Law of Motion?
A basketball hit with a baseball travels faster than a bowling ball hit with the same force.
A basketball bounces on the ground with the same force that the ground pushes up on the ball.
A person jumps to a dock from a boat, and the boat moves away from the dock.
A person standing on a bus moves backward when the bus suddenly moves forward.
Sir Isaac Newton stated that every object in the universe attracts matter. The attraction depends on the mass of an object and the distance between the objects. What type of force did Newton describe?
centripetal force
generalized force
centrifugal force
gravitational force
The table represents the data from an experiment to determine the speed of a toy car on a straight track. The car is moving at a constant speed in a forward direction. Which value belongs in the cell marked with and x ?
Time (seconds) Distance (centimeters)
1 - 50
4 - 200
5 - 250
8 - x
12 - 600
300
350
400
450
When the two forces are applied to the moving bus, the bus will _____.
come to a complete stop because of unbalanced forces
accelerate because of unbalanced forces
slow down because the forces are balances
move at a constant speed because the forces are balanced
Some race cars are equipped with parachutes to help bring the car to a stop. Which MOST likely causes the change in the velocity of the race car?
a balanced force exerted by the parachute
an increase in the force exerted by the car
a net force of zero between the car and parachute
an unbalanced force between the car and parachute
Don throws a ball in the air. The ball comes back to the ground because ___________________________.
the wind pushes on the ball with friction
the mass of Earth creates a pull of gravity on the ball
the core of Earth pulls on the ball with a magnetic attraction
the weight of the atmosphere pushes down on the ball
Roberto is sliding down a plastic slide on the playground. After he reaches the ground, he feels a small electric shock when he touches a piece of metal. What has been built up on his body that causes the shock?
atoms
electrons
neutrons
protons
In which of the following cases would a decrease in friction be MOST beneficial?
the friction between the shoes of a jogger and the jogging track
the friction between the wheels of a car and the surface of a road
the friction between a rotating pulley and the axle that supports the pulley
the friction between a rotating pulley and the rope that is used with the pulley
When the roller coaster rolls onto a flat section of track, what force would ultimately bring it to a stop if no other forces are added?
gravity
weight
friction
acceleration
