Worksheets8th Grade Science Final
Total questions: 24
Worksheet time: 36mins
The _________ of an object describes the speed and the direction in which it is going.
Velocity
Acceleration
Force
Energy
The change in velocity of an object is defined as its ___________________.
Speed
Acceleration
Force
Momentum
An object that is traveling around another body in space in __________________ around the body.
Orbit
Free Fall
Rest
Motion
The _________________ on an object is the combination of all the force acting on the object.
Net Force
Frictional Force
Tension Force
Gravitational Force
_________________ is the use of force to move an object in the direction of the force.
Work
Power
Energy
Motion
The stored energy that an object has due to the position, condition, or chemical composition is called _______________________.
Potential Energy
Kinetic Energy
Mechanical Energy
Thermal Energy
A(n) ___________________ is a device that helps people do work by changing the way work is done.
Machine
Tool
Equipment
Instrument
A machine's ________________ is the ratio of the machine's output force to its input force.
Efficiency
Mechanical Advantage
Velocity Ratio
Frictional Force
A(n) ________________ is a simple machine that consists of a solid bar that pivots at a fixed point.
Lever
Pulley
Wheel and Axle
Inclined Plane
An airplane leaves New York to fly to Los Angeles. It travels 3.850 km in 5.5 hours. What is the average speed of the airplane?
700 km
700 km/hour
700 hours
700 hours/km
The law of universal gravitation says all bodies attract each other. If you drop a cup, it falls to Earth. Why doesn't the gravitational attraction between your hand and cup keep the cup from falling?
The law of universal gravitation only applies to planets in space.
There is a gravitational attraction between you and the cup, but Earth's gravity is stronger, so Earth's gravity pulls the cup down.
The gravitational attraction between you and the cup is so strong that the force pushes the cup down.
There is no gravitational attraction between you and the cup, so Earth's gravity pulls the cup down.
The diagram below shows the forces acting on a sneaker. As the force F is applied, the sneaker does not move. Which statement below correctly describes the forces?
The net force is acting in an upward direction.
The net force is acting to the left.
The net force is acting to the right.
The net force is zero and all the forces are balanced.
The diagram below shows a satellite in orbit around Earth. It is orbiting in the direction shown and is pulled toward Earth by gravity. What would happen if Earth's gravity suddenly disappeared?
The satellite would continue to orbit Earth.
The satellite would fall to the Earth.
The satellite would move into space in a straight line.
The satellite would stop moving.
Julia is in a car with her father. The car is undergoing centripetal acceleration. What is happening to the car?
The car is changing direction at a constant speed.
The car is changing directions and speeding up.
The car is stopping suddenly.
The car is slowing down.
Rajiv made a model of a boat. When he places it in water, it sinks. According to Archimedes' principle, why does the boat sink?
The boat is too small.
The buoyant force is less than the boat's weight.
The buoyant force is equal to the boat's weight.
The buoyant force is greater than the boat's weight.
Mark is trying to push a box of sports equipment across the floor. The arrow on the box is a vector representing the force that Mark exerts. What are the forces acting upon the box?
What does the formula F= ma mean, and which of Newton's three laws does it describe?
Which of the following is an example of the conversion of kinetic energy into gravitational potential energy.
a person parachuting out of an airplane.
a car racing around an oval track.
a person skiing down a hill.
a person walking up a hill.
Which is an example of a wedge?
knife
hammer
ramp
screw
A ramp is an example of which type of simple machine?
a lever
an inclined plane
a wheel and axle
a block and tackle pulley
The diagram below shows a swinging pendulum. During every swing, the pendulum's speed and position change. Three positions during the swing are identified as Position 1, Position 2, Position 3. Ignoring the effects of friction or air resistance, at which point would the pendulum have the greatest amount of mechanical energy?
Position 1
Position 2
Position 3
Position 4
Below is a diagram of a weight on a spring. When the weight is pulled down and then released, the spring compresses and expands. Each position indicates a different point in time. Which of the following statements is true?
In all four positions, mechanical energy is 0 J.
The elastic potential energy of the spring at Position 2 is converted to kinetic energy.
The chemical potential energy of the spring is greatest at Position 4.
In all four positions, the gravitational potential energy of the spring is the same.
All moving objects have kinetic energy. The four vehicles in the diagram below are all moving at the same speed along the road. Which of the following statements is correct?
The motorcycle has the most kinetic energy because it is the vehicle with the least mass.
All the vehicles have the same kinetic energy because they are moving at the same speed.
The delivery truck has the greatest kinetic energy because its mass is greater than that of the other vehicles.
The delivery truck has the greatest kinetic energy because it has the most tires in contact with the pavement.
A faucet is an example of a simple machine, a wheel and axle. The faucet wheel has a radius of 5cm. The axle has a radius of 0.5cm. The input force is applied to the faucet wheel. What is the mechanical advantage of the simple machine?
0.1
1
5
10
