Physics Final Exam Review

If no forces are acting on an object, its motion will:

• continue in the same direction with the same speed.

• slow down and eventually stop.

• continue at the same speed but could change direction.

• continue in the same direction but could change speed.

The graph shows the motion of a an object moving in a straight line. From the graph, you may conclude that:

• the object is accelerating at a constant rate of 3.5 m/sec².

• the object is moving from left to right.

• the object is weightless as if it were in outer space.

• the total force acting on the object is zero.

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Which of the following situations can NEVER happen because it represents a violation of Newton’s first law?

• The acceleration of an object is zero even though gravity exerts a force on the object.

• The speed of an object is zero, but the object feels a force and its acceleration is not zero.

• The speed of an object changes even though no forces are acting on the object.

• The speed of an object remains the same even when several forces are acting on the object.

Three forces are acting on an object as shown in the diagram. The object is not moving. Two forces are 2 newtons and 10 newtons. The third force is:

• 8 newtons.

• 10 newtons.

• 12 newtons.

• 20 newtons.

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If the net force is negative and the speed is positive:

• the speed will decrease over time.

• the speed will increase over time.

• the speed will stay the same.

• the speed will immediately drop to zero.

An object is observed to have an acceleration of 2 m/sec² when a net force of 4 newtons is applied. The mass of the object is:

• 0.5 kg

• 1.0 kg

• 2.0 kg

• 8.0 kg

The same engine is placed in a large truck and a small car. The engine produces the same amount of force between the vehicle and the road in both cases. The truck:

• has a greater acceleration than the car because the truck has a greater mass.

• has a smaller acceleration than the car because the truck has a greater mass.

• has the same acceleration as the car because the engine produces the same force.

• has a smaller acceleration than the car because the truck is longer than the car.

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The newton is a unit of force that is defined by:

• the strength of gravity acting on a 1-kilogram object on the Earth’s surface.

• an acceleration of 1 m/sec² of an object with a mass of 1 kilogram.

• a speed of 1 m/sec and an acceleration of 1 m/sec².

• the mass of a 1-kilogram object moving at a speed of 1 m/sec.

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Three forces act on the cart shown in the diagram. The acceleration of the cart is:

• to the left at 1 m/sec²

• to the left at 2 m/sec²

• to the right at 1 m/sec²

• to the right at 2 m/sec²

When you kick a ball, your foot feels the ball because:

• the ball is harder than your foot.

• the ball exerts a force on your foot as a reaction to the force of your foot on the ball.

• the ball accelerates away from your foot.

• your foot is harder than the ball.